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Add probe for clearenv (), like #25733 for unsetenv ()
[perl5.git] / Porting / Glossary
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1
2!!!!!!! DO NOT EDIT THIS FILE !!!!!!!
3This file is built by metaconfig.
4
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5This file contains a description of all the shell variables whose value is
6determined by the Configure script. Variables intended for use in C
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7programs (e.g. I_UNISTD) are already described in config_h.SH. [`configpm'
8generates pod documentation for Config.pm from this file--please try to keep
24412007 9the formatting regular.]
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781b178c 11_a (Unix.U):
9285ede2 12 This variable defines the extension used for ordinary library files.
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13 For unix, it is '.a'. The '.' is included. Other possible
14 values include '.lib'.
15
16_exe (Unix.U):
17 This variable defines the extension used for executable files.
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18 DJGPP, Cygwin and OS/2 use '.exe'. Stratus VOS uses '.pm'.
19 On operating systems which do not require a specific extension
20 for executable files, this variable is empty.
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21
22_o (Unix.U):
23 This variable defines the extension used for object files.
24 For unix, it is '.o'. The '.' is included. Other possible
25 values include '.obj'.
26
27afs (afs.U):
28 This variable is set to 'true' if AFS (Andrew File System) is used
29 on the system, 'false' otherwise. It is possible to override this
30 with a hint value or command line option, but you'd better know
31 what you are doing.
32
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33afsroot (afs.U):
34 This variable is by default set to '/afs'. In the unlikely case
35 this is not the correct root, it is possible to override this with
36 a hint value or command line option. This will be used in subsequent
37 tests for AFSness in the Perl configure and test process.
38
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39alignbytes (alignbytes.U):
40 This variable holds the number of bytes required to align a
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41 double-- or a long double when applicable. Usual values are
42 2, 4 and 8. The default is eight, for safety.
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43
44ansi2knr (ansi2knr.U):
45 This variable is set if the user needs to run ansi2knr.
46 Currently, this is not supported, so we just abort.
47
48aphostname (d_gethname.U):
49 This variable contains the command which can be used to compute the
50 host name. The command is fully qualified by its absolute path, to make
51 it safe when used by a process with super-user privileges.
52
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53api_revision (patchlevel.U):
54 The three variables, api_revision, api_version, and
55 api_subversion, specify the version of the oldest perl binary
56 compatible with the present perl. In a full version string
57 such as '5.6.1', api_revision is the '5'.
58 Prior to 5.5.640, the format was a floating point number,
59 like 5.00563.
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60
61 perl.c:incpush() and lib/lib.pm will automatically search in
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62 $sitelib/.. for older directories back to the limit specified
63 by these api_ variables. This is only useful if you have a
64 perl library directory tree structured like the default one.
65 See INSTALL for how this works. The versioned site_perl
66 directory was introduced in 5.005, so that is the lowest
67 possible value. The version list appropriate for the current
68 system is determined in inc_version_list.U.
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69
70 XXX To do: Since compatibility can depend on compile time
08e5223a 71 options (such as bincompat, longlong, etc.) it should
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72 (perhaps) be set by Configure, but currently it isn't.
73 Currently, we read a hard-wired value from patchlevel.h.
74 Perhaps what we ought to do is take the hard-wired value from
75 patchlevel.h but then modify it if the current Configure
76 options warrant. patchlevel.h then would use an #ifdef guard.
77
78api_subversion (patchlevel.U):
79 The three variables, api_revision, api_version, and
80 api_subversion, specify the version of the oldest perl binary
81 compatible with the present perl. In a full version string
82 such as '5.6.1', api_subversion is the '1'. See api_revision for
83 full details.
84
85api_version (patchlevel.U):
86 The three variables, api_revision, api_version, and
87 api_subversion, specify the version of the oldest perl binary
88 compatible with the present perl. In a full version string
89 such as '5.6.1', api_version is the '6'. See api_revision for
90 full details. As a special case, 5.5.0 is rendered in the
91 old-style as 5.005. (In the 5.005_0x maintenance series,
92 this was the only versioned directory in $sitelib.)
93
94api_versionstring (patchlevel.U):
95 This variable combines api_revision, api_version, and
96 api_subversion in a format such as 5.6.1 (or 5_6_1) suitable
97 for use as a directory name. This is filesystem dependent.
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98
99ar (Loc.U):
5bf26616 100 This variable is used internally by Configure to determine the
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101 full pathname (if any) of the ar program. After Configure runs,
102 the value is reset to a plain "ar" and is not useful.
103
104archlib (archlib.U):
105 This variable holds the name of the directory in which the user wants
106 to put architecture-dependent public library files for $package.
107 It is most often a local directory such as /usr/local/lib.
108 Programs using this variable must be prepared to deal
109 with filename expansion.
110
111archlibexp (archlib.U):
112 This variable is the same as the archlib variable, but is
113 filename expanded at configuration time, for convenient use.
114
115archname64 (use64bits.U):
116 This variable is used for the 64-bitness part of $archname.
117
118archname (archname.U):
119 This variable is a short name to characterize the current
120 architecture. It is used mainly to construct the default archlib.
121
122archobjs (Unix.U):
123 This variable defines any additional objects that must be linked
124 in with the program on this architecture. On unix, it is usually
125 empty. It is typically used to include emulations of unix calls
126 or other facilities. For perl on OS/2, for example, this would
127 include os2/os2.obj.
128
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129asctime_r_proto (d_asctime_r.U):
130 This variable encodes the prototype of asctime_r.
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131 It is zero if d_asctime_r is undef, and one of the
132 REENTRANT_PROTO_T_ABC macros of reentr.h if d_asctime_r
133 is defined.
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781b178c 135awk (Loc.U):
5bf26616 136 This variable is used internally by Configure to determine the
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137 full pathname (if any) of the awk program. After Configure runs,
138 the value is reset to a plain "awk" and is not useful.
139
140baserev (baserev.U):
141 The base revision level of this package, from the .package file.
142
143bash (Loc.U):
144 This variable is defined but not used by Configure.
145 The value is a plain '' and is not useful.
146
147bin (bin.U):
148 This variable holds the name of the directory in which the user wants
149 to put publicly executable images for the package in question. It
150 is most often a local directory such as /usr/local/bin. Programs using
151 this variable must be prepared to deal with ~name substitution.
152
153binexp (bin.U):
154 This is the same as the bin variable, but is filename expanded at
155 configuration time, for use in your makefiles.
156
157bison (Loc.U):
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158 This variable is used internally by Configure to determine the
159 full pathname (if any) of the bison program. After Configure runs,
160 the value is reset to a plain "bison" and is not useful.
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161
162byacc (Loc.U):
5bf26616 163 This variable is used internally by Configure to determine the
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164 full pathname (if any) of the byacc program. After Configure runs,
165 the value is reset to a plain "byacc" and is not useful.
166
167byteorder (byteorder.U):
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168 This variable holds the byte order in a UV. In the following,
169 larger digits indicate more significance. The variable byteorder
170 is either 4321 on a big-endian machine, or 1234 on a little-endian,
171 or 87654321 on a Cray ... or 3412 with weird order !
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172
173c (n.U):
174 This variable contains the \c string if that is what causes the echo
175 command to suppress newline. Otherwise it is null. Correct usage is
176 $echo $n "prompt for a question: $c".
177
178castflags (d_castneg.U):
179 This variable contains a flag that precise difficulties the
180 compiler has casting odd floating values to unsigned long:
181 0 = ok
182 1 = couldn't cast < 0
183 2 = couldn't cast >= 0x80000000
184 4 = couldn't cast in argument expression list
185
186cat (Loc.U):
5bf26616 187 This variable is used internally by Configure to determine the
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188 full pathname (if any) of the cat program. After Configure runs,
189 the value is reset to a plain "cat" and is not useful.
190
191cc (cc.U):
192 This variable holds the name of a command to execute a C compiler which
193 can resolve multiple global references that happen to have the same
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194 name. Usual values are 'cc' and 'gcc'.
195 Fervent ANSI compilers may be called 'c89'. AIX has xlc.
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196
197cccdlflags (dlsrc.U):
198 This variable contains any special flags that might need to be
199 passed with 'cc -c' to compile modules to be used to create a shared
200 library that will be used for dynamic loading. For hpux, this
201 should be +z. It is up to the makefile to use it.
202
203ccdlflags (dlsrc.U):
204 This variable contains any special flags that might need to be
205 passed to cc to link with a shared library for dynamic loading.
206 It is up to the makefile to use it. For sunos 4.1, it should
207 be empty.
208
209ccflags (ccflags.U):
210 This variable contains any additional C compiler flags desired by
211 the user. It is up to the Makefile to use this.
212
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213ccflags_uselargefiles (uselfs.U):
214 This variable contains the compiler flags needed by large file builds
215 and added to ccflags by hints files.
216
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217ccname (Checkcc.U):
218 This can set either by hints files or by Configure. If using
219 gcc, this is gcc, and if not, usually equal to cc, unimpressive, no?
220 Some platforms, however, make good use of this by storing the
221 flavor of the C compiler being used here. For example if using
222 the Sun WorkShop suite, ccname will be 'workshop'.
223
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224ccsymbols (Cppsym.U):
225 The variable contains the symbols defined by the C compiler alone.
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226 The symbols defined by cpp or by cc when it calls cpp are not in
227 this list, see cppsymbols and cppccsymbols.
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228 The list is a space-separated list of symbol=value tokens.
229
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230ccversion (Checkcc.U):
231 This can set either by hints files or by Configure. If using
232 a (non-gcc) vendor cc, this variable may contain a version for
233 the compiler.
234
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235cf_by (cf_who.U):
236 Login name of the person who ran the Configure script and answered the
237 questions. This is used to tag both config.sh and config_h.SH.
238
239cf_email (cf_email.U):
240 Electronic mail address of the person who ran Configure. This can be
241 used by units that require the user's e-mail, like MailList.U.
242
243cf_time (cf_who.U):
244 Holds the output of the "date" command when the configuration file was
245 produced. This is used to tag both config.sh and config_h.SH.
246
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247charsize (charsize.U):
248 This variable contains the value of the CHARSIZE symbol, which
249 indicates to the C program how many bytes there are in a character.
250
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251chgrp (Loc.U):
252 This variable is defined but not used by Configure.
253 The value is a plain '' and is not useful.
254
255chmod (Loc.U):
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256 This variable is used internally by Configure to determine the
257 full pathname (if any) of the chmod program. After Configure runs,
258 the value is reset to a plain "chmod" and is not useful.
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259
260chown (Loc.U):
261 This variable is defined but not used by Configure.
262 The value is a plain '' and is not useful.
263
264clocktype (d_times.U):
265 This variable holds the type returned by times(). It can be long,
266 or clock_t on BSD sites (in which case <sys/types.h> should be
267 included).
268
269comm (Loc.U):
5bf26616 270 This variable is used internally by Configure to determine the
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271 full pathname (if any) of the comm program. After Configure runs,
272 the value is reset to a plain "comm" and is not useful.
273
274compress (Loc.U):
275 This variable is defined but not used by Configure.
276 The value is a plain '' and is not useful.
277
278contains (contains.U):
279 This variable holds the command to do a grep with a proper return
280 status. On most sane systems it is simply "grep". On insane systems
281 it is a grep followed by a cat followed by a test. This variable
282 is primarily for the use of other Configure units.
283
284cp (Loc.U):
5bf26616 285 This variable is used internally by Configure to determine the
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286 full pathname (if any) of the cp program. After Configure runs,
287 the value is reset to a plain "cp" and is not useful.
288
289cpio (Loc.U):
290 This variable is defined but not used by Configure.
291 The value is a plain '' and is not useful.
292
293cpp (Loc.U):
5bf26616 294 This variable is used internally by Configure to determine the
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295 full pathname (if any) of the cpp program. After Configure runs,
296 the value is reset to a plain "cpp" and is not useful.
297
298cpp_stuff (cpp_stuff.U):
505656d3 299 This variable contains an identification of the concatenation mechanism
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300 used by the C preprocessor.
301
302cppccsymbols (Cppsym.U):
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303 The variable contains the symbols defined by the C compiler
304 when it calls cpp. The symbols defined by the cc alone or cpp
305 alone are not in this list, see ccsymbols and cppsymbols.
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306 The list is a space-separated list of symbol=value tokens.
307
308cppflags (ccflags.U):
309 This variable holds the flags that will be passed to the C pre-
310 processor. It is up to the Makefile to use it.
311
312cpplast (cppstdin.U):
313 This variable has the same functionality as cppminus, only it applies
314 to cpprun and not cppstdin.
315
316cppminus (cppstdin.U):
317 This variable contains the second part of the string which will invoke
318 the C preprocessor on the standard input and produce to standard
319 output. This variable will have the value "-" if cppstdin needs
320 a minus to specify standard input, otherwise the value is "".
321
322cpprun (cppstdin.U):
323 This variable contains the command which will invoke a C preprocessor
324 on standard input and put the output to stdout. It is guaranteed not
325 to be a wrapper and may be a null string if no preprocessor can be
326 made directly available. This preprocessor might be different from the
327 one used by the C compiler. Don't forget to append cpplast after the
328 preprocessor options.
329
330cppstdin (cppstdin.U):
331 This variable contains the command which will invoke the C
332 preprocessor on standard input and put the output to stdout.
333 It is primarily used by other Configure units that ask about
334 preprocessor symbols.
335
336cppsymbols (Cppsym.U):
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337 The variable contains the symbols defined by the C preprocessor
338 alone. The symbols defined by cc or by cc when it calls cpp are
339 not in this list, see ccsymbols and cppccsymbols.
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340 The list is a space-separated list of symbol=value tokens.
341
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342crypt_r_proto (d_crypt_r.U):
343 This variable encodes the prototype of crypt_r.
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344 It is zero if d_crypt_r is undef, and one of the
345 REENTRANT_PROTO_T_ABC macros of reentr.h if d_crypt_r
346 is defined.
10bc17b6 347
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348cryptlib (d_crypt.U):
349 This variable holds -lcrypt or the path to a libcrypt.a archive if
350 the crypt() function is not defined in the standard C library. It is
351 up to the Makefile to use this.
352
353csh (Loc.U):
5bf26616 354 This variable is used internally by Configure to determine the
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355 full pathname (if any) of the csh program. After Configure runs,
356 the value is reset to a plain "csh" and is not useful.
357
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358ctermid_r_proto (d_ctermid_r.U):
359 This variable encodes the prototype of ctermid_r.
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360 It is zero if d_ctermid_r is undef, and one of the
361 REENTRANT_PROTO_T_ABC macros of reentr.h if d_ctermid_r
362 is defined.
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363
364ctime_r_proto (d_ctime_r.U):
365 This variable encodes the prototype of ctime_r.
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366 It is zero if d_ctime_r is undef, and one of the
367 REENTRANT_PROTO_T_ABC macros of reentr.h if d_ctime_r
368 is defined.
10bc17b6 369
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370d__fwalk (d__fwalk.U):
371 This variable conditionally defines HAS__FWALK if _fwalk() is
372 available to apply a function to all the file handles.
373
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374d_access (d_access.U):
375 This variable conditionally defines HAS_ACCESS if the access() system
376 call is available to check for access permissions using real IDs.
377
378d_accessx (d_accessx.U):
379 This variable conditionally defines the HAS_ACCESSX symbol, which
380 indicates to the C program that the accessx() routine is available.
381
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382d_aintl (d_aintl.U):
383 This variable conditionally defines the HAS_AINTL symbol, which
384 indicates to the C program that the aintl() routine is available.
385 If copysignl is also present we can emulate modfl.
386
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387d_alarm (d_alarm.U):
388 This variable conditionally defines the HAS_ALARM symbol, which
389 indicates to the C program that the alarm() routine is available.
390
391d_archlib (archlib.U):
392 This variable conditionally defines ARCHLIB to hold the pathname
393 of architecture-dependent library files for $package. If
394 $archlib is the same as $privlib, then this is set to undef.
395
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396d_asctime_r (d_asctime_r.U):
397 This variable conditionally defines the HAS_ASCTIME_R symbol,
398 which indicates to the C program that the asctime_r()
399 routine is available.
400
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401d_atolf (atolf.U):
402 This variable conditionally defines the HAS_ATOLF symbol, which
403 indicates to the C program that the atolf() routine is available.
404
405d_atoll (atoll.U):
406 This variable conditionally defines the HAS_ATOLL symbol, which
407 indicates to the C program that the atoll() routine is available.
408
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409d_attribute_format (d_attribut_format.U):
410 This variable conditionally defines HASATTRIBUTE_FORMAT, which
411 indicates the C compiler can check for printf-like formats.
412
413d_attribute_malloc (d_attribute_malloc.U):
414 This variable conditionally defines HASATTRIBUTE_MALLOC, which
415 indicates the C compiler can understand functions as having
416 malloc-like semantics.
417
418d_attribute_nonnull (d_attribute_nonnull.U):
419 This variable conditionally defines HASATTRIBUTE_NONNULL, which
420 indicates that the C compiler can know that certain arguments
421 must not be NULL, and will check accordingly at compile time.
422
423d_attribute_noreturn (d_attribute_noreturn.U):
424 This variable conditionally defines HASATTRIBUTE_NORETURN, which
425 indicates that the C compiler can know that certain functions
426 are guaranteed never to return.
427
428d_attribute_pure (d_attribute_pure.U):
429 This variable conditionally defines HASATTRIBUTE_PURE, which
430 indicates that the C compiler can know that certain functions
431 are "pure" functions, meaning that they have no side effects, and
432 only rely on function input and/or global data for their results.
433
434d_attribute_unused (d_attribute_unused.U):
435 This variable conditionally defines HASATTRIBUTE_UNUSED, which
436 indicates that the C compiler can know that certain variables
437 and arguments may not always be used, and to not throw warnings
438 if they don't get used.
439
440d_attribute_warn_unused_result (d_attribute_warn_unused_result.U):
441 This variable conditionally defines
442 HASATTRIBUTE_WARN_UNUSED_RESULT, which indicates that the C
443 compiler can know that certain functions have a return values
444 that must not be ignored, such as malloc() or open().
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445
446d_bcmp (d_bcmp.U):
447 This variable conditionally defines the HAS_BCMP symbol if
448 the bcmp() routine is available to compare strings.
449
450d_bcopy (d_bcopy.U):
451 This variable conditionally defines the HAS_BCOPY symbol if
452 the bcopy() routine is available to copy strings.
453
454d_bsd (Guess.U):
455 This symbol conditionally defines the symbol BSD when running on a
456 BSD system.
457
458d_bsdgetpgrp (d_getpgrp.U):
459 This variable conditionally defines USE_BSD_GETPGRP if
460 getpgrp needs one arguments whereas USG one needs none.
461
462d_bsdsetpgrp (d_setpgrp.U):
463 This variable conditionally defines USE_BSD_SETPGRP if
464 setpgrp needs two arguments whereas USG one needs none.
465 See also d_setpgid for a POSIX interface.
466
467d_bzero (d_bzero.U):
468 This variable conditionally defines the HAS_BZERO symbol if
469 the bzero() routine is available to set memory to 0.
470
471d_casti32 (d_casti32.U):
472 This variable conditionally defines CASTI32, which indicates
473 whether the C compiler can cast large floats to 32-bit ints.
474
475d_castneg (d_castneg.U):
476 This variable conditionally defines CASTNEG, which indicates
477 wether the C compiler can cast negative float to unsigned.
478
479d_charvspr (d_vprintf.U):
480 This variable conditionally defines CHARVSPRINTF if this system
481 has vsprintf returning type (char*). The trend seems to be to
482 declare it as "int vsprintf()".
483
484d_chown (d_chown.U):
485 This variable conditionally defines the HAS_CHOWN symbol, which
486 indicates to the C program that the chown() routine is available.
487
488d_chroot (d_chroot.U):
489 This variable conditionally defines the HAS_CHROOT symbol, which
490 indicates to the C program that the chroot() routine is available.
491
492d_chsize (d_chsize.U):
493 This variable conditionally defines the CHSIZE symbol, which
494 indicates to the C program that the chsize() routine is available
495 to truncate files. You might need a -lx to get this routine.
496
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497d_class (d_class.U):
498 This variable conditionally defines the HAS_CLASS symbol, which
499 indicates to the C program that the class() routine is available.
500
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501d_clearenv (d_clearenv.U):
502 This variable conditionally defines the HAS_CLEARENV symbol, which
503 indicates to the C program that the clearenv () routine is available.
504
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505d_closedir (d_closedir.U):
506 This variable conditionally defines HAS_CLOSEDIR if closedir() is
507 available.
508
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509d_cmsghdr_s (d_cmsghdr_s.U):
510 This variable conditionally defines the HAS_STRUCT_CMSGHDR symbol,
511 which indicates that the struct cmsghdr is supported.
512
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513d_const (d_const.U):
514 This variable conditionally defines the HASCONST symbol, which
515 indicates to the C program that this C compiler knows about the
516 const type.
517
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518d_copysignl (d_copysignl.U):
519 This variable conditionally defines the HAS_COPYSIGNL symbol, which
520 indicates to the C program that the copysignl() routine is available.
521 If aintl is also present we can emulate modfl.
522
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523d_crypt (d_crypt.U):
524 This variable conditionally defines the CRYPT symbol, which
525 indicates to the C program that the crypt() routine is available
526 to encrypt passwords and the like.
527
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528d_crypt_r (d_crypt_r.U):
529 This variable conditionally defines the HAS_CRYPT_R symbol,
530 which indicates to the C program that the crypt_r()
531 routine is available.
532
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533d_csh (d_csh.U):
534 This variable conditionally defines the CSH symbol, which
535 indicates to the C program that the C-shell exists.
536
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537d_ctermid_r (d_ctermid_r.U):
538 This variable conditionally defines the HAS_CTERMID_R symbol,
539 which indicates to the C program that the ctermid_r()
540 routine is available.
541
542d_ctime_r (d_ctime_r.U):
543 This variable conditionally defines the HAS_CTIME_R symbol,
544 which indicates to the C program that the ctime_r()
545 routine is available.
546
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547d_cuserid (d_cuserid.U):
548 This variable conditionally defines the HAS_CUSERID symbol, which
549 indicates to the C program that the cuserid() routine is available
550 to get character login names.
551
552d_dbl_dig (d_dbl_dig.U):
553 This variable conditionally defines d_dbl_dig if this system's
554 header files provide DBL_DIG, which is the number of significant
555 digits in a double precision number.
556
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557d_dbminitproto (d_dbminitproto.U):
558 This variable conditionally defines the HAS_DBMINIT_PROTO symbol,
559 which indicates to the C program that the system provides
560 a prototype for the dbminit() function. Otherwise, it is
561 up to the program to supply one.
562
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563d_difftime (d_difftime.U):
564 This variable conditionally defines the HAS_DIFFTIME symbol, which
565 indicates to the C program that the difftime() routine is available.
566
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567d_dirfd (d_dirfd.U):
568 This variable conditionally defines the HAS_DIRFD constant,
569 which indicates to the C program that dirfd() is available
570 to return the file descriptor of a directory stream.
571
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572d_dirnamlen (i_dirent.U):
573 This variable conditionally defines DIRNAMLEN, which indicates
574 to the C program that the length of directory entry names is
575 provided by a d_namelen field.
576
577d_dlerror (d_dlerror.U):
578 This variable conditionally defines the HAS_DLERROR symbol, which
579 indicates to the C program that the dlerror() routine is available.
580
581d_dlopen (d_dlopen.U):
582 This variable conditionally defines the HAS_DLOPEN symbol, which
583 indicates to the C program that the dlopen() routine is available.
584
585d_dlsymun (d_dlsymun.U):
586 This variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which
587 indicates that we need to prepend an underscore to the symbol
588 name before calling dlsym().
589
590d_dosuid (d_dosuid.U):
591 This variable conditionally defines the symbol DOSUID, which
592 tells the C program that it should insert setuid emulation code
593 on hosts which have setuid #! scripts disabled.
594
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595d_drand48_r (d_drand48_r.U):
596 This variable conditionally defines the HAS_DRAND48_R symbol,
597 which indicates to the C program that the drand48_r()
598 routine is available.
599
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600d_drand48proto (d_drand48proto.U):
601 This variable conditionally defines the HAS_DRAND48_PROTO symbol,
602 which indicates to the C program that the system provides
603 a prototype for the drand48() function. Otherwise, it is
604 up to the program to supply one.
605
606d_dup2 (d_dup2.U):
607 This variable conditionally defines HAS_DUP2 if dup2() is
608 available to duplicate file descriptors.
609
610d_eaccess (d_eaccess.U):
611 This variable conditionally defines the HAS_EACCESS symbol, which
612 indicates to the C program that the eaccess() routine is available.
613
614d_endgrent (d_endgrent.U):
615 This variable conditionally defines the HAS_ENDGRENT symbol, which
616 indicates to the C program that the endgrent() routine is available
617 for sequential access of the group database.
618
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619d_endgrent_r (d_endgrent_r.U):
620 This variable conditionally defines the HAS_ENDGRENT_R symbol,
621 which indicates to the C program that the endgrent_r()
622 routine is available.
623
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624d_endhent (d_endhent.U):
625 This variable conditionally defines HAS_ENDHOSTENT if endhostent() is
626 available to close whatever was being used for host queries.
627
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628d_endhostent_r (d_endhostent_r.U):
629 This variable conditionally defines the HAS_ENDHOSTENT_R symbol,
630 which indicates to the C program that the endhostent_r()
631 routine is available.
632
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633d_endnent (d_endnent.U):
634 This variable conditionally defines HAS_ENDNETENT if endnetent() is
635 available to close whatever was being used for network queries.
636
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637d_endnetent_r (d_endnetent_r.U):
638 This variable conditionally defines the HAS_ENDNETENT_R symbol,
639 which indicates to the C program that the endnetent_r()
640 routine is available.
641
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642d_endpent (d_endpent.U):
643 This variable conditionally defines HAS_ENDPROTOENT if endprotoent() is
644 available to close whatever was being used for protocol queries.
645
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646d_endprotoent_r (d_endprotoent_r.U):
647 This variable conditionally defines the HAS_ENDPROTOENT_R symbol,
648 which indicates to the C program that the endprotoent_r()
649 routine is available.
650
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651d_endpwent (d_endpwent.U):
652 This variable conditionally defines the HAS_ENDPWENT symbol, which
653 indicates to the C program that the endpwent() routine is available
654 for sequential access of the passwd database.
655
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656d_endpwent_r (d_endpwent_r.U):
657 This variable conditionally defines the HAS_ENDPWENT_R symbol,
658 which indicates to the C program that the endpwent_r()
659 routine is available.
660
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661d_endsent (d_endsent.U):
662 This variable conditionally defines HAS_ENDSERVENT if endservent() is
663 available to close whatever was being used for service queries.
664
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665d_endservent_r (d_endservent_r.U):
666 This variable conditionally defines the HAS_ENDSERVENT_R symbol,
667 which indicates to the C program that the endservent_r()
668 routine is available.
669
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670d_eofnblk (nblock_io.U):
671 This variable conditionally defines EOF_NONBLOCK if EOF can be seen
672 when reading from a non-blocking I/O source.
673
674d_eunice (Guess.U):
675 This variable conditionally defines the symbols EUNICE and VAX, which
676 alerts the C program that it must deal with ideosyncracies of VMS.
677
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678d_faststdio (d_faststdio.U):
679 This variable conditionally defines the HAS_FAST_STDIO symbol,
680 which indicates to the C program that the "fast stdio" is available
681 to manipulate the stdio buffers directly.
682
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683d_fchdir (d_fchdir.U):
684 This variable conditionally defines the HAS_FCHDIR symbol, which
685 indicates to the C program that the fchdir() routine is available.
686
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687d_fchmod (d_fchmod.U):
688 This variable conditionally defines the HAS_FCHMOD symbol, which
689 indicates to the C program that the fchmod() routine is available
690 to change mode of opened files.
691
692d_fchown (d_fchown.U):
693 This variable conditionally defines the HAS_FCHOWN symbol, which
694 indicates to the C program that the fchown() routine is available
695 to change ownership of opened files.
696
697d_fcntl (d_fcntl.U):
698 This variable conditionally defines the HAS_FCNTL symbol, and indicates
699 whether the fcntl() function exists
700
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701d_fcntl_can_lock (d_fcntl_can_lock.U):
702 This variable conditionally defines the FCNTL_CAN_LOCK symbol
703 and indicates whether file locking with fcntl() works.
704
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705d_fd_macros (d_fd_set.U):
706 This variable contains the eventual value of the HAS_FD_MACROS symbol,
707 which indicates if your C compiler knows about the macros which
708 manipulate an fd_set.
709
710d_fd_set (d_fd_set.U):
711 This variable contains the eventual value of the HAS_FD_SET symbol,
712 which indicates if your C compiler knows about the fd_set typedef.
713
714d_fds_bits (d_fd_set.U):
715 This variable contains the eventual value of the HAS_FDS_BITS symbol,
716 which indicates if your fd_set typedef contains the fds_bits member.
717 If you have an fd_set typedef, but the dweebs who installed it did
718 a half-fast job and neglected to provide the macros to manipulate
719 an fd_set, HAS_FDS_BITS will let us know how to fix the gaffe.
720
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721d_fgetpos (d_fgetpos.U):
722 This variable conditionally defines HAS_FGETPOS if fgetpos() is
723 available to get the file position indicator.
724
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725d_finite (d_finite.U):
726 This variable conditionally defines the HAS_FINITE symbol, which
727 indicates to the C program that the finite() routine is available.
728
729d_finitel (d_finitel.U):
730 This variable conditionally defines the HAS_FINITEL symbol, which
731 indicates to the C program that the finitel() routine is available.
732
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733d_flexfnam (d_flexfnam.U):
734 This variable conditionally defines the FLEXFILENAMES symbol, which
735 indicates that the system supports filenames longer than 14 characters.
736
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737d_flock (d_flock.U):
738 This variable conditionally defines HAS_FLOCK if flock() is
739 available to do file locking.
740
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741d_flockproto (d_flockproto.U):
742 This variable conditionally defines the HAS_FLOCK_PROTO symbol,
743 which indicates to the C program that the system provides
744 a prototype for the flock() function. Otherwise, it is
745 up to the program to supply one.
746
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747d_fork (d_fork.U):
748 This variable conditionally defines the HAS_FORK symbol, which
749 indicates to the C program that the fork() routine is available.
750
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751d_fp_class (d_fp_class.U):
752 This variable conditionally defines the HAS_FP_CLASS symbol, which
753 indicates to the C program that the fp_class() routine is available.
754
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755d_fpathconf (d_pathconf.U):
756 This variable conditionally defines the HAS_FPATHCONF symbol, which
757 indicates to the C program that the pathconf() routine is available
758 to determine file-system related limits and options associated
759 with a given open file descriptor.
760
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761d_fpclass (d_fpclass.U):
762 This variable conditionally defines the HAS_FPCLASS symbol, which
763 indicates to the C program that the fpclass() routine is available.
764
765d_fpclassify (d_fpclassify.U):
766 This variable conditionally defines the HAS_FPCLASSIFY symbol, which
767 indicates to the C program that the fpclassify() routine is available.
768
769d_fpclassl (d_fpclassl.U):
770 This variable conditionally defines the HAS_FPCLASSL symbol, which
771 indicates to the C program that the fpclassl() routine is available.
772
c890dc6c 773d_fpos64_t (d_fpos64_t.U):
ca24dfc6 774 This symbol will be defined if the C compiler supports fpos64_t.
781b178c 775
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776d_frexpl (d_frexpl.U):
777 This variable conditionally defines the HAS_FREXPL symbol, which
778 indicates to the C program that the frexpl() routine is available.
779
ad27e871 780d_fs_data_s (d_fs_data_s.U):
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781 This variable conditionally defines the HAS_STRUCT_FS_DATA symbol,
782 which indicates that the struct fs_data is supported.
783
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784d_fseeko (d_fseeko.U):
785 This variable conditionally defines the HAS_FSEEKO symbol, which
786 indicates to the C program that the fseeko() routine is available.
787
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788d_fsetpos (d_fsetpos.U):
789 This variable conditionally defines HAS_FSETPOS if fsetpos() is
790 available to set the file position indicator.
791
0545a864 792d_fstatfs (d_fstatfs.U):
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793 This variable conditionally defines the HAS_FSTATFS symbol, which
794 indicates to the C program that the fstatfs() routine is available.
795
796d_fstatvfs (d_statvfs.U):
797 This variable conditionally defines the HAS_FSTATVFS symbol, which
798 indicates to the C program that the fstatvfs() routine is available.
799
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800d_fsync (d_fsync.U):
801 This variable conditionally defines the HAS_FSYNC symbol, which
802 indicates to the C program that the fsync() routine is available.
803
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804d_ftello (d_ftello.U):
805 This variable conditionally defines the HAS_FTELLO symbol, which
806 indicates to the C program that the ftello() routine is available.
807
808d_ftime (d_ftime.U):
809 This variable conditionally defines the HAS_FTIME symbol, which indicates
810 that the ftime() routine exists. The ftime() routine is basically
811 a sub-second accuracy clock.
812
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813d_Gconvert (d_gconvert.U):
814 This variable holds what Gconvert is defined as to convert
815 floating point numbers into strings. By default, Configure
816 sets this macro to use the first of gconvert, gcvt, or sprintf
817 that pass sprintf-%g-like behaviour tests. If perl is using
818 long doubles, the macro uses the first of the following
819 functions that pass Configure's tests: qgcvt, sprintf (if
820 Configure knows how to make sprintf format long doubles--see
821 sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).
822 The gconvert_preference and gconvert_ld_preference variables
823 can be used to alter Configure's preferences, for doubles and
824 long doubles, respectively. If present, they contain a
825 space-separated list of one or more of the above function
826 names in the order they should be tried.
827
828 d_Gconvert may be set to override Configure with a platform-
829 specific function. If this function expects a double, a
830 different value may need to be set by the uselongdouble.cbu
831 call-back unit so that long doubles can be formatted without
832 loss of precision.
833
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834d_getcwd (d_getcwd.U):
835 This variable conditionally defines the HAS_GETCWD symbol, which
836 indicates to the C program that the getcwd() routine is available
837 to get the current working directory.
838
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839d_getespwnam (d_getespwnam.U):
840 This variable conditionally defines HAS_GETESPWNAM if getespwnam() is
841 available to retrieve enchanced (shadow) password entries by name.
842
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843d_getfsstat (d_getfsstat.U):
844 This variable conditionally defines the HAS_GETFSSTAT symbol, which
845 indicates to the C program that the getfsstat() routine is available.
846
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847d_getgrent (d_getgrent.U):
848 This variable conditionally defines the HAS_GETGRENT symbol, which
849 indicates to the C program that the getgrent() routine is available
850 for sequential access of the group database.
851
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852d_getgrent_r (d_getgrent_r.U):
853 This variable conditionally defines the HAS_GETGRENT_R symbol,
854 which indicates to the C program that the getgrent_r()
855 routine is available.
856
857d_getgrgid_r (d_getgrgid_r.U):
858 This variable conditionally defines the HAS_GETGRGID_R symbol,
859 which indicates to the C program that the getgrgid_r()
860 routine is available.
861
862d_getgrnam_r (d_getgrnam_r.U):
863 This variable conditionally defines the HAS_GETGRNAM_R symbol,
864 which indicates to the C program that the getgrnam_r()
865 routine is available.
866
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867d_getgrps (d_getgrps.U):
868 This variable conditionally defines the HAS_GETGROUPS symbol, which
869 indicates to the C program that the getgroups() routine is available
870 to get the list of process groups.
871
872d_gethbyaddr (d_gethbyad.U):
873 This variable conditionally defines the HAS_GETHOSTBYADDR symbol, which
874 indicates to the C program that the gethostbyaddr() routine is available
875 to look up hosts by their IP addresses.
876
877d_gethbyname (d_gethbynm.U):
878 This variable conditionally defines the HAS_GETHOSTBYNAME symbol, which
879 indicates to the C program that the gethostbyname() routine is available
880 to look up host names in some data base or other.
881
882d_gethent (d_gethent.U):
883 This variable conditionally defines HAS_GETHOSTENT if gethostent() is
884 available to look up host names in some data base or another.
885
886d_gethname (d_gethname.U):
887 This variable conditionally defines the HAS_GETHOSTNAME symbol, which
888 indicates to the C program that the gethostname() routine may be
889 used to derive the host name.
890
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891d_gethostbyaddr_r (d_gethostbyaddr_r.U):
892 This variable conditionally defines the HAS_GETHOSTBYADDR_R symbol,
893 which indicates to the C program that the gethostbyaddr_r()
894 routine is available.
895
896d_gethostbyname_r (d_gethostbyname_r.U):
897 This variable conditionally defines the HAS_GETHOSTBYNAME_R symbol,
898 which indicates to the C program that the gethostbyname_r()
899 routine is available.
900
901d_gethostent_r (d_gethostent_r.U):
902 This variable conditionally defines the HAS_GETHOSTENT_R symbol,
903 which indicates to the C program that the gethostent_r()
904 routine is available.
905
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906d_gethostprotos (d_gethostprotos.U):
907 This variable conditionally defines the HAS_GETHOST_PROTOS symbol,
908 which indicates to the C program that <netdb.h> supplies
909 prototypes for the various gethost*() functions.
910 See also netdbtype.U for probing for various netdb types.
911
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912d_getitimer (d_getitimer.U):
913 This variable conditionally defines the HAS_GETITIMER symbol, which
914 indicates to the C program that the getitimer() routine is available.
915
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916d_getlogin (d_getlogin.U):
917 This variable conditionally defines the HAS_GETLOGIN symbol, which
918 indicates to the C program that the getlogin() routine is available
919 to get the login name.
920
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921d_getlogin_r (d_getlogin_r.U):
922 This variable conditionally defines the HAS_GETLOGIN_R symbol,
923 which indicates to the C program that the getlogin_r()
924 routine is available.
925
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926d_getmnt (d_getmnt.U):
927 This variable conditionally defines the HAS_GETMNT symbol, which
928 indicates to the C program that the getmnt() routine is available
929 to retrieve one or more mount info blocks by filename.
930
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931d_getmntent (d_getmntent.U):
932 This variable conditionally defines the HAS_GETMNTENT symbol, which
933 indicates to the C program that the getmntent() routine is available
0617aed7 934 to iterate through mounted files to get their mount info.
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935
936d_getnbyaddr (d_getnbyad.U):
937 This variable conditionally defines the HAS_GETNETBYADDR symbol, which
938 indicates to the C program that the getnetbyaddr() routine is available
939 to look up networks by their IP addresses.
940
941d_getnbyname (d_getnbynm.U):
942 This variable conditionally defines the HAS_GETNETBYNAME symbol, which
943 indicates to the C program that the getnetbyname() routine is available
944 to look up networks by their names.
945
946d_getnent (d_getnent.U):
947 This variable conditionally defines HAS_GETNETENT if getnetent() is
948 available to look up network names in some data base or another.
949
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950d_getnetbyaddr_r (d_getnetbyaddr_r.U):
951 This variable conditionally defines the HAS_GETNETBYADDR_R symbol,
952 which indicates to the C program that the getnetbyaddr_r()
953 routine is available.
954
955d_getnetbyname_r (d_getnetbyname_r.U):
956 This variable conditionally defines the HAS_GETNETBYNAME_R symbol,
957 which indicates to the C program that the getnetbyname_r()
958 routine is available.
959
960d_getnetent_r (d_getnetent_r.U):
961 This variable conditionally defines the HAS_GETNETENT_R symbol,
962 which indicates to the C program that the getnetent_r()
963 routine is available.
964
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965d_getnetprotos (d_getnetprotos.U):
966 This variable conditionally defines the HAS_GETNET_PROTOS symbol,
967 which indicates to the C program that <netdb.h> supplies
968 prototypes for the various getnet*() functions.
969 See also netdbtype.U for probing for various netdb types.
970
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971d_getpagsz (d_getpagsz.U):
972 This variable conditionally defines HAS_GETPAGESIZE if getpagesize()
973 is available to get the system page size.
974
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975d_getpbyname (d_getprotby.U):
976 This variable conditionally defines the HAS_GETPROTOBYNAME
977 symbol, which indicates to the C program that the
978 getprotobyname() routine is available to look up protocols
979 by their name.
980
981d_getpbynumber (d_getprotby.U):
982 This variable conditionally defines the HAS_GETPROTOBYNUMBER
983 symbol, which indicates to the C program that the
984 getprotobynumber() routine is available to look up protocols
985 by their number.
986
987d_getpent (d_getpent.U):
988 This variable conditionally defines HAS_GETPROTOENT if getprotoent() is
989 available to look up protocols in some data base or another.
990
991d_getpgid (d_getpgid.U):
992 This variable conditionally defines the HAS_GETPGID symbol, which
993 indicates to the C program that the getpgid(pid) function
994 is available to get the process group id.
995
996d_getpgrp2 (d_getpgrp2.U):
997 This variable conditionally defines the HAS_GETPGRP2 symbol, which
998 indicates to the C program that the getpgrp2() (as in DG/UX) routine
999 is available to get the current process group.
1000
1001d_getpgrp (d_getpgrp.U):
1002 This variable conditionally defines HAS_GETPGRP if getpgrp() is
1003 available to get the current process group.
1004
1005d_getppid (d_getppid.U):
1006 This variable conditionally defines the HAS_GETPPID symbol, which
1007 indicates to the C program that the getppid() routine is available
1008 to get the parent process ID.
1009
1010d_getprior (d_getprior.U):
1011 This variable conditionally defines HAS_GETPRIORITY if getpriority()
1012 is available to get a process's priority.
1013
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1014d_getprotobyname_r (d_getprotobyname_r.U):
1015 This variable conditionally defines the HAS_GETPROTOBYNAME_R symbol,
1016 which indicates to the C program that the getprotobyname_r()
1017 routine is available.
1018
1019d_getprotobynumber_r (d_getprotobynumber_r.U):
1020 This variable conditionally defines the HAS_GETPROTOBYNUMBER_R symbol,
1021 which indicates to the C program that the getprotobynumber_r()
1022 routine is available.
1023
1024d_getprotoent_r (d_getprotoent_r.U):
1025 This variable conditionally defines the HAS_GETPROTOENT_R symbol,
1026 which indicates to the C program that the getprotoent_r()
1027 routine is available.
1028
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1029d_getprotoprotos (d_getprotoprotos.U):
1030 This variable conditionally defines the HAS_GETPROTO_PROTOS symbol,
1031 which indicates to the C program that <netdb.h> supplies
1032 prototypes for the various getproto*() functions.
1033 See also netdbtype.U for probing for various netdb types.
1034
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1035d_getprpwnam (d_getprpwnam.U):
1036 This variable conditionally defines HAS_GETPRPWNAM if getprpwnam() is
1037 available to retrieve protected (shadow) password entries by name.
1038
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1039d_getpwent (d_getpwent.U):
1040 This variable conditionally defines the HAS_GETPWENT symbol, which
1041 indicates to the C program that the getpwent() routine is available
1042 for sequential access of the passwd database.
1043
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1044d_getpwent_r (d_getpwent_r.U):
1045 This variable conditionally defines the HAS_GETPWENT_R symbol,
1046 which indicates to the C program that the getpwent_r()
1047 routine is available.
1048
1049d_getpwnam_r (d_getpwnam_r.U):
1050 This variable conditionally defines the HAS_GETPWNAM_R symbol,
1051 which indicates to the C program that the getpwnam_r()
1052 routine is available.
1053
1054d_getpwuid_r (d_getpwuid_r.U):
1055 This variable conditionally defines the HAS_GETPWUID_R symbol,
1056 which indicates to the C program that the getpwuid_r()
1057 routine is available.
1058
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1059d_getsbyname (d_getsrvby.U):
1060 This variable conditionally defines the HAS_GETSERVBYNAME
1061 symbol, which indicates to the C program that the
1062 getservbyname() routine is available to look up services
1063 by their name.
1064
1065d_getsbyport (d_getsrvby.U):
1066 This variable conditionally defines the HAS_GETSERVBYPORT
1067 symbol, which indicates to the C program that the
1068 getservbyport() routine is available to look up services
1069 by their port.
1070
1071d_getsent (d_getsent.U):
1072 This variable conditionally defines HAS_GETSERVENT if getservent() is
1073 available to look up network services in some data base or another.
1074
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1075d_getservbyname_r (d_getservbyname_r.U):
1076 This variable conditionally defines the HAS_GETSERVBYNAME_R symbol,
1077 which indicates to the C program that the getservbyname_r()
1078 routine is available.
1079
1080d_getservbyport_r (d_getservbyport_r.U):
1081 This variable conditionally defines the HAS_GETSERVBYPORT_R symbol,
1082 which indicates to the C program that the getservbyport_r()
1083 routine is available.
1084
1085d_getservent_r (d_getservent_r.U):
1086 This variable conditionally defines the HAS_GETSERVENT_R symbol,
1087 which indicates to the C program that the getservent_r()
1088 routine is available.
1089
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1090d_getservprotos (d_getservprotos.U):
1091 This variable conditionally defines the HAS_GETSERV_PROTOS symbol,
1092 which indicates to the C program that <netdb.h> supplies
1093 prototypes for the various getserv*() functions.
1094 See also netdbtype.U for probing for various netdb types.
1095
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JH
1096d_getspnam (d_getspnam.U):
1097 This variable conditionally defines HAS_GETSPNAM if getspnam() is
1098 available to retrieve SysV shadow password entries by name.
1099
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1100d_getspnam_r (d_getspnam_r.U):
1101 This variable conditionally defines the HAS_GETSPNAM_R symbol,
1102 which indicates to the C program that the getspnam_r()
1103 routine is available.
1104
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1105d_gettimeod (d_ftime.U):
1106 This variable conditionally defines the HAS_GETTIMEOFDAY symbol, which
1107 indicates that the gettimeofday() system call exists (to obtain a
1108 sub-second accuracy clock). You should probably include <sys/resource.h>.
1109
10bc17b6
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1110d_gmtime_r (d_gmtime_r.U):
1111 This variable conditionally defines the HAS_GMTIME_R symbol,
1112 which indicates to the C program that the gmtime_r()
1113 routine is available.
1114
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1115d_gnulibc (d_gnulibc.U):
1116 Defined if we're dealing with the GNU C Library.
1117
1118d_grpasswd (i_grp.U):
1119 This variable conditionally defines GRPASSWD, which indicates
1120 that struct group in <grp.h> contains gr_passwd.
1121
1122d_hasmntopt (d_hasmntopt.U):
1123 This variable conditionally defines the HAS_HASMNTOPT symbol, which
1124 indicates to the C program that the hasmntopt() routine is available
1125 to query the mount options of file systems.
1126
1127d_htonl (d_htonl.U):
1128 This variable conditionally defines HAS_HTONL if htonl() and its
1129 friends are available to do network order byte swapping.
1130
5c567d7d
JH
1131d_ilogbl (d_ilogbl.U):
1132 This variable conditionally defines the HAS_ILOGBL symbol, which
1133 indicates to the C program that the ilogbl() routine is available.
1134 If scalbnl is also present we can emulate frexpl.
1135
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1136d_index (d_strchr.U):
1137 This variable conditionally defines HAS_INDEX if index() and
1138 rindex() are available for string searching.
1139
1140d_inetaton (d_inetaton.U):
1141 This variable conditionally defines the HAS_INET_ATON symbol, which
1142 indicates to the C program that the inet_aton() function is available
1143 to parse IP address "dotted-quad" strings.
1144
13b3f787 1145d_int64_t (d_int64_t.U):
781b178c
JH
1146 This symbol will be defined if the C compiler supports int64_t.
1147
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1148d_isascii (d_isascii.U):
1149 This variable conditionally defines the HAS_ISASCII constant,
1150 which indicates to the C program that isascii() is available.
1151
758a5d79
JH
1152d_isfinite (d_isfinite.U):
1153 This variable conditionally defines the HAS_ISFINITE symbol, which
1154 indicates to the C program that the isfinite() routine is available.
1155
1156d_isinf (d_isinf.U):
1157 This variable conditionally defines the HAS_ISINF symbol, which
1158 indicates to the C program that the isinf() routine is available.
1159
a3540c92
JH
1160d_isnan (d_isnan.U):
1161 This variable conditionally defines the HAS_ISNAN symbol, which
1162 indicates to the C program that the isnan() routine is available.
1163
1164d_isnanl (d_isnanl.U):
1165 This variable conditionally defines the HAS_ISNANL symbol, which
1166 indicates to the C program that the isnanl() routine is available.
1167
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1168d_killpg (d_killpg.U):
1169 This variable conditionally defines the HAS_KILLPG symbol, which
1170 indicates to the C program that the killpg() routine is available
1171 to kill process groups.
1172
1173d_lchown (d_lchown.U):
1174 This variable conditionally defines the HAS_LCHOWN symbol, which
1175 indicates to the C program that the lchown() routine is available
1176 to operate on a symbolic link (instead of following the link).
1177
ca24dfc6
LV
1178d_ldbl_dig (d_ldbl_dig.U):
1179 This variable conditionally defines d_ldbl_dig if this system's
1180 header files provide LDBL_DIG, which is the number of significant
1181 digits in a long double precision number.
1182
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1183d_link (d_link.U):
1184 This variable conditionally defines HAS_LINK if link() is
1185 available to create hard links.
1186
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JH
1187d_localtime_r (d_localtime_r.U):
1188 This variable conditionally defines the HAS_LOCALTIME_R symbol,
1189 which indicates to the C program that the localtime_r()
1190 routine is available.
1191
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1192d_locconv (d_locconv.U):
1193 This variable conditionally defines HAS_LOCALECONV if localeconv() is
1194 available for numeric and monetary formatting conventions.
1195
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1196d_lockf (d_lockf.U):
1197 This variable conditionally defines HAS_LOCKF if lockf() is
1198 available to do file locking.
1199
1200d_longdbl (d_longdbl.U):
1201 This variable conditionally defines HAS_LONG_DOUBLE if
1202 the long double type is supported.
1203
1204d_longlong (d_longlong.U):
1205 This variable conditionally defines HAS_LONG_LONG if
1206 the long long type is supported.
1207
c890dc6c
JH
1208d_lseekproto (d_lseekproto.U):
1209 This variable conditionally defines the HAS_LSEEK_PROTO symbol,
1210 which indicates to the C program that the system provides
1211 a prototype for the lseek() function. Otherwise, it is
1212 up to the program to supply one.
1213
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1214d_lstat (d_lstat.U):
1215 This variable conditionally defines HAS_LSTAT if lstat() is
1216 available to do file stats on symbolic links.
1217
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JH
1218d_madvise (d_madvise.U):
1219 This variable conditionally defines HAS_MADVISE if madvise() is
1220 available to map a file into memory.
1221
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1222d_malloc_size (d_malloc_size.U):
1223 This symbol, if defined, indicates that the malloc_size
1224 routine is available for use.
1225
1226d_malloc_good_size (d_malloc_good_size.U):
1227 This symbol, if defined, indicates that the malloc_good_size
1228 routine is available for use.
1229
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1230d_mblen (d_mblen.U):
1231 This variable conditionally defines the HAS_MBLEN symbol, which
1232 indicates to the C program that the mblen() routine is available
1233 to find the number of bytes in a multibye character.
1234
1235d_mbstowcs (d_mbstowcs.U):
1236 This variable conditionally defines the HAS_MBSTOWCS symbol, which
1237 indicates to the C program that the mbstowcs() routine is available
1238 to convert a multibyte string into a wide character string.
1239
1240d_mbtowc (d_mbtowc.U):
1241 This variable conditionally defines the HAS_MBTOWC symbol, which
1242 indicates to the C program that the mbtowc() routine is available
1243 to convert multibyte to a wide character.
1244
1245d_memchr (d_memchr.U):
1246 This variable conditionally defines the HAS_MEMCHR symbol, which
1247 indicates to the C program that the memchr() routine is available
1248 to locate characters within a C string.
1249
1250d_memcmp (d_memcmp.U):
1251 This variable conditionally defines the HAS_MEMCMP symbol, which
1252 indicates to the C program that the memcmp() routine is available
1253 to compare blocks of memory.
1254
1255d_memcpy (d_memcpy.U):
1256 This variable conditionally defines the HAS_MEMCPY symbol, which
1257 indicates to the C program that the memcpy() routine is available
1258 to copy blocks of memory.
1259
1260d_memmove (d_memmove.U):
1261 This variable conditionally defines the HAS_MEMMOVE symbol, which
1262 indicates to the C program that the memmove() routine is available
1263 to copy potentatially overlapping blocks of memory.
1264
1265d_memset (d_memset.U):
1266 This variable conditionally defines the HAS_MEMSET symbol, which
1267 indicates to the C program that the memset() routine is available
1268 to set blocks of memory.
1269
1270d_mkdir (d_mkdir.U):
1271 This variable conditionally defines the HAS_MKDIR symbol, which
1272 indicates to the C program that the mkdir() routine is available
209e5c0a 1273 to create directories..
781b178c 1274
fe749a9f
JH
1275d_mkdtemp (d_mkdtemp.U):
1276 This variable conditionally defines the HAS_MKDTEMP symbol, which
1277 indicates to the C program that the mkdtemp() routine is available
1278 to exclusively create a uniquely named temporary directory.
1279
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JH
1280d_mkfifo (d_mkfifo.U):
1281 This variable conditionally defines the HAS_MKFIFO symbol, which
1282 indicates to the C program that the mkfifo() routine is available.
1283
fe749a9f
JH
1284d_mkstemp (d_mkstemp.U):
1285 This variable conditionally defines the HAS_MKSTEMP symbol, which
1286 indicates to the C program that the mkstemp() routine is available
1287 to exclusively create and open a uniquely named temporary file.
1288
1289d_mkstemps (d_mkstemps.U):
1290 This variable conditionally defines the HAS_MKSTEMPS symbol, which
1291 indicates to the C program that the mkstemps() routine is available
1292 to exclusively create and open a uniquely named (with a suffix)
1293 temporary file.
1294
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1295d_mktime (d_mktime.U):
1296 This variable conditionally defines the HAS_MKTIME symbol, which
1297 indicates to the C program that the mktime() routine is available.
1298
fe749a9f
JH
1299d_mmap (d_mmap.U):
1300 This variable conditionally defines HAS_MMAP if mmap() is
1301 available to map a file into memory.
1302
a3540c92
JH
1303d_modfl (d_modfl.U):
1304 This variable conditionally defines the HAS_MODFL symbol, which
1305 indicates to the C program that the modfl() routine is available.
1306
e67aeab1
JH
1307d_modfl_pow32_bug (d_modfl.U):
1308 This variable conditionally defines the HAS_MODFL_POW32_BUG symbol,
1309 which indicates that modfl() is broken for long doubles >= pow(2, 32).
1310 For example from 4294967303.150000 one would get 4294967302.000000
1311 and 1.150000. The bug has been seen in certain versions of glibc,
1312 release 2.2.2 is known to be okay.
1313
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MB
1314d_modflproto (d_modfl.U):
1315 This symbol, if defined, indicates that the system provides
1316 a prototype for the modfl() function. Otherwise, it is up
1317 to the program to supply one. C99 says it should be
1318 long double modfl(long double, long double *);
1319
fe749a9f
JH
1320d_mprotect (d_mprotect.U):
1321 This variable conditionally defines HAS_MPROTECT if mprotect() is
1322 available to modify the access protection of a memory mapped file.
1323
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JH
1324d_msg (d_msg.U):
1325 This variable conditionally defines the HAS_MSG symbol, which
1326 indicates that the entire msg*(2) library is present.
1327
1328d_msg_ctrunc (d_socket.U):
1329 This variable conditionally defines the HAS_MSG_CTRUNC symbol,
1330 which indicates that the MSG_CTRUNC is available. #ifdef is
1331 not enough because it may be an enum, glibc has been known to do this.
1332
1333d_msg_dontroute (d_socket.U):
1334 This variable conditionally defines the HAS_MSG_DONTROUTE symbol,
1335 which indicates that the MSG_DONTROUTE is available. #ifdef is
1336 not enough because it may be an enum, glibc has been known to do this.
1337
1338d_msg_oob (d_socket.U):
1339 This variable conditionally defines the HAS_MSG_OOB symbol,
1340 which indicates that the MSG_OOB is available. #ifdef is
1341 not enough because it may be an enum, glibc has been known to do this.
1342
1343d_msg_peek (d_socket.U):
1344 This variable conditionally defines the HAS_MSG_PEEK symbol,
1345 which indicates that the MSG_PEEK is available. #ifdef is
1346 not enough because it may be an enum, glibc has been known to do this.
1347
1348d_msg_proxy (d_socket.U):
1349 This variable conditionally defines the HAS_MSG_PROXY symbol,
1350 which indicates that the MSG_PROXY is available. #ifdef is
1351 not enough because it may be an enum, glibc has been known to do this.
1352
1353d_msgctl (d_msgctl.U):
1354 This variable conditionally defines the HAS_MSGCTL symbol, which
1355 indicates to the C program that the msgctl() routine is available.
1356
1357d_msgget (d_msgget.U):
1358 This variable conditionally defines the HAS_MSGGET symbol, which
1359 indicates to the C program that the msgget() routine is available.
1360
4e0554ec
JH
1361d_msghdr_s (d_msghdr_s.U):
1362 This variable conditionally defines the HAS_STRUCT_MSGHDR symbol,
1363 which indicates that the struct msghdr is supported.
1364
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JH
1365d_msgrcv (d_msgrcv.U):
1366 This variable conditionally defines the HAS_MSGRCV symbol, which
1367 indicates to the C program that the msgrcv() routine is available.
1368
1369d_msgsnd (d_msgsnd.U):
1370 This variable conditionally defines the HAS_MSGSND symbol, which
1371 indicates to the C program that the msgsnd() routine is available.
1372
fe749a9f
JH
1373d_msync (d_msync.U):
1374 This variable conditionally defines HAS_MSYNC if msync() is
1375 available to synchronize a mapped file.
1376
1377d_munmap (d_munmap.U):
1378 This variable conditionally defines HAS_MUNMAP if munmap() is
1379 available to unmap a region mapped by mmap().
1380
781b178c
JH
1381d_mymalloc (mallocsrc.U):
1382 This variable conditionally defines MYMALLOC in case other parts
1383 of the source want to take special action if MYMALLOC is used.
1384 This may include different sorts of profiling or error detection.
1385
781b178c
JH
1386d_nice (d_nice.U):
1387 This variable conditionally defines the HAS_NICE symbol, which
1388 indicates to the C program that the nice() routine is available.
1389
2765b840
JH
1390d_nl_langinfo (d_nl_langinfo.U):
1391 This variable conditionally defines the HAS_NL_LANGINFO symbol, which
1392 indicates to the C program that the nl_langinfo() routine is available.
1393
78691af5 1394d_nv_preserves_uv (perlxv.U):
cce08f5b
JH
1395 This variable indicates whether a variable of type nvtype
1396 can preserve all the bits a variable of type uvtype.
1397
f607920a
CB
1398d_nv_zero_is_allbits_zero (perlxv.U):
1399 This variable indicates whether a variable of type nvtype
1400 stores 0.0 in memory as all bits zero.
1401
c890dc6c 1402d_off64_t (d_off64_t.U):
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JH
1403 This symbol will be defined if the C compiler supports off64_t.
1404
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JH
1405d_old_pthread_create_joinable (d_pthrattrj.U):
1406 This variable conditionally defines pthread_create_joinable.
1407 undef if pthread.h defines PTHREAD_CREATE_JOINABLE.
1408
1409d_oldpthreads (usethreads.U):
1410 This variable conditionally defines the OLD_PTHREADS_API symbol,
1411 and indicates that Perl should be built to use the old
8c09e4ca 1412 draft POSIX threads API. This is only potentially meaningful if
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JH
1413 usethreads is set.
1414
1415d_oldsock (d_socket.U):
1416 This variable conditionally defines the OLDSOCKET symbol, which
1417 indicates that the BSD socket interface is based on 4.1c and not 4.2.
1418
1419d_open3 (d_open3.U):
1420 This variable conditionally defines the HAS_OPEN3 manifest constant,
1421 which indicates to the C program that the 3 argument version of
1422 the open(2) function is available.
1423
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1424d_pathconf (d_pathconf.U):
1425 This variable conditionally defines the HAS_PATHCONF symbol, which
1426 indicates to the C program that the pathconf() routine is available
1427 to determine file-system related limits and options associated
1428 with a given filename.
1429
1430d_pause (d_pause.U):
1431 This variable conditionally defines the HAS_PAUSE symbol, which
1432 indicates to the C program that the pause() routine is available
1433 to suspend a process until a signal is received.
1434
3b777bb4
GS
1435d_perl_otherlibdirs (otherlibdirs.U):
1436 This variable conditionally defines PERL_OTHERLIBDIRS, which
1437 contains a colon-separated set of paths for the perl binary to
1438 include in @INC. See also otherlibdirs.
1439
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JH
1440d_phostname (d_gethname.U):
1441 This variable conditionally defines the HAS_PHOSTNAME symbol, which
1442 contains the shell command which, when fed to popen(), may be
1443 used to derive the host name.
1444
1445d_pipe (d_pipe.U):
1446 This variable conditionally defines the HAS_PIPE symbol, which
1447 indicates to the C program that the pipe() routine is available
1448 to create an inter-process channel.
1449
1450d_poll (d_poll.U):
1451 This variable conditionally defines the HAS_POLL symbol, which
1452 indicates to the C program that the poll() routine is available
1453 to poll active file descriptors.
1454
1455d_portable (d_portable.U):
1456 This variable conditionally defines the PORTABLE symbol, which
1457 indicates to the C program that it should not assume that it is
1458 running on the machine it was compiled on.
1459
4d54317a
JH
1460d_PRId64 (quadfio.U):
1461 This variable conditionally defines the PERL_PRId64 symbol, which
1462 indiciates that stdio has a symbol to print 64-bit decimal numbers.
1463
1464d_PRIeldbl (longdblfio.U):
1465 This variable conditionally defines the PERL_PRIfldbl symbol, which
1466 indiciates that stdio has a symbol to print long doubles.
1467
1468d_PRIEUldbl (longdblfio.U):
1469 This variable conditionally defines the PERL_PRIfldbl symbol, which
1470 indiciates that stdio has a symbol to print long doubles.
1471 The 'U' in the name is to separate this from d_PRIeldbl so that even
1472 case-blind systems can see the difference.
1473
1474d_PRIfldbl (longdblfio.U):
1475 This variable conditionally defines the PERL_PRIfldbl symbol, which
1476 indiciates that stdio has a symbol to print long doubles.
1477
1478d_PRIFUldbl (longdblfio.U):
1479 This variable conditionally defines the PERL_PRIfldbl symbol, which
1480 indiciates that stdio has a symbol to print long doubles.
1481 The 'U' in the name is to separate this from d_PRIfldbl so that even
1482 case-blind systems can see the difference.
1483
1484d_PRIgldbl (longdblfio.U):
1485 This variable conditionally defines the PERL_PRIfldbl symbol, which
1486 indiciates that stdio has a symbol to print long doubles.
1487
1488d_PRIGUldbl (longdblfio.U):
1489 This variable conditionally defines the PERL_PRIfldbl symbol, which
1490 indiciates that stdio has a symbol to print long doubles.
1491 The 'U' in the name is to separate this from d_PRIgldbl so that even
1492 case-blind systems can see the difference.
1493
1494d_PRIi64 (quadfio.U):
1495 This variable conditionally defines the PERL_PRIi64 symbol, which
1496 indiciates that stdio has a symbol to print 64-bit decimal numbers.
1497
1498d_PRIo64 (quadfio.U):
1499 This variable conditionally defines the PERL_PRIo64 symbol, which
1500 indiciates that stdio has a symbol to print 64-bit octal numbers.
1501
1502d_PRIu64 (quadfio.U):
1503 This variable conditionally defines the PERL_PRIu64 symbol, which
1504 indiciates that stdio has a symbol to print 64-bit unsigned decimal
1505 numbers.
1506
1507d_PRIx64 (quadfio.U):
1508 This variable conditionally defines the PERL_PRIx64 symbol, which
1509 indiciates that stdio has a symbol to print 64-bit hexadecimal numbers.
1510
1511d_PRIXU64 (quadfio.U):
1512 This variable conditionally defines the PERL_PRIXU64 symbol, which
1513 indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers.
1514 The 'U' in the name is to separate this from d_PRIx64 so that even
1515 case-blind systems can see the difference.
1516
428dc699
JH
1517d_procselfexe (d_procselfexe.U):
1518 Defined if $procselfexe is symlink to the absolute
1519 pathname of the executing program.
1520
d6483fcc
JH
1521d_pthread_atfork (d_pthread_atfork.U):
1522 This variable conditionally defines the HAS_PTHREAD_ATFORK symbol,
1523 which indicates to the C program that the pthread_atfork()
1524 routine is available.
1525
505656d3
JH
1526d_pthread_attr_setscope (d_pthread_attr_ss.U):
1527 This variable conditionally defines HAS_PTHREAD_ATTR_SETSCOPE if
1528 pthread_attr_setscope() is available to set the contention scope
1529 attribute of a thread attribute object.
1530
781b178c
JH
1531d_pthread_yield (d_pthread_y.U):
1532 This variable conditionally defines the HAS_PTHREAD_YIELD
1533 symbol if the pthread_yield routine is available to yield
1534 the execution of the current thread.
1535
1536d_pwage (i_pwd.U):
1537 This variable conditionally defines PWAGE, which indicates
1538 that struct passwd contains pw_age.
1539
1540d_pwchange (i_pwd.U):
1541 This variable conditionally defines PWCHANGE, which indicates
1542 that struct passwd contains pw_change.
1543
1544d_pwclass (i_pwd.U):
1545 This variable conditionally defines PWCLASS, which indicates
1546 that struct passwd contains pw_class.
1547
1548d_pwcomment (i_pwd.U):
1549 This variable conditionally defines PWCOMMENT, which indicates
1550 that struct passwd contains pw_comment.
1551
1552d_pwexpire (i_pwd.U):
1553 This variable conditionally defines PWEXPIRE, which indicates
1554 that struct passwd contains pw_expire.
1555
1556d_pwgecos (i_pwd.U):
1557 This variable conditionally defines PWGECOS, which indicates
1558 that struct passwd contains pw_gecos.
1559
1560d_pwpasswd (i_pwd.U):
1561 This variable conditionally defines PWPASSWD, which indicates
1562 that struct passwd contains pw_passwd.
1563
1564d_pwquota (i_pwd.U):
1565 This variable conditionally defines PWQUOTA, which indicates
1566 that struct passwd contains pw_quota.
1567
792d8dab
JH
1568d_qgcvt (d_qgcvt.U):
1569 This variable conditionally defines the HAS_QGCVT symbol, which
1570 indicates to the C program that the qgcvt() routine is available.
1571
de1c2614
JH
1572d_quad (quadtype.U):
1573 This variable, if defined, tells that there's a 64-bit integer type,
1574 quadtype.
1575
10bc17b6
JH
1576d_random_r (d_random_r.U):
1577 This variable conditionally defines the HAS_RANDOM_R symbol,
1578 which indicates to the C program that the random_r()
1579 routine is available.
1580
1581d_readdir64_r (d_readdir64_r.U):
1582 This variable conditionally defines the HAS_READDIR64_R symbol,
1583 which indicates to the C program that the readdir64_r()
1584 routine is available.
1585
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JH
1586d_readdir (d_readdir.U):
1587 This variable conditionally defines HAS_READDIR if readdir() is
1588 available to read directory entries.
1589
10bc17b6
JH
1590d_readdir_r (d_readdir_r.U):
1591 This variable conditionally defines the HAS_READDIR_R symbol,
1592 which indicates to the C program that the readdir_r()
1593 routine is available.
1594
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JH
1595d_readlink (d_readlink.U):
1596 This variable conditionally defines the HAS_READLINK symbol, which
1597 indicates to the C program that the readlink() routine is available
1598 to read the value of a symbolic link.
1599
4e0554ec
JH
1600d_readv (d_readv.U):
1601 This variable conditionally defines the HAS_READV symbol, which
1602 indicates to the C program that the readv() routine is available.
1603
1604d_recvmsg (d_recvmsg.U):
1605 This variable conditionally defines the HAS_RECVMSG symbol, which
1606 indicates to the C program that the recvmsg() routine is available.
1607
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JH
1608d_rename (d_rename.U):
1609 This variable conditionally defines the HAS_RENAME symbol, which
1610 indicates to the C program that the rename() routine is available
1611 to rename files.
1612
1613d_rewinddir (d_readdir.U):
1614 This variable conditionally defines HAS_REWINDDIR if rewinddir() is
1615 available.
1616
1617d_rmdir (d_rmdir.U):
1618 This variable conditionally defines HAS_RMDIR if rmdir() is
1619 available to remove directories.
1620
1621d_safebcpy (d_safebcpy.U):
1622 This variable conditionally defines the HAS_SAFE_BCOPY symbol if
b6cc3bc4
AD
1623 the bcopy() routine can do overlapping copies. Normally, you
1624 should probably use memmove().
781b178c
JH
1625
1626d_safemcpy (d_safemcpy.U):
1627 This variable conditionally defines the HAS_SAFE_MEMCPY symbol if
1628 the memcpy() routine can do overlapping copies.
b6cc3bc4 1629 For overlapping copies, memmove() should be used, if available.
781b178c
JH
1630
1631d_sanemcmp (d_sanemcmp.U):
1632 This variable conditionally defines the HAS_SANE_MEMCMP symbol if
1633 the memcpy() routine is available and can be used to compare relative
1634 magnitudes of chars with their high bits set.
1635
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1636d_sbrkproto (d_sbrkproto.U):
1637 This variable conditionally defines the HAS_SBRK_PROTO symbol,
1638 which indicates to the C program that the system provides
1639 a prototype for the sbrk() function. Otherwise, it is
1640 up to the program to supply one.
1641
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1642d_scalbnl (d_scalbnl.U):
1643 This variable conditionally defines the HAS_SCALBNL symbol, which
1644 indicates to the C program that the scalbnl() routine is available.
1645 If ilogbl is also present we can emulate frexpl.
1646
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1647d_sched_yield (d_pthread_y.U):
1648 This variable conditionally defines the HAS_SCHED_YIELD
1649 symbol if the sched_yield routine is available to yield
1650 the execution of the current thread.
1651
1652d_scm_rights (d_socket.U):
1653 This variable conditionally defines the HAS_SCM_RIGHTS symbol,
1654 which indicates that the SCM_RIGHTS is available. #ifdef is
1655 not enough because it may be an enum, glibc has been known to do this.
1656
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1657d_SCNfldbl (longdblfio.U):
1658 This variable conditionally defines the PERL_PRIfldbl symbol, which
1659 indiciates that stdio has a symbol to scan long doubles.
1660
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1661d_seekdir (d_readdir.U):
1662 This variable conditionally defines HAS_SEEKDIR if seekdir() is
1663 available.
1664
1665d_select (d_select.U):
1666 This variable conditionally defines HAS_SELECT if select() is
1667 available to select active file descriptors. A <sys/time.h>
1668 inclusion may be necessary for the timeout field.
1669
1670d_sem (d_sem.U):
1671 This variable conditionally defines the HAS_SEM symbol, which
1672 indicates that the entire sem*(2) library is present.
1673
1674d_semctl (d_semctl.U):
1675 This variable conditionally defines the HAS_SEMCTL symbol, which
1676 indicates to the C program that the semctl() routine is available.
1677
1678d_semctl_semid_ds (d_union_semun.U):
1679 This variable conditionally defines USE_SEMCTL_SEMID_DS, which
1680 indicates that struct semid_ds * is to be used for semctl IPC_STAT.
1681
1682d_semctl_semun (d_union_semun.U):
1683 This variable conditionally defines USE_SEMCTL_SEMUN, which
1684 indicates that union semun is to be used for semctl IPC_STAT.
1685
1686d_semget (d_semget.U):
1687 This variable conditionally defines the HAS_SEMGET symbol, which
1688 indicates to the C program that the semget() routine is available.
1689
1690d_semop (d_semop.U):
1691 This variable conditionally defines the HAS_SEMOP symbol, which
1692 indicates to the C program that the semop() routine is available.
1693
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1694d_sendmsg (d_sendmsg.U):
1695 This variable conditionally defines the HAS_SENDMSG symbol, which
1696 indicates to the C program that the sendmsg() routine is available.
1697
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1698d_setegid (d_setegid.U):
1699 This variable conditionally defines the HAS_SETEGID symbol, which
1700 indicates to the C program that the setegid() routine is available
1701 to change the effective gid of the current program.
1702
1703d_seteuid (d_seteuid.U):
1704 This variable conditionally defines the HAS_SETEUID symbol, which
1705 indicates to the C program that the seteuid() routine is available
1706 to change the effective uid of the current program.
1707
1708d_setgrent (d_setgrent.U):
1709 This variable conditionally defines the HAS_SETGRENT symbol, which
1710 indicates to the C program that the setgrent() routine is available
1711 for initializing sequential access to the group database.
1712
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1713d_setgrent_r (d_setgrent_r.U):
1714 This variable conditionally defines the HAS_SETGRENT_R symbol,
1715 which indicates to the C program that the setgrent_r()
1716 routine is available.
1717
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1718d_setgrps (d_setgrps.U):
1719 This variable conditionally defines the HAS_SETGROUPS symbol, which
1720 indicates to the C program that the setgroups() routine is available
1721 to set the list of process groups.
1722
1723d_sethent (d_sethent.U):
1724 This variable conditionally defines HAS_SETHOSTENT if sethostent() is
1725 available.
1726
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1727d_sethostent_r (d_sethostent_r.U):
1728 This variable conditionally defines the HAS_SETHOSTENT_R symbol,
1729 which indicates to the C program that the sethostent_r()
1730 routine is available.
1731
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1732d_setitimer (d_setitimer.U):
1733 This variable conditionally defines the HAS_SETITIMER symbol, which
1734 indicates to the C program that the setitimer() routine is available.
1735
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1736d_setlinebuf (d_setlnbuf.U):
1737 This variable conditionally defines the HAS_SETLINEBUF symbol, which
1738 indicates to the C program that the setlinebuf() routine is available
1739 to change stderr or stdout from block-buffered or unbuffered to a
1740 line-buffered mode.
1741
1742d_setlocale (d_setlocale.U):
1743 This variable conditionally defines HAS_SETLOCALE if setlocale() is
1744 available to handle locale-specific ctype implementations.
1745
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1746d_setlocale_r (d_setlocale_r.U):
1747 This variable conditionally defines the HAS_SETLOCALE_R symbol,
1748 which indicates to the C program that the setlocale_r()
1749 routine is available.
1750
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1751d_setnent (d_setnent.U):
1752 This variable conditionally defines HAS_SETNETENT if setnetent() is
1753 available.
1754
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1755d_setnetent_r (d_setnetent_r.U):
1756 This variable conditionally defines the HAS_SETNETENT_R symbol,
1757 which indicates to the C program that the setnetent_r()
1758 routine is available.
1759
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1760d_setpent (d_setpent.U):
1761 This variable conditionally defines HAS_SETPROTOENT if setprotoent() is
1762 available.
1763
1764d_setpgid (d_setpgid.U):
1765 This variable conditionally defines the HAS_SETPGID symbol if the
1766 setpgid(pid, gpid) function is available to set process group ID.
1767
1768d_setpgrp2 (d_setpgrp2.U):
1769 This variable conditionally defines the HAS_SETPGRP2 symbol, which
1770 indicates to the C program that the setpgrp2() (as in DG/UX) routine
1771 is available to set the current process group.
1772
1773d_setpgrp (d_setpgrp.U):
1774 This variable conditionally defines HAS_SETPGRP if setpgrp() is
1775 available to set the current process group.
1776
1777d_setprior (d_setprior.U):
1778 This variable conditionally defines HAS_SETPRIORITY if setpriority()
1779 is available to set a process's priority.
1780
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1781d_setproctitle (d_setproctitle.U):
1782 This variable conditionally defines the HAS_SETPROCTITLE symbol,
1783 which indicates to the C program that the setproctitle() routine
1784 is available.
1785
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1786d_setprotoent_r (d_setprotoent_r.U):
1787 This variable conditionally defines the HAS_SETPROTOENT_R symbol,
1788 which indicates to the C program that the setprotoent_r()
1789 routine is available.
1790
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1791d_setpwent (d_setpwent.U):
1792 This variable conditionally defines the HAS_SETPWENT symbol, which
1793 indicates to the C program that the setpwent() routine is available
1794 for initializing sequential access to the passwd database.
1795
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1796d_setpwent_r (d_setpwent_r.U):
1797 This variable conditionally defines the HAS_SETPWENT_R symbol,
1798 which indicates to the C program that the setpwent_r()
1799 routine is available.
1800
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1801d_setregid (d_setregid.U):
1802 This variable conditionally defines HAS_SETREGID if setregid() is
1803 available to change the real and effective gid of the current
1804 process.
1805
1806d_setresgid (d_setregid.U):
1807 This variable conditionally defines HAS_SETRESGID if setresgid() is
1808 available to change the real, effective and saved gid of the current
1809 process.
1810
1811d_setresuid (d_setreuid.U):
1812 This variable conditionally defines HAS_SETREUID if setresuid() is
1813 available to change the real, effective and saved uid of the current
1814 process.
1815
1816d_setreuid (d_setreuid.U):
1817 This variable conditionally defines HAS_SETREUID if setreuid() is
1818 available to change the real and effective uid of the current
1819 process.
1820
1821d_setrgid (d_setrgid.U):
1822 This variable conditionally defines the HAS_SETRGID symbol, which
1823 indicates to the C program that the setrgid() routine is available
1824 to change the real gid of the current program.
1825
1826d_setruid (d_setruid.U):
1827 This variable conditionally defines the HAS_SETRUID symbol, which
1828 indicates to the C program that the setruid() routine is available
1829 to change the real uid of the current program.
1830
1831d_setsent (d_setsent.U):
1832 This variable conditionally defines HAS_SETSERVENT if setservent() is
1833 available.
1834
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1835d_setservent_r (d_setservent_r.U):
1836 This variable conditionally defines the HAS_SETSERVENT_R symbol,
1837 which indicates to the C program that the setservent_r()
1838 routine is available.
1839
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1840d_setsid (d_setsid.U):
1841 This variable conditionally defines HAS_SETSID if setsid() is
1842 available to set the process group ID.
1843
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1844d_setvbuf (d_setvbuf.U):
1845 This variable conditionally defines the HAS_SETVBUF symbol, which
1846 indicates to the C program that the setvbuf() routine is available
1847 to change buffering on an open stdio stream.
1848
1849d_sfio (d_sfio.U):
1850 This variable conditionally defines the USE_SFIO symbol,
1851 and indicates whether sfio is available (and should be used).
1852
1853d_shm (d_shm.U):
1854 This variable conditionally defines the HAS_SHM symbol, which
1855 indicates that the entire shm*(2) library is present.
1856
1857d_shmat (d_shmat.U):
1858 This variable conditionally defines the HAS_SHMAT symbol, which
1859 indicates to the C program that the shmat() routine is available.
1860
1861d_shmatprototype (d_shmat.U):
1862 This variable conditionally defines the HAS_SHMAT_PROTOTYPE
1863 symbol, which indicates that sys/shm.h has a prototype for
1864 shmat.
1865
1866d_shmctl (d_shmctl.U):
1867 This variable conditionally defines the HAS_SHMCTL symbol, which
1868 indicates to the C program that the shmctl() routine is available.
1869
1870d_shmdt (d_shmdt.U):
1871 This variable conditionally defines the HAS_SHMDT symbol, which
1872 indicates to the C program that the shmdt() routine is available.
1873
1874d_shmget (d_shmget.U):
1875 This variable conditionally defines the HAS_SHMGET symbol, which
1876 indicates to the C program that the shmget() routine is available.
1877
1878d_sigaction (d_sigaction.U):
1879 This variable conditionally defines the HAS_SIGACTION symbol, which
1880 indicates that the Vr4 sigaction() routine is available.
1881
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1882d_sigprocmask (d_sigprocmask.U):
1883 This variable conditionally defines HAS_SIGPROCMASK
1884 if sigprocmask() is available to examine or change the signal mask
1885 of the calling process.
1886
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1887d_sigsetjmp (d_sigsetjmp.U):
1888 This variable conditionally defines the HAS_SIGSETJMP symbol,
1889 which indicates that the sigsetjmp() routine is available to
1890 call setjmp() and optionally save the process's signal mask.
1891
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1892d_sockatmark (d_sockatmark.U):
1893 This variable conditionally defines the HAS_SOCKATMARK symbol, which
1894 indicates to the C program that the sockatmark() routine is available.
1895
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1896d_sockatmarkproto (d_sockatmarkproto.U):
1897 This variable conditionally defines the HAS_SOCKATMARK_PROTO symbol,
1898 which indicates to the C program that the system provides
1899 a prototype for the sockatmark() function. Otherwise, it is
1900 up to the program to supply one.
1901
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1902d_socket (d_socket.U):
1903 This variable conditionally defines HAS_SOCKET, which indicates
1904 that the BSD socket interface is supported.
1905
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1906d_socklen_t (d_socklen_t.U):
1907 This symbol will be defined if the C compiler supports socklen_t.
1908
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1909d_sockpair (d_socket.U):
1910 This variable conditionally defines the HAS_SOCKETPAIR symbol, which
1911 indicates that the BSD socketpair() is supported.
1912
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1913d_socks5_init (d_socks5_init.U):
1914 This variable conditionally defines the HAS_SOCKS5_INIT symbol, which
1915 indicates to the C program that the socks5_init() routine is available.
1916
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1917d_sqrtl (d_sqrtl.U):
1918 This variable conditionally defines the HAS_SQRTL symbol, which
1919 indicates to the C program that the sqrtl() routine is available.
1920
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1921d_srand48_r (d_srand48_r.U):
1922 This variable conditionally defines the HAS_SRAND48_R symbol,
1923 which indicates to the C program that the srand48_r()
1924 routine is available.
1925
1926d_srandom_r (d_srandom_r.U):
1927 This variable conditionally defines the HAS_SRANDOM_R symbol,
1928 which indicates to the C program that the srandom_r()
1929 routine is available.
1930
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1931d_sresgproto (d_sresgproto.U):
1932 This variable conditionally defines the HAS_SETRESGID_PROTO symbol,
1933 which indicates to the C program that the system provides
1934 a prototype for the setresgid() function. Otherwise, it is
1935 up to the program to supply one.
1936
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1937d_sresuproto (d_sresuproto.U):
1938 This variable conditionally defines the HAS_SETRESUID_PROTO symbol,
1939 which indicates to the C program that the system provides
1940 a prototype for the setresuid() function. Otherwise, it is
1941 up to the program to supply one.
1942
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1943d_statblks (d_statblks.U):
1944 This variable conditionally defines USE_STAT_BLOCKS
1945 if this system has a stat structure declaring
1946 st_blksize and st_blocks.
1947
ad27e871 1948d_statfs_f_flags (d_statfs_f_flags.U):
0545a864 1949 This variable conditionally defines the HAS_STRUCT_STATFS_F_FLAGS
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1950 symbol, which indicates to struct statfs from has f_flags member.
1951 This kind of struct statfs is coming from sys/mount.h (BSD),
1952 not from sys/statfs.h (SYSV).
1953
ad27e871 1954d_statfs_s (d_statfs_s.U):
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JH
1955 This variable conditionally defines the HAS_STRUCT_STATFS symbol,
1956 which indicates that the struct statfs is supported.
1957
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1958d_statvfs (d_statvfs.U):
1959 This variable conditionally defines the HAS_STATVFS symbol, which
1960 indicates to the C program that the statvfs() routine is available.
1961
1962d_stdio_cnt_lval (d_stdstdio.U):
1963 This variable conditionally defines STDIO_CNT_LVALUE if the
1964 FILE_cnt macro can be used as an lvalue.
1965
1966d_stdio_ptr_lval (d_stdstdio.U):
1967 This variable conditionally defines STDIO_PTR_LVALUE if the
1968 FILE_ptr macro can be used as an lvalue.
1969
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NC
1970d_stdio_ptr_lval_nochange_cnt (d_stdstdio.U):
1971 This symbol is defined if using the FILE_ptr macro as an lvalue
1972 to increase the pointer by n leaves File_cnt(fp) unchanged.
1973
1974d_stdio_ptr_lval_sets_cnt (d_stdstdio.U):
1975 This symbol is defined if using the FILE_ptr macro as an lvalue
1976 to increase the pointer by n has the side effect of decreasing the
1977 value of File_cnt(fp) by n.
1978
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1979d_stdio_stream_array (stdio_streams.U):
1980 This variable tells whether there is an array holding
1981 the stdio streams.
1982
1983d_stdiobase (d_stdstdio.U):
1984 This variable conditionally defines USE_STDIO_BASE if this system
1985 has a FILE structure declaring a usable _base field (or equivalent)
1986 in stdio.h.
1987
1988d_stdstdio (d_stdstdio.U):
1989 This variable conditionally defines USE_STDIO_PTR if this system
1990 has a FILE structure declaring usable _ptr and _cnt fields (or
1991 equivalent) in stdio.h.
1992
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1993d_strchr (d_strchr.U):
1994 This variable conditionally defines HAS_STRCHR if strchr() and
1995 strrchr() are available for string searching.
1996
1997d_strcoll (d_strcoll.U):
1998 This variable conditionally defines HAS_STRCOLL if strcoll() is
1999 available to compare strings using collating information.
2000
2001d_strctcpy (d_strctcpy.U):
2002 This variable conditionally defines the USE_STRUCT_COPY symbol, which
2003 indicates to the C program that this C compiler knows how to copy
2004 structures.
2005
2006d_strerrm (d_strerror.U):
2007 This variable holds what Strerrr is defined as to translate an error
2008 code condition into an error message string. It could be 'strerror'
2009 or a more complex macro emulating strrror with sys_errlist[], or the
2010 "unknown" string when both strerror and sys_errlist are missing.
2011
2012d_strerror (d_strerror.U):
2013 This variable conditionally defines HAS_STRERROR if strerror() is
2014 available to translate error numbers to strings.
2015
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2016d_strerror_r (d_strerror_r.U):
2017 This variable conditionally defines the HAS_STRERROR_R symbol,
2018 which indicates to the C program that the strerror_r()
2019 routine is available.
2020
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2021d_strftime (d_strftime.U):
2022 This variable conditionally defines the HAS_STRFTIME symbol, which
2023 indicates to the C program that the strftime() routine is available.
2024
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MB
2025d_strlcat (d_strlcat.U):
2026 This variable conditionally defines the HAS_STRLCAT symbol, which
2027 indicates to the C program that the strlcat () routine is available.
2028
2029d_strlcpy (d_strlcpy.U):
2030 This variable conditionally defines the HAS_STRLCPY symbol, which
2031 indicates to the C program that the strlcpy () routine is available.
2032
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2033d_strtod (d_strtod.U):
2034 This variable conditionally defines the HAS_STRTOD symbol, which
2035 indicates to the C program that the strtod() routine is available
2036 to provide better numeric string conversion than atof().
2037
2038d_strtol (d_strtol.U):
2039 This variable conditionally defines the HAS_STRTOL symbol, which
2040 indicates to the C program that the strtol() routine is available
2041 to provide better numeric string conversion than atoi() and friends.
2042
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2043d_strtold (d_strtold.U):
2044 This variable conditionally defines the HAS_STRTOLD symbol, which
2045 indicates to the C program that the strtold() routine is available.
2046
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2047d_strtoll (d_strtoll.U):
2048 This variable conditionally defines the HAS_STRTOLL symbol, which
2049 indicates to the C program that the strtoll() routine is available.
2050
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NC
2051d_strtoq (d_strtoq.U):
2052 This variable conditionally defines the HAS_STRTOQ symbol, which
2053 indicates to the C program that the strtoq() routine is available.
2054
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2055d_strtoul (d_strtoul.U):
2056 This variable conditionally defines the HAS_STRTOUL symbol, which
2057 indicates to the C program that the strtoul() routine is available
2058 to provide conversion of strings to unsigned long.
2059
ff935051 2060d_strtoull (d_strtoull.U):
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2061 This variable conditionally defines the HAS_STRTOULL symbol, which
2062 indicates to the C program that the strtoull() routine is available.
2063
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2064d_strtouq (d_strtouq.U):
2065 This variable conditionally defines the HAS_STRTOUQ symbol, which
2066 indicates to the C program that the strtouq() routine is available.
2067
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2068d_strxfrm (d_strxfrm.U):
2069 This variable conditionally defines HAS_STRXFRM if strxfrm() is
2070 available to transform strings.
2071
2072d_suidsafe (d_dosuid.U):
2073 This variable conditionally defines SETUID_SCRIPTS_ARE_SECURE_NOW
2074 if setuid scripts can be secure. This test looks in /dev/fd/.
2075
2076d_symlink (d_symlink.U):
2077 This variable conditionally defines the HAS_SYMLINK symbol, which
2078 indicates to the C program that the symlink() routine is available
2079 to create symbolic links.
2080
2081d_syscall (d_syscall.U):
2082 This variable conditionally defines HAS_SYSCALL if syscall() is
2083 available call arbitrary system calls.
2084
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2085d_syscallproto (d_syscallproto.U):
2086 This variable conditionally defines the HAS_SYSCALL_PROTO symbol,
2087 which indicates to the C program that the system provides
2088 a prototype for the syscall() function. Otherwise, it is
2089 up to the program to supply one.
2090
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2091d_sysconf (d_sysconf.U):
2092 This variable conditionally defines the HAS_SYSCONF symbol, which
2093 indicates to the C program that the sysconf() routine is available
2094 to determine system related limits and options.
2095
2096d_sysernlst (d_strerror.U):
2097 This variable conditionally defines HAS_SYS_ERRNOLIST if sys_errnolist[]
2098 is available to translate error numbers to the symbolic name.
2099
2100d_syserrlst (d_strerror.U):
2101 This variable conditionally defines HAS_SYS_ERRLIST if sys_errlist[] is
2102 available to translate error numbers to strings.
2103
2104d_system (d_system.U):
2105 This variable conditionally defines HAS_SYSTEM if system() is
2106 available to issue a shell command.
2107
2108d_tcgetpgrp (d_tcgtpgrp.U):
2109 This variable conditionally defines the HAS_TCGETPGRP symbol, which
2110 indicates to the C program that the tcgetpgrp() routine is available.
2111 to get foreground process group ID.
2112
2113d_tcsetpgrp (d_tcstpgrp.U):
2114 This variable conditionally defines the HAS_TCSETPGRP symbol, which
2115 indicates to the C program that the tcsetpgrp() routine is available
2116 to set foreground process group ID.
2117
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2118d_telldir (d_readdir.U):
2119 This variable conditionally defines HAS_TELLDIR if telldir() is
2120 available.
2121
2122d_telldirproto (d_telldirproto.U):
2123 This variable conditionally defines the HAS_TELLDIR_PROTO symbol,
2124 which indicates to the C program that the system provides
2125 a prototype for the telldir() function. Otherwise, it is
2126 up to the program to supply one.
2127
2128d_time (d_time.U):
2129 This variable conditionally defines the HAS_TIME symbol, which indicates
2130 that the time() routine exists. The time() routine is normaly
2131 provided on UNIX systems.
2132
2133d_times (d_times.U):
2134 This variable conditionally defines the HAS_TIMES symbol, which indicates
2135 that the times() routine exists. The times() routine is normaly
2136 provided on UNIX systems. You may have to include <sys/times.h>.
2137
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2138d_tm_tm_gmtoff (i_time.U):
2139 This variable conditionally defines HAS_TM_TM_GMTOFF, which indicates
2140 indicates to the C program that the struct tm has the tm_gmtoff field.
2141
2142d_tm_tm_zone (i_time.U):
2143 This variable conditionally defines HAS_TM_TM_ZONE, which indicates
2144 indicates to the C program that the struct tm has the tm_zone field.
2145
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2146d_tmpnam_r (d_tmpnam_r.U):
2147 This variable conditionally defines the HAS_TMPNAM_R symbol,
2148 which indicates to the C program that the tmpnam_r()
2149 routine is available.
2150
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2151d_truncate (d_truncate.U):
2152 This variable conditionally defines HAS_TRUNCATE if truncate() is
2153 available to truncate files.
2154
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2155d_ttyname_r (d_ttyname_r.U):
2156 This variable conditionally defines the HAS_TTYNAME_R symbol,
2157 which indicates to the C program that the ttyname_r()
2158 routine is available.
2159
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2160d_tzname (d_tzname.U):
2161 This variable conditionally defines HAS_TZNAME if tzname[] is
2162 available to access timezone names.
2163
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2164d_u32align (d_u32align.U):
2165 This variable tells whether you must access character data
2166 through U32-aligned pointers.
2167
2168d_ualarm (d_ualarm.U):
2169 This variable conditionally defines the HAS_UALARM symbol, which
2170 indicates to the C program that the ualarm() routine is available.
2171
781b178c
JH
2172d_umask (d_umask.U):
2173 This variable conditionally defines the HAS_UMASK symbol, which
2174 indicates to the C program that the umask() routine is available.
2175 to set and get the value of the file creation mask.
2176
2177d_uname (d_gethname.U):
2178 This variable conditionally defines the HAS_UNAME symbol, which
2179 indicates to the C program that the uname() routine may be
2180 used to derive the host name.
2181
2182d_union_semun (d_union_semun.U):
2183 This variable conditionally defines HAS_UNION_SEMUN if the
2184 union semun is defined by including <sys/sem.h>.
2185
758a5d79
JH
2186d_unordered (d_unordered.U):
2187 This variable conditionally defines the HAS_UNORDERED symbol, which
2188 indicates to the C program that the unordered() routine is available.
2189
bdf33aa7
SP
2190d_unsetenv (d_unsetenv.U):
2191 This variable conditionally defines the HAS_UNSETENV symbol, which
2192 indicates to the C program that the unsetenv () routine is available.
2193
4e0554ec
JH
2194d_usleep (d_usleep.U):
2195 This variable conditionally defines HAS_USLEEP if usleep() is
2196 available to do high granularity sleeps.
2197
5af95cda
JH
2198d_usleepproto (d_usleepproto.U):
2199 This variable conditionally defines the HAS_USLEEP_PROTO symbol,
2200 which indicates to the C program that the system provides
2201 a prototype for the usleep() function. Otherwise, it is
2202 up to the program to supply one.
2203
0545a864
JH
2204d_ustat (d_ustat.U):
2205 This variable conditionally defines HAS_USTAT if ustat() is
2206 available to query file system statistics by dev_t.
2207
526fdc24
MS
2208d_vendorarch (vendorarch.U):
2209 This variable conditionally defined PERL_VENDORARCH.
2210
0617aed7
JH
2211d_vendorbin (vendorbin.U):
2212 This variable conditionally defines PERL_VENDORBIN.
2213
a3635516
JH
2214d_vendorlib (vendorlib.U):
2215 This variable conditionally defines PERL_VENDORLIB.
2216
10305dfa
JH
2217d_vendorscript (vendorscript.U):
2218 This variable conditionally defines PERL_VENDORSCRIPT.
2219
781b178c
JH
2220d_vfork (d_vfork.U):
2221 This variable conditionally defines the HAS_VFORK symbol, which
2222 indicates the vfork() routine is available.
2223
2224d_void_closedir (d_closedir.U):
2225 This variable conditionally defines VOID_CLOSEDIR if closedir()
2226 does not return a value.
2227
2228d_voidsig (d_voidsig.U):
2229 This variable conditionally defines VOIDSIG if this system
2230 declares "void (*signal(...))()" in signal.h. The old way was to
2231 declare it as "int (*signal(...))()".
2232
2233d_voidtty (i_sysioctl.U):
2234 This variable conditionally defines USE_IOCNOTTY to indicate that the
2235 ioctl() call with TIOCNOTTY should be used to void tty association.
2236 Otherwise (on USG probably), it is enough to close the standard file
2237 decriptors and do a setpgrp().
2238
2239d_volatile (d_volatile.U):
2240 This variable conditionally defines the HASVOLATILE symbol, which
2241 indicates to the C program that this C compiler knows about the
2242 volatile declaration.
2243
2244d_vprintf (d_vprintf.U):
2245 This variable conditionally defines the HAS_VPRINTF symbol, which
2246 indicates to the C program that the vprintf() routine is available
2247 to printf with a pointer to an argument list.
2248
2249d_wait4 (d_wait4.U):
2250 This variable conditionally defines the HAS_WAIT4 symbol, which
2251 indicates the wait4() routine is available.
2252
2253d_waitpid (d_waitpid.U):
2254 This variable conditionally defines HAS_WAITPID if waitpid() is
2255 available to wait for child process.
2256
2257d_wcstombs (d_wcstombs.U):
2258 This variable conditionally defines the HAS_WCSTOMBS symbol, which
2259 indicates to the C program that the wcstombs() routine is available
2260 to convert wide character strings to multibyte strings.
2261
2262d_wctomb (d_wctomb.U):
2263 This variable conditionally defines the HAS_WCTOMB symbol, which
2264 indicates to the C program that the wctomb() routine is available
2265 to convert a wide character to a multibyte.
2266
4e0554ec
JH
2267d_writev (d_writev.U):
2268 This variable conditionally defines the HAS_WRITEV symbol, which
2269 indicates to the C program that the writev() routine is available.
2270
781b178c
JH
2271d_xenix (Guess.U):
2272 This variable conditionally defines the symbol XENIX, which alerts
2273 the C program that it runs under Xenix.
2274
2275date (Loc.U):
5bf26616 2276 This variable is used internally by Configure to determine the
781b178c
JH
2277 full pathname (if any) of the date program. After Configure runs,
2278 the value is reset to a plain "date" and is not useful.
2279
2280db_hashtype (i_db.U):
2281 This variable contains the type of the hash structure element
2282 in the <db.h> header file. In older versions of DB, it was
2283 int, while in newer ones it is u_int32_t.
2284
2285db_prefixtype (i_db.U):
2286 This variable contains the type of the prefix structure element
2287 in the <db.h> header file. In older versions of DB, it was
2288 int, while in newer ones it is size_t.
2289
640374d0
JH
2290db_version_major (i_db.U):
2291 This variable contains the major version number of
2292 Berkeley DB found in the <db.h> header file.
2293
2294db_version_minor (i_db.U):
2295 This variable contains the minor version number of
2296 Berkeley DB found in the <db.h> header file.
2297 For DB version 1 this is always 0.
2298
2299db_version_patch (i_db.U):
2300 This variable contains the patch version number of
2301 Berkeley DB found in the <db.h> header file.
2302 For DB version 1 this is always 0.
2303
781b178c
JH
2304defvoidused (voidflags.U):
2305 This variable contains the default value of the VOIDUSED symbol (15).
2306
2307direntrytype (i_dirent.U):
2308 This symbol is set to 'struct direct' or 'struct dirent' depending on
2309 whether dirent is available or not. You should use this pseudo type to
2310 portably declare your directory entries.
2311
2312dlext (dlext.U):
2313 This variable contains the extension that is to be used for the
2314 dynamically loaded modules that perl generaties.
2315
2316dlsrc (dlsrc.U):
2317 This variable contains the name of the dynamic loading file that
2318 will be used with the package.
2319
2320doublesize (doublesize.U):
2321 This variable contains the value of the DOUBLESIZE symbol, which
2322 indicates to the C program how many bytes there are in a double.
2323
2324drand01 (randfunc.U):
2325 Indicates the macro to be used to generate normalized
2326 random numbers. Uses randfunc, often divided by
2327 (double) (((unsigned long) 1 << randbits)) in order to
2328 normalize the result.
2329 In C programs, the macro 'Drand01' is mapped to drand01.
2330
10bc17b6
JH
2331drand48_r_proto (d_drand48_r.U):
2332 This variable encodes the prototype of drand48_r.
39183afa
JH
2333 It is zero if d_drand48_r is undef, and one of the
2334 REENTRANT_PROTO_T_ABC macros of reentr.h if d_drand48_r
2335 is defined.
10bc17b6 2336
781b178c
JH
2337dynamic_ext (Extensions.U):
2338 This variable holds a list of XS extension files we want to
2339 link dynamically into the package. It is used by Makefile.
2340
2341eagain (nblock_io.U):
2342 This variable bears the symbolic errno code set by read() when no
2343 data is present on the file and non-blocking I/O was enabled (otherwise,
2344 read() blocks naturally).
2345
2346ebcdic (ebcdic.U):
2347 This variable conditionally defines EBCDIC if this
2348 system uses EBCDIC encoding. Among other things, this
2349 means that the character ranges are not contiguous.
2350 See trnl.U
2351
2352echo (Loc.U):
5bf26616 2353 This variable is used internally by Configure to determine the
781b178c
JH
2354 full pathname (if any) of the echo program. After Configure runs,
2355 the value is reset to a plain "echo" and is not useful.
2356
2357egrep (Loc.U):
5bf26616 2358 This variable is used internally by Configure to determine the
781b178c
JH
2359 full pathname (if any) of the egrep program. After Configure runs,
2360 the value is reset to a plain "egrep" and is not useful.
2361
2362emacs (Loc.U):
2363 This variable is defined but not used by Configure.
2364 The value is a plain '' and is not useful.
2365
10bc17b6
JH
2366endgrent_r_proto (d_endgrent_r.U):
2367 This variable encodes the prototype of endgrent_r.
39183afa
JH
2368 It is zero if d_endgrent_r is undef, and one of the
2369 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endgrent_r
2370 is defined.
10bc17b6
JH
2371
2372endhostent_r_proto (d_endhostent_r.U):
2373 This variable encodes the prototype of endhostent_r.
39183afa
JH
2374 It is zero if d_endhostent_r is undef, and one of the
2375 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endhostent_r
2376 is defined.
10bc17b6
JH
2377
2378endnetent_r_proto (d_endnetent_r.U):
2379 This variable encodes the prototype of endnetent_r.
39183afa
JH
2380 It is zero if d_endnetent_r is undef, and one of the
2381 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endnetent_r
2382 is defined.
10bc17b6
JH
2383
2384endprotoent_r_proto (d_endprotoent_r.U):
2385 This variable encodes the prototype of endprotoent_r.
39183afa
JH
2386 It is zero if d_endprotoent_r is undef, and one of the
2387 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endprotoent_r
2388 is defined.
10bc17b6
JH
2389
2390endpwent_r_proto (d_endpwent_r.U):
2391 This variable encodes the prototype of endpwent_r.
39183afa
JH
2392 It is zero if d_endpwent_r is undef, and one of the
2393 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endpwent_r
2394 is defined.
10bc17b6
JH
2395
2396endservent_r_proto (d_endservent_r.U):
2397 This variable encodes the prototype of endservent_r.
39183afa
JH
2398 It is zero if d_endservent_r is undef, and one of the
2399 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endservent_r
2400 is defined.
10bc17b6 2401
781b178c
JH
2402eunicefix (Init.U):
2403 When running under Eunice this variable contains a command which will
2404 convert a shell script to the proper form of text file for it to be
2405 executable by the shell. On other systems it is a no-op.
2406
2407exe_ext (Unix.U):
2408 This is an old synonym for _exe.
2409
2410expr (Loc.U):
5bf26616 2411 This variable is used internally by Configure to determine the
781b178c
JH
2412 full pathname (if any) of the expr program. After Configure runs,
2413 the value is reset to a plain "expr" and is not useful.
2414
2415extensions (Extensions.U):
2416 This variable holds a list of all extension files (both XS and
2417 non-xs linked into the package. It is propagated to Config.pm
2418 and is typically used to test whether a particular extesion
2419 is available.
2420
cb7ddd31
JH
2421extras (Extras.U):
2422 This variable holds a list of extra modules to install.
2423
781b178c
JH
2424fflushall (fflushall.U):
2425 This symbol, if defined, tells that to flush
2426 all pending stdio output one must loop through all
2427 the stdio file handles stored in an array and fflush them.
2428 Note that if fflushNULL is defined, fflushall will not
2429 even be probed for and will be left undefined.
2430
4d54317a
JH
2431fflushNULL (fflushall.U):
2432 This symbol, if defined, tells that fflush(NULL) does flush
2433 all pending stdio output.
2434
781b178c 2435find (Loc.U):
ff935051
JH
2436 This variable is defined but not used by Configure.
2437 The value is a plain '' and is not useful.
781b178c
JH
2438
2439firstmakefile (Unix.U):
2440 This variable defines the first file searched by make. On unix,
2441 it is makefile (then Makefile). On case-insensitive systems,
2442 it might be something else. This is only used to deal with
2443 convoluted make depend tricks.
2444
2445flex (Loc.U):
2446 This variable is defined but not used by Configure.
2447 The value is a plain '' and is not useful.
2448
a22e52b9
JH
2449fpossize (fpossize.U):
2450 This variable contains the size of a fpostype in bytes.
2451
781b178c 2452fpostype (fpostype.U):
a22e52b9 2453 This variable defines Fpos_t to be something like fpos_t, long,
781b178c
JH
2454 uint, or whatever type is used to declare file positions in libc.
2455
2456freetype (mallocsrc.U):
2457 This variable contains the return type of free(). It is usually
2458 void, but occasionally int.
2459
5440bc8e
JH
2460from (Cross.U):
2461 This variable contains the command used by Configure
2462 to copy files from the target host. Useful and available
2463 only during Perl build.
2464 The string ':' if not cross-compiling.
2465
781b178c
JH
2466full_ar (Loc_ar.U):
2467 This variable contains the full pathname to 'ar', whether or
2468 not the user has specified 'portability'. This is only used
2469 in the Makefile.SH.
2470
2471full_csh (d_csh.U):
2472 This variable contains the full pathname to 'csh', whether or
2473 not the user has specified 'portability'. This is only used
2474 in the compiled C program, and we assume that all systems which
2475 can share this executable will have the same full pathname to
2476 'csh.'
2477
2478full_sed (Loc_sed.U):
2479 This variable contains the full pathname to 'sed', whether or
2480 not the user has specified 'portability'. This is only used
2481 in the compiled C program, and we assume that all systems which
2482 can share this executable will have the same full pathname to
2483 'sed.'
2484
123f32c0
MB
2485gccansipedantic (gccvers.U):
2486 If GNU cc (gcc) is used, this variable will enable (if set) the
2487 -ansi and -pedantic ccflags for building core files (through
2488 cflags script). (See Porting/pumpkin.pod for full description).
2489
af960fef 2490gccosandvers (gccvers.U):
123f32c0
MB
2491 If GNU cc (gcc) is used, this variable holds the operating system
2492 and version used to compile gcc. It is set to '' if not gcc,
af960fef
JH
2493 or if nothing useful can be parsed as the os version.
2494
2495gccversion (gccvers.U):
123f32c0 2496 If GNU cc (gcc) is used, this variable holds '1' or '2' to
781b178c
JH
2497 indicate whether the compiler is version 1 or 2. This is used in
2498 setting some of the default cflags. It is set to '' if not gcc.
2499
10bc17b6
JH
2500getgrent_r_proto (d_getgrent_r.U):
2501 This variable encodes the prototype of getgrent_r.
39183afa
JH
2502 It is zero if d_getgrent_r is undef, and one of the
2503 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrent_r
2504 is defined.
10bc17b6
JH
2505
2506getgrgid_r_proto (d_getgrgid_r.U):
2507 This variable encodes the prototype of getgrgid_r.
39183afa
JH
2508 It is zero if d_getgrgid_r is undef, and one of the
2509 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrgid_r
2510 is defined.
10bc17b6
JH
2511
2512getgrnam_r_proto (d_getgrnam_r.U):
2513 This variable encodes the prototype of getgrnam_r.
39183afa
JH
2514 It is zero if d_getgrnam_r is undef, and one of the
2515 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrnam_r
2516 is defined.
10bc17b6
JH
2517
2518gethostbyaddr_r_proto (d_gethostbyaddr_r.U):
2519 This variable encodes the prototype of gethostbyaddr_r.
39183afa
JH
2520 It is zero if d_gethostbyaddr_r is undef, and one of the
2521 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyaddr_r
2522 is defined.
10bc17b6
JH
2523
2524gethostbyname_r_proto (d_gethostbyname_r.U):
2525 This variable encodes the prototype of gethostbyname_r.
39183afa
JH
2526 It is zero if d_gethostbyname_r is undef, and one of the
2527 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyname_r
2528 is defined.
10bc17b6
JH
2529
2530gethostent_r_proto (d_gethostent_r.U):
2531 This variable encodes the prototype of gethostent_r.
39183afa
JH
2532 It is zero if d_gethostent_r is undef, and one of the
2533 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostent_r
2534 is defined.
10bc17b6
JH
2535
2536getlogin_r_proto (d_getlogin_r.U):
2537 This variable encodes the prototype of getlogin_r.
39183afa
JH
2538 It is zero if d_getlogin_r is undef, and one of the
2539 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getlogin_r
2540 is defined.
10bc17b6
JH
2541
2542getnetbyaddr_r_proto (d_getnetbyaddr_r.U):
2543 This variable encodes the prototype of getnetbyaddr_r.
39183afa
JH
2544 It is zero if d_getnetbyaddr_r is undef, and one of the
2545 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyaddr_r
2546 is defined.
10bc17b6
JH
2547
2548getnetbyname_r_proto (d_getnetbyname_r.U):
2549 This variable encodes the prototype of getnetbyname_r.
39183afa
JH
2550 It is zero if d_getnetbyname_r is undef, and one of the
2551 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyname_r
2552 is defined.
10bc17b6
JH
2553
2554getnetent_r_proto (d_getnetent_r.U):
2555 This variable encodes the prototype of getnetent_r.
39183afa
JH
2556 It is zero if d_getnetent_r is undef, and one of the
2557 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetent_r
2558 is defined.
10bc17b6
JH
2559
2560getprotobyname_r_proto (d_getprotobyname_r.U):
2561 This variable encodes the prototype of getprotobyname_r.
39183afa
JH
2562 It is zero if d_getprotobyname_r is undef, and one of the
2563 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobyname_r
2564 is defined.
10bc17b6
JH
2565
2566getprotobynumber_r_proto (d_getprotobynumber_r.U):
2567 This variable encodes the prototype of getprotobynumber_r.
39183afa
JH
2568 It is zero if d_getprotobynumber_r is undef, and one of the
2569 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobynumber_r
2570 is defined.
10bc17b6
JH
2571
2572getprotoent_r_proto (d_getprotoent_r.U):
2573 This variable encodes the prototype of getprotoent_r.
39183afa
JH
2574 It is zero if d_getprotoent_r is undef, and one of the
2575 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotoent_r
2576 is defined.
10bc17b6
JH
2577
2578getpwent_r_proto (d_getpwent_r.U):
2579 This variable encodes the prototype of getpwent_r.
39183afa
JH
2580 It is zero if d_getpwent_r is undef, and one of the
2581 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwent_r
2582 is defined.
10bc17b6
JH
2583
2584getpwnam_r_proto (d_getpwnam_r.U):
2585 This variable encodes the prototype of getpwnam_r.
39183afa
JH
2586 It is zero if d_getpwnam_r is undef, and one of the
2587 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwnam_r
2588 is defined.
10bc17b6
JH
2589
2590getpwuid_r_proto (d_getpwuid_r.U):
2591 This variable encodes the prototype of getpwuid_r.
39183afa
JH
2592 It is zero if d_getpwuid_r is undef, and one of the
2593 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwuid_r
2594 is defined.
10bc17b6
JH
2595
2596getservbyname_r_proto (d_getservbyname_r.U):
2597 This variable encodes the prototype of getservbyname_r.
39183afa
JH
2598 It is zero if d_getservbyname_r is undef, and one of the
2599 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyname_r
2600 is defined.
10bc17b6
JH
2601
2602getservbyport_r_proto (d_getservbyport_r.U):
2603 This variable encodes the prototype of getservbyport_r.
39183afa
JH
2604 It is zero if d_getservbyport_r is undef, and one of the
2605 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyport_r
2606 is defined.
10bc17b6
JH
2607
2608getservent_r_proto (d_getservent_r.U):
2609 This variable encodes the prototype of getservent_r.
39183afa
JH
2610 It is zero if d_getservent_r is undef, and one of the
2611 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservent_r
2612 is defined.
10bc17b6
JH
2613
2614getspnam_r_proto (d_getspnam_r.U):
2615 This variable encodes the prototype of getspnam_r.
39183afa
JH
2616 It is zero if d_getspnam_r is undef, and one of the
2617 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getspnam_r
2618 is defined.
10bc17b6 2619
a22e52b9
JH
2620gidformat (gidf.U):
2621 This variable contains the format string used for printing a Gid_t.
2622
785fb66b
JH
2623gidsign (gidsign.U):
2624 This variable contains the signedness of a gidtype.
2625 1 for unsigned, -1 for signed.
2626
2627gidsize (gidsize.U):
2628 This variable contains the size of a gidtype in bytes.
2629
781b178c
JH
2630gidtype (gidtype.U):
2631 This variable defines Gid_t to be something like gid_t, int,
2632 ushort, or whatever type is used to declare the return type
2633 of getgid(). Typically, it is the type of group ids in the kernel.
2634
2635glibpth (libpth.U):
2636 This variable holds the general path (space-separated) used to
2637 find libraries. It may contain directories that do not exist on
2638 this platform, libpth is the cleaned-up version.
2639
c68a00c0
JH
2640gmake (Loc.U):
2641 This variable is used internally by Configure to determine the
2642 full pathname (if any) of the gmake program. After Configure runs,
2643 the value is reset to a plain "gmake" and is not useful.
2644
10bc17b6
JH
2645gmtime_r_proto (d_gmtime_r.U):
2646 This variable encodes the prototype of gmtime_r.
39183afa
JH
2647 It is zero if d_gmtime_r is undef, and one of the
2648 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gmtime_r
2649 is defined.
10bc17b6 2650
00fac743
JH
2651gnulibc_version (d_gnulibc.U):
2652 This variable contains the version number of the GNU C library.
2653 It is usually something like '2.2.5'. It is a plain '' if this
2654 is not the GNU C library, or if the version is unknown.
2655
781b178c 2656grep (Loc.U):
5bf26616 2657 This variable is used internally by Configure to determine the
781b178c
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2658 full pathname (if any) of the grep program. After Configure runs,
2659 the value is reset to a plain "grep" and is not useful.
2660
2661groupcat (nis.U):
2662 This variable contains a command that produces the text of the
2663 /etc/group file. This is normally "cat /etc/group", but can be
2664 "ypcat group" when NIS is used.
aaacdc8b
GS
2665 On some systems, such as os390, there may be no equivalent
2666 command, in which case this variable is unset.
781b178c
JH
2667
2668groupstype (groupstype.U):
2669 This variable defines Groups_t to be something like gid_t, int,
2670 ushort, or whatever type is used for the second argument to
2671 getgroups() and setgroups(). Usually, this is the same as
2672 gidtype (gid_t), but sometimes it isn't.
2673
2674gzip (Loc.U):
5bf26616 2675 This variable is used internally by Configure to determine the
781b178c
JH
2676 full pathname (if any) of the gzip program. After Configure runs,
2677 the value is reset to a plain "gzip" and is not useful.
2678
2679h_fcntl (h_fcntl.U):
2680 This is variable gets set in various places to tell i_fcntl that
2681 <fcntl.h> should be included.
2682
2683h_sysfile (h_sysfile.U):
2684 This is variable gets set in various places to tell i_sys_file that
2685 <sys/file.h> should be included.
2686
2687hint (Oldconfig.U):
2688 Gives the type of hints used for previous answers. May be one of
2689 "default", "recommended" or "previous".
2690
2691hostcat (nis.U):
2692 This variable contains a command that produces the text of the
2693 /etc/hosts file. This is normally "cat /etc/hosts", but can be
2694 "ypcat hosts" when NIS is used.
aaacdc8b
GS
2695 On some systems, such as os390, there may be no equivalent
2696 command, in which case this variable is unset.
781b178c 2697
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2698html1dir (html1dir.U):
2699 This variable contains the name of the directory in which html
2700 source pages are to be put. This directory is for pages
2701 that describe whole programs, not libraries or modules. It
2702 is intended to correspond roughly to section 1 of the Unix
2703 manuals.
2704
2705html1direxp (html1dir.U):
2706 This variable is the same as the html1dir variable, but is filename
2707 expanded at configuration time, for convenient use in makefiles.
2708
2709html3dir (html3dir.U):
2710 This variable contains the name of the directory in which html
2711 source pages are to be put. This directory is for pages
2712 that describe libraries or modules. It is intended to
2713 correspond roughly to section 3 of the Unix manuals.
2714
2715html3direxp (html3dir.U):
2716 This variable is the same as the html3dir variable, but is filename
2717 expanded at configuration time, for convenient use in makefiles.
2718
a22e52b9
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2719i16size (perlxv.U):
2720 This variable is the size of an I16 in bytes.
2721
2722i16type (perlxv.U):
2723 This variable contains the C type used for Perl's I16.
2724
2725i32size (perlxv.U):
2726 This variable is the size of an I32 in bytes.
2727
2728i32type (perlxv.U):
2729 This variable contains the C type used for Perl's I32.
2730
2731i64size (perlxv.U):
2732 This variable is the size of an I64 in bytes.
2733
2734i64type (perlxv.U):
2735 This variable contains the C type used for Perl's I64.
2736
2737i8size (perlxv.U):
2738 This variable is the size of an I8 in bytes.
2739
2740i8type (perlxv.U):
2741 This variable contains the C type used for Perl's I8.
2742
781b178c
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2743i_arpainet (i_arpainet.U):
2744 This variable conditionally defines the I_ARPA_INET symbol,
2745 and indicates whether a C program should include <arpa/inet.h>.
2746
2747i_bsdioctl (i_sysioctl.U):
2748 This variable conditionally defines the I_SYS_BSDIOCTL symbol, which
2749 indicates to the C program that <sys/bsdioctl.h> exists and should
2750 be included.
2751
10bc17b6
JH
2752i_crypt (i_crypt.U):
2753 This variable conditionally defines the I_CRYPT symbol, and indicates
2754 whether a C program should include <crypt.h>.
2755
781b178c
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2756i_db (i_db.U):
2757 This variable conditionally defines the I_DB symbol, and indicates
2758 whether a C program may include Berkeley's DB include file <db.h>.
2759
2760i_dbm (i_dbm.U):
2761 This variable conditionally defines the I_DBM symbol, which
2762 indicates to the C program that <dbm.h> exists and should
2763 be included.
2764
2765i_dirent (i_dirent.U):
2766 This variable conditionally defines I_DIRENT, which indicates
2767 to the C program that it should include <dirent.h>.
2768
2769i_dld (i_dld.U):
2770 This variable conditionally defines the I_DLD symbol, which
2771 indicates to the C program that <dld.h> (GNU dynamic loading)
2772 exists and should be included.
2773
2774i_dlfcn (i_dlfcn.U):
2775 This variable conditionally defines the I_DLFCN symbol, which
2776 indicates to the C program that <dlfcn.h> exists and should
2777 be included.
2778
2779i_fcntl (i_fcntl.U):
2780 This variable controls the value of I_FCNTL (which tells
2781 the C program to include <fcntl.h>).
2782
2783i_float (i_float.U):
2784 This variable conditionally defines the I_FLOAT symbol, and indicates
2785 whether a C program may include <float.h> to get symbols like DBL_MAX
2786 or DBL_MIN, i.e. machine dependent floating point values.
2787
758a5d79
JH
2788i_fp (i_fp.U):
2789 This variable conditionally defines the I_FP symbol, and indicates
2790 whether a C program should include <fp.h>.
2791
2792i_fp_class (i_fp_class.U):
2793 This variable conditionally defines the I_FP_CLASS symbol, and indicates
2794 whether a C program should include <fp_class.h>.
2795
781b178c
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2796i_gdbm (i_gdbm.U):
2797 This variable conditionally defines the I_GDBM symbol, which
2798 indicates to the C program that <gdbm.h> exists and should
2799 be included.
2800
2801i_grp (i_grp.U):
2802 This variable conditionally defines the I_GRP symbol, and indicates
2803 whether a C program should include <grp.h>.
2804
792d8dab
JH
2805i_ieeefp (i_ieeefp.U):
2806 This variable conditionally defines the I_IEEEFP symbol, and indicates
2807 whether a C program should include <ieeefp.h>.
2808
781b178c
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2809i_inttypes (i_inttypes.U):
2810 This variable conditionally defines the I_INTTYPES symbol,
2811 and indicates whether a C program should include <inttypes.h>.
2812
2765b840
JH
2813i_langinfo (i_langinfo.U):
2814 This variable conditionally defines the I_LANGINFO symbol,
2815 and indicates whether a C program should include <langinfo.h>.
2816
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JH
2817i_libutil (i_libutil.U):
2818 This variable conditionally defines the I_LIBUTIL symbol, and indicates
2819 whether a C program should include <libutil.h>.
2820
781b178c
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2821i_limits (i_limits.U):
2822 This variable conditionally defines the I_LIMITS symbol, and indicates
2823 whether a C program may include <limits.h> to get symbols like WORD_BIT
2824 and friends.
2825
2826i_locale (i_locale.U):
2827 This variable conditionally defines the I_LOCALE symbol,
2828 and indicates whether a C program should include <locale.h>.
2829
2830i_machcthr (i_machcthr.U):
2831 This variable conditionally defines the I_MACH_CTHREADS symbol,
2832 and indicates whether a C program should include <mach/cthreads.h>.
2833
2834i_malloc (i_malloc.U):
2835 This variable conditionally defines the I_MALLOC symbol, and indicates
2836 whether a C program should include <malloc.h>.
2837
2838i_math (i_math.U):
2839 This variable conditionally defines the I_MATH symbol, and indicates
2840 whether a C program may include <math.h>.
2841
2842i_memory (i_memory.U):
2843 This variable conditionally defines the I_MEMORY symbol, and indicates
2844 whether a C program should include <memory.h>.
2845
2846i_mntent (i_mntent.U):
2847 This variable conditionally defines the I_MNTENT symbol, and indicates
2848 whether a C program should include <mntent.h>.
2849
2850i_ndbm (i_ndbm.U):
2851 This variable conditionally defines the I_NDBM symbol, which
2852 indicates to the C program that <ndbm.h> exists and should
2853 be included.
2854
2855i_netdb (i_netdb.U):
2856 This variable conditionally defines the I_NETDB symbol, and indicates
2857 whether a C program should include <netdb.h>.
2858
2859i_neterrno (i_neterrno.U):
2860 This variable conditionally defines the I_NET_ERRNO symbol, which
2861 indicates to the C program that <net/errno.h> exists and should
2862 be included.
2863
2864i_netinettcp (i_netinettcp.U):
2865 This variable conditionally defines the I_NETINET_TCP symbol,
2866 and indicates whether a C program should include <netinet/tcp.h>.
2867
2868i_niin (i_niin.U):
2869 This variable conditionally defines I_NETINET_IN, which indicates
2870 to the C program that it should include <netinet/in.h>. Otherwise,
2871 you may try <sys/in.h>.
2872
2873i_poll (i_poll.U):
2874 This variable conditionally defines the I_POLL symbol, and indicates
2875 whether a C program should include <poll.h>.
2876
3813c136
JH
2877i_prot (i_prot.U):
2878 This variable conditionally defines the I_PROT symbol, and indicates
2879 whether a C program should include <prot.h>.
2880
781b178c 2881i_pthread (i_pthread.U):
190b66db 2882 This variable conditionally defines the I_PTHREAD symbol,
781b178c
JH
2883 and indicates whether a C program should include <pthread.h>.
2884
2885i_pwd (i_pwd.U):
2886 This variable conditionally defines I_PWD, which indicates
2887 to the C program that it should include <pwd.h>.
2888
2889i_rpcsvcdbm (i_dbm.U):
2890 This variable conditionally defines the I_RPCSVC_DBM symbol, which
2891 indicates to the C program that <rpcsvc/dbm.h> exists and should
2892 be included. Some System V systems might need this instead of <dbm.h>.
2893
2894i_sfio (i_sfio.U):
2895 This variable conditionally defines the I_SFIO symbol,
2896 and indicates whether a C program should include <sfio.h>.
2897
2898i_sgtty (i_termio.U):
2899 This variable conditionally defines the I_SGTTY symbol, which
2900 indicates to the C program that it should include <sgtty.h> rather
2901 than <termio.h>.
2902
2903i_shadow (i_shadow.U):
2904 This variable conditionally defines the I_SHADOW symbol, and indicates
2905 whether a C program should include <shadow.h>.
2906
2907i_socks (i_socks.U):
2908 This variable conditionally defines the I_SOCKS symbol, and indicates
2909 whether a C program should include <socks.h>.
2910
2911i_stdarg (i_varhdr.U):
2912 This variable conditionally defines the I_STDARG symbol, which
2913 indicates to the C program that <stdarg.h> exists and should
2914 be included.
2915
2916i_stddef (i_stddef.U):
2917 This variable conditionally defines the I_STDDEF symbol, which
2918 indicates to the C program that <stddef.h> exists and should
2919 be included.
2920
2921i_stdlib (i_stdlib.U):
2922 This variable conditionally defines the I_STDLIB symbol, which
2923 indicates to the C program that <stdlib.h> exists and should
2924 be included.
2925
2926i_string (i_string.U):
2927 This variable conditionally defines the I_STRING symbol, which
2928 indicates that <string.h> should be included rather than <strings.h>.
2929
792d8dab
JH
2930i_sunmath (i_sunmath.U):
2931 This variable conditionally defines the I_SUNMATH symbol, and indicates
2932 whether a C program should include <sunmath.h>.
2933
781b178c
JH
2934i_sysaccess (i_sysaccess.U):
2935 This variable conditionally defines the I_SYS_ACCESS symbol,
2936 and indicates whether a C program should include <sys/access.h>.
2937
2938i_sysdir (i_sysdir.U):
2939 This variable conditionally defines the I_SYS_DIR symbol, and indicates
2940 whether a C program should include <sys/dir.h>.
2941
2942i_sysfile (i_sysfile.U):
2943 This variable conditionally defines the I_SYS_FILE symbol, and indicates
2944 whether a C program should include <sys/file.h> to get R_OK and friends.
2945
2946i_sysfilio (i_sysioctl.U):
2947 This variable conditionally defines the I_SYS_FILIO symbol, which
2948 indicates to the C program that <sys/filio.h> exists and should
2949 be included in preference to <sys/ioctl.h>.
2950
2951i_sysin (i_niin.U):
2952 This variable conditionally defines I_SYS_IN, which indicates
2953 to the C program that it should include <sys/in.h> instead of
2954 <netinet/in.h>.
2955
2956i_sysioctl (i_sysioctl.U):
2957 This variable conditionally defines the I_SYS_IOCTL symbol, which
2958 indicates to the C program that <sys/ioctl.h> exists and should
2959 be included.
2960
ca52efda
JH
2961i_syslog (i_syslog.U):
2962 This variable conditionally defines the I_SYSLOG symbol,
2963 and indicates whether a C program should include <syslog.h>.
2964
fe749a9f
JH
2965i_sysmman (i_sysmman.U):
2966 This variable conditionally defines the I_SYS_MMAN symbol, and
2967 indicates whether a C program should include <sys/mman.h>.
2968
87b71857
JH
2969i_sysmode (i_sysmode.U):
2970 This variable conditionally defines the I_SYSMODE symbol,
2971 and indicates whether a C program should include <sys/mode.h>.
2972
781b178c
JH
2973i_sysmount (i_sysmount.U):
2974 This variable conditionally defines the I_SYSMOUNT symbol,
2975 and indicates whether a C program should include <sys/mount.h>.
2976
2977i_sysndir (i_sysndir.U):
2978 This variable conditionally defines the I_SYS_NDIR symbol, and indicates
2979 whether a C program should include <sys/ndir.h>.
2980
2981i_sysparam (i_sysparam.U):
2982 This variable conditionally defines the I_SYS_PARAM symbol, and indicates
2983 whether a C program should include <sys/param.h>.
2984
2985i_sysresrc (i_sysresrc.U):
2986 This variable conditionally defines the I_SYS_RESOURCE symbol,
2987 and indicates whether a C program should include <sys/resource.h>.
2988
2989i_syssecrt (i_syssecrt.U):
2990 This variable conditionally defines the I_SYS_SECURITY symbol,
2991 and indicates whether a C program should include <sys/security.h>.
2992
2993i_sysselct (i_sysselct.U):
2994 This variable conditionally defines I_SYS_SELECT, which indicates
2995 to the C program that it should include <sys/select.h> in order to
2996 get the definition of struct timeval.
2997
2998i_syssockio (i_sysioctl.U):
2999 This variable conditionally defines I_SYS_SOCKIO to indicate to the
3000 C program that socket ioctl codes may be found in <sys/sockio.h>
3001 instead of <sys/ioctl.h>.
3002
3003i_sysstat (i_sysstat.U):
3004 This variable conditionally defines the I_SYS_STAT symbol,
3005 and indicates whether a C program should include <sys/stat.h>.
3006
0545a864
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3007i_sysstatfs (i_sysstatfs.U):
3008 This variable conditionally defines the I_SYSSTATFS symbol,
3009 and indicates whether a C program should include <sys/statfs.h>.
3010
781b178c
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3011i_sysstatvfs (i_sysstatvfs.U):
3012 This variable conditionally defines the I_SYSSTATVFS symbol,
3013 and indicates whether a C program should include <sys/statvfs.h>.
3014
3015i_systime (i_time.U):
3016 This variable conditionally defines I_SYS_TIME, which indicates
3017 to the C program that it should include <sys/time.h>.
3018
3019i_systimek (i_time.U):
3020 This variable conditionally defines I_SYS_TIME_KERNEL, which
3021 indicates to the C program that it should include <sys/time.h>
3022 with KERNEL defined.
3023
3024i_systimes (i_systimes.U):
3025 This variable conditionally defines the I_SYS_TIMES symbol, and indicates
3026 whether a C program should include <sys/times.h>.
3027
3028i_systypes (i_systypes.U):
3029 This variable conditionally defines the I_SYS_TYPES symbol,
3030 and indicates whether a C program should include <sys/types.h>.
3031
3032i_sysuio (i_sysuio.U):
3033 This variable conditionally defines the I_SYSUIO symbol, and indicates
3034 whether a C program should include <sys/uio.h>.
3035
3036i_sysun (i_sysun.U):
3037 This variable conditionally defines I_SYS_UN, which indicates
3038 to the C program that it should include <sys/un.h> to get UNIX
3039 domain socket definitions.
3040
d4935d7f
JH
3041i_sysutsname (i_sysutsname.U):
3042 This variable conditionally defines the I_SYSUTSNAME symbol,
3043 and indicates whether a C program should include <sys/utsname.h>.
3044
0545a864
JH
3045i_sysvfs (i_sysvfs.U):
3046 This variable conditionally defines the I_SYSVFS symbol,
3047 and indicates whether a C program should include <sys/vfs.h>.
3048
781b178c
JH
3049i_syswait (i_syswait.U):
3050 This variable conditionally defines I_SYS_WAIT, which indicates
3051 to the C program that it should include <sys/wait.h>.
3052
3053i_termio (i_termio.U):
3054 This variable conditionally defines the I_TERMIO symbol, which
3055 indicates to the C program that it should include <termio.h> rather
3056 than <sgtty.h>.
3057
3058i_termios (i_termio.U):
3059 This variable conditionally defines the I_TERMIOS symbol, which
3060 indicates to the C program that the POSIX <termios.h> file is
3061 to be included.
3062
3063i_time (i_time.U):
3064 This variable conditionally defines I_TIME, which indicates
3065 to the C program that it should include <time.h>.
3066
3067i_unistd (i_unistd.U):
3068 This variable conditionally defines the I_UNISTD symbol, and indicates
3069 whether a C program should include <unistd.h>.
3070
0545a864
JH
3071i_ustat (i_ustat.U):
3072 This variable conditionally defines the I_USTAT symbol, and indicates
3073 whether a C program should include <ustat.h>.
3074
781b178c
JH
3075i_utime (i_utime.U):
3076 This variable conditionally defines the I_UTIME symbol, and indicates
3077 whether a C program should include <utime.h>.
3078
3079i_values (i_values.U):
3080 This variable conditionally defines the I_VALUES symbol, and indicates
3081 whether a C program may include <values.h> to get symbols like MAXLONG
3082 and friends.
3083
3084i_varargs (i_varhdr.U):
3085 This variable conditionally defines I_VARARGS, which indicates
3086 to the C program that it should include <varargs.h>.
3087
3088i_varhdr (i_varhdr.U):
3089 Contains the name of the header to be included to get va_dcl definition.
3090 Typically one of varargs.h or stdarg.h.
3091
3092i_vfork (i_vfork.U):
3093 This variable conditionally defines the I_VFORK symbol, and indicates
3094 whether a C program should include vfork.h.
3095
3096ignore_versioned_solibs (libs.U):
3097 This variable should be non-empty if non-versioned shared
3098 libraries (libfoo.so.x.y) are to be ignored (because they
3099 cannot be linked against).
3100
ff935051
JH
3101inc_version_list (inc_version_list.U):
3102 This variable specifies the list of subdirectories in over
3103 which perl.c:incpush() and lib/lib.pm will automatically
3a096bf3
JH
3104 search when adding directories to @INC. The elements in
3105 the list are separated by spaces. This is only useful
ff935051
JH
3106 if you have a perl library directory tree structured like the
3107 default one. See INSTALL for how this works. The versioned
3108 site_perl directory was introduced in 5.005, so that is the
3109 lowest possible value.
3110
3a096bf3
JH
3111inc_version_list_init (inc_version_list.U):
3112 This variable holds the same list as inc_version_list, but
3113 each item is enclosed in double quotes and separated by commas,
3114 suitable for use in the PERL_INC_VERSION_LIST initialization.
3115
781b178c 3116incpath (usrinc.U):
209e5c0a
JH
3117 This variable must preceed the normal include path to get hte
3118 right one, as in "$incpath/usr/include" or "$incpath/usr/lib".
781b178c
JH
3119 Value can be "" or "/bsd43" on mips.
3120
3121inews (Loc.U):
3122 This variable is defined but not used by Configure.
3123 The value is a plain '' and is not useful.
3124
3125installarchlib (archlib.U):
3126 This variable is really the same as archlibexp but may differ on
3127 those systems using AFS. For extra portability, only this variable
3128 should be used in makefiles.
3129
3130installbin (bin.U):
3131 This variable is the same as binexp unless AFS is running in which case
3132 the user is explicitely prompted for it. This variable should always
3133 be used in your makefiles for maximum portability.
3134
10305dfa
JH
3135installhtml1dir (html1dir.U):
3136 This variable is really the same as html1direxp, unless you are
3137 using a different installprefix. For extra portability, you
3138 should only use this variable within your makefiles.
3139
3140installhtml3dir (html3dir.U):
3141 This variable is really the same as html3direxp, unless you are
3142 using a different installprefix. For extra portability, you
3143 should only use this variable within your makefiles.
3144
781b178c
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3145installman1dir (man1dir.U):
3146 This variable is really the same as man1direxp, unless you are using
3147 AFS in which case it points to the read/write location whereas
3148 man1direxp only points to the read-only access location. For extra
3149 portability, you should only use this variable within your makefiles.
3150
3151installman3dir (man3dir.U):
3152 This variable is really the same as man3direxp, unless you are using
3153 AFS in which case it points to the read/write location whereas
3154 man3direxp only points to the read-only access location. For extra
3155 portability, you should only use this variable within your makefiles.
3156
3157installprefix (installprefix.U):
3158 This variable holds the name of the directory below which
3159 "make install" will install the package. For most users, this
3160 is the same as prefix. However, it is useful for
3161 installing the software into a different (usually temporary)
3162 location after which it can be bundled up and moved somehow
3163 to the final location specified by prefix.
3164
3165installprefixexp (installprefix.U):
3166 This variable holds the full absolute path of installprefix
3167 with all ~-expansion done.
3168
3169installprivlib (privlib.U):
3170 This variable is really the same as privlibexp but may differ on
3171 those systems using AFS. For extra portability, only this variable
3172 should be used in makefiles.
3173
3174installscript (scriptdir.U):
3175 This variable is usually the same as scriptdirexp, unless you are on
3176 a system running AFS, in which case they may differ slightly. You
3177 should always use this variable within your makefiles for portability.
3178
3179installsitearch (sitearch.U):
3180 This variable is really the same as sitearchexp but may differ on
3181 those systems using AFS. For extra portability, only this variable
3182 should be used in makefiles.
3183
0617aed7
JH
3184installsitebin (sitebin.U):
3185 This variable is usually the same as sitebinexp, unless you are on
3186 a system running AFS, in which case they may differ slightly. You
3187 should always use this variable within your makefiles for portability.
3188
e755722e
JH
3189installsitehtml1dir (sitehtml1dir.U):
3190 This variable is really the same as sitehtml1direxp, unless you are using
10305dfa
JH
3191 AFS in which case it points to the read/write location whereas
3192 html1direxp only points to the read-only access location. For extra
3193 portability, you should only use this variable within your makefiles.
3194
e755722e
JH
3195installsitehtml3dir (sitehtml3dir.U):
3196 This variable is really the same as sitehtml3direxp, unless you are using
10305dfa
JH
3197 AFS in which case it points to the read/write location whereas
3198 html3direxp only points to the read-only access location. For extra
3199 portability, you should only use this variable within your makefiles.
3200
781b178c
JH
3201installsitelib (sitelib.U):
3202 This variable is really the same as sitelibexp but may differ on
3203 those systems using AFS. For extra portability, only this variable
3204 should be used in makefiles.
3205
e755722e
JH
3206installsiteman1dir (siteman1dir.U):
3207 This variable is really the same as siteman1direxp, unless you are using
10305dfa
JH
3208 AFS in which case it points to the read/write location whereas
3209 man1direxp only points to the read-only access location. For extra
3210 portability, you should only use this variable within your makefiles.
3211
e755722e
JH
3212installsiteman3dir (siteman3dir.U):
3213 This variable is really the same as siteman3direxp, unless you are using
10305dfa
JH
3214 AFS in which case it points to the read/write location whereas
3215 man3direxp only points to the read-only access location. For extra
3216 portability, you should only use this variable within your makefiles.
3217
3218installsitescript (sitescript.U):
3219 This variable is usually the same as sitescriptexp, unless you are on
3220 a system running AFS, in which case they may differ slightly. You
3221 should always use this variable within your makefiles for portability.
3222
781b178c
JH
3223installstyle (installstyle.U):
3224 This variable describes the "style" of the perl installation.
3225 This is intended to be useful for tools that need to
3226 manipulate entire perl distributions. Perl itself doesn't use
3227 this to find its libraries -- the library directories are
3228 stored directly in Config.pm. Currently, there are only two
3229 styles: "lib" and "lib/perl5". The default library locations
3230 (e.g. privlib, sitelib) are either $prefix/lib or
3231 $prefix/lib/perl5. The former is useful if $prefix is a
3232 directory dedicated to perl (e.g. /opt/perl), while the latter
3233 is useful if $prefix is shared by many packages, e.g. if
3234 $prefix=/usr/local.
9c20e9bc 3235
123f32c0
MB
3236 Unfortunately, while this "style" variable is used to set
3237 defaults for all three directory hierarchies (core, vendor, and
3238 site), there is no guarantee that the same style is actually
3239 appropriate for all those directories. For example, $prefix
3240 might be /opt/perl, but $siteprefix might be /usr/local.
3241 (Perhaps, in retrospect, the "lib" style should never have been
3242 supported, but it did seem like a nice idea at the time.)
3243
3244 The situation is even less clear for tools such as MakeMaker
3245 that can be used to install additional modules into
3246 non-standard places. For example, if a user intends to install
3247 a module into a private directory (perhaps by setting PREFIX on
3248 the Makefile.PL command line), then there is no reason to
3249 assume that the Configure-time $installstyle setting will be
3250 relevant for that PREFIX.
3251
9c20e9bc 3252 This may later be extended to include other information, so
781b178c 3253 be careful with pattern-matching on the results.
9c20e9bc
JH
3254
3255 For compatibility with perl5.005 and earlier, the default
781b178c
JH
3256 setting is based on whether or not $prefix contains the string
3257 "perl".
3258
3259installusrbinperl (instubperl.U):
3260 This variable tells whether Perl should be installed also as
3261 /usr/bin/perl in addition to
3262 $installbin/perl
3263
526fdc24
MS
3264installvendorarch (vendorarch.U):
3265 This variable is really the same as vendorarchexp but may differ on
3266 those systems using AFS. For extra portability, only this variable
3267 should be used in makefiles.
3268
0617aed7
JH
3269installvendorbin (vendorbin.U):
3270 This variable is really the same as vendorbinexp but may differ on
3271 those systems using AFS. For extra portability, only this variable
3272 should be used in makefiles.
3273
e755722e
JH
3274installvendorhtml1dir (vendorhtml1dir.U):
3275 This variable is really the same as vendorhtml1direxp but may differ on
10305dfa
JH
3276 those systems using AFS. For extra portability, only this variable
3277 should be used in makefiles.
3278
e755722e
JH
3279installvendorhtml3dir (vendorhtml3dir.U):
3280 This variable is really the same as vendorhtml3direxp but may differ on
10305dfa
JH
3281 those systems using AFS. For extra portability, only this variable
3282 should be used in makefiles.
3283
a3635516
JH
3284installvendorlib (vendorlib.U):
3285 This variable is really the same as vendorlibexp but may differ on
3286 those systems using AFS. For extra portability, only this variable
3287 should be used in makefiles.
3288
e755722e
JH
3289installvendorman1dir (vendorman1dir.U):
3290 This variable is really the same as vendorman1direxp but may differ on
10305dfa
JH
3291 those systems using AFS. For extra portability, only this variable
3292 should be used in makefiles.
3293
e755722e
JH
3294installvendorman3dir (vendorman3dir.U):
3295 This variable is really the same as vendorman3direxp but may differ on
10305dfa
JH
3296 those systems using AFS. For extra portability, only this variable
3297 should be used in makefiles.
3298
3299installvendorscript (vendorscript.U):
3300 This variable is really the same as vendorscriptexp but may differ on
3301 those systems using AFS. For extra portability, only this variable
3302 should be used in makefiles.
3303
781b178c
JH
3304intsize (intsize.U):
3305 This variable contains the value of the INTSIZE symbol, which
3306 indicates to the C program how many bytes there are in an int.
3307
4b661809 3308issymlink (issymlink.U):
983dbef6
JH
3309 This variable holds the test command to test for a symbolic link
3310 (if they are supported). Typical values include 'test -h' and
3311 'test -L'.
4b661809 3312
a22e52b9
JH
3313ivdformat (perlxvf.U):
3314 This variable contains the format string used for printing
3315 a Perl IV as a signed decimal integer.
3316
3317ivsize (perlxv.U):
3318 This variable is the size of an IV in bytes.
3319
3320ivtype (perlxv.U):
3321 This variable contains the C type used for Perl's IV.
3322
781b178c
JH
3323known_extensions (Extensions.U):
3324 This variable holds a list of all XS extensions included in
3325 the package.
3326
3327ksh (Loc.U):
3328 This variable is defined but not used by Configure.
3329 The value is a plain '' and is not useful.
3330
781b178c
JH
3331ld (dlsrc.U):
3332 This variable indicates the program to be used to link
3333 libraries for dynamic loading. On some systems, it is 'ld'.
3334 On ELF systems, it should be $cc. Mostly, we'll try to respect
3335 the hint file setting.
3336
3337lddlflags (dlsrc.U):
3338 This variable contains any special flags that might need to be
3339 passed to $ld to create a shared library suitable for dynamic
3340 loading. It is up to the makefile to use it. For hpux, it
3341 should be '-b'. For sunos 4.1, it is empty.
3342
3343ldflags (ccflags.U):
3344 This variable contains any additional C loader flags desired by
3345 the user. It is up to the Makefile to use this.
3346
af960fef
JH
3347ldflags_uselargefiles (uselfs.U):
3348 This variable contains the loader flags needed by large file builds
3349 and added to ldflags by hints files.
3350
781b178c
JH
3351ldlibpthname (libperl.U):
3352 This variable holds the name of the shared library
3353 search path, often LD_LIBRARY_PATH. To get an empty
3354 string, the hints file must set this to 'none'.
3355
3356less (Loc.U):
5bf26616 3357 This variable is used internally by Configure to determine the
781b178c
JH
3358 full pathname (if any) of the less program. After Configure runs,
3359 the value is reset to a plain "less" and is not useful.
3360
3361lib_ext (Unix.U):
3362 This is an old synonym for _a.
3363
3364libc (libc.U):
3365 This variable contains the location of the C library.
3366
3367libperl (libperl.U):
3368 The perl executable is obtained by linking perlmain.c with
3369 libperl, any static extensions (usually just DynaLoader),
3370 and any other libraries needed on this system. libperl
3371 is usually libperl.a, but can also be libperl.so.xxx if
3372 the user wishes to build a perl executable with a shared
3373 library.
3374
3375libpth (libpth.U):
3376 This variable holds the general path (space-separated) used to find
3377 libraries. It is intended to be used by other units.
3378
3379libs (libs.U):
3380 This variable holds the additional libraries we want to use.
9285ede2 3381 It is up to the Makefile to deal with it. The list can be empty.
781b178c 3382
fe749a9f
JH
3383libsdirs (libs.U):
3384 This variable holds the directory names aka dirnames of the libraries
3385 we found and accepted, duplicates are removed.
3386
3387libsfiles (libs.U):
3388 This variable holds the filenames aka basenames of the libraries
3389 we found and accepted.
3390
3391libsfound (libs.U):
3392 This variable holds the full pathnames of the libraries
3393 we found and accepted.
3394
13b3f787
JH
3395libspath (libs.U):
3396 This variable holds the directory names probed for libraries.
3397
781b178c
JH
3398libswanted (Myinit.U):
3399 This variable holds a list of all the libraries we want to
3400 search. The order is chosen to pick up the c library
3401 ahead of ucb or bsd libraries for SVR4.
3402
af960fef
JH
3403libswanted_uselargefiles (uselfs.U):
3404 This variable contains the libraries needed by large file builds
3405 and added to ldflags by hints files. It is a space separated list
3406 of the library names without the "lib" prefix or any suffix, just
209e5c0a 3407 like libswanted..
af960fef 3408
781b178c 3409line (Loc.U):
ff935051
JH
3410 This variable is defined but not used by Configure.
3411 The value is a plain '' and is not useful.
781b178c
JH
3412
3413lint (Loc.U):
3414 This variable is defined but not used by Configure.
3415 The value is a plain '' and is not useful.
3416
3417lkflags (ccflags.U):
3418 This variable contains any additional C partial linker flags desired by
3419 the user. It is up to the Makefile to use this.
3420
3421ln (Loc.U):
5bf26616 3422 This variable is used internally by Configure to determine the
781b178c
JH
3423 full pathname (if any) of the ln program. After Configure runs,
3424 the value is reset to a plain "ln" and is not useful.
3425
3426lns (lns.U):
3427 This variable holds the name of the command to make
3428 symbolic links (if they are supported). It can be used
3429 in the Makefile. It is either 'ln -s' or 'ln'
3430
10bc17b6
JH
3431localtime_r_proto (d_localtime_r.U):
3432 This variable encodes the prototype of localtime_r.
39183afa
JH
3433 It is zero if d_localtime_r is undef, and one of the
3434 REENTRANT_PROTO_T_ABC macros of reentr.h if d_localtime_r
3435 is defined.
10bc17b6 3436
781b178c
JH
3437locincpth (ccflags.U):
3438 This variable contains a list of additional directories to be
3439 searched by the compiler. The appropriate '-I' directives will
3440 be added to ccflags. This is intended to simplify setting
3441 local directories from the Configure command line.
3442 It's not much, but it parallels the loclibpth stuff in libpth.U.
3443
3444loclibpth (libpth.U):
3445 This variable holds the paths (space-separated) used to find local
3446 libraries. It is prepended to libpth, and is intended to be easily
3447 set from the command line.
3448
3449longdblsize (d_longdbl.U):
3450 This variable contains the value of the LONG_DOUBLESIZE symbol, which
3451 indicates to the C program how many bytes there are in a long double,
3452 if this system supports long doubles.
3453
3454longlongsize (d_longlong.U):
3455 This variable contains the value of the LONGLONGSIZE symbol, which
3456 indicates to the C program how many bytes there are in a long long,
3457 if this system supports long long.
3458
3459longsize (intsize.U):
3460 This variable contains the value of the LONGSIZE symbol, which
3461 indicates to the C program how many bytes there are in a long.
3462
3463lp (Loc.U):
3464 This variable is defined but not used by Configure.
3465 The value is a plain '' and is not useful.
3466
3467lpr (Loc.U):
3468 This variable is defined but not used by Configure.
3469 The value is a plain '' and is not useful.
3470
3471ls (Loc.U):
5bf26616 3472 This variable is used internally by Configure to determine the
781b178c
JH
3473 full pathname (if any) of the ls program. After Configure runs,
3474 the value is reset to a plain "ls" and is not useful.
3475
3476lseeksize (lseektype.U):
3477 This variable defines lseektype to be something like off_t, long,
3478 or whatever type is used to declare lseek offset's type in the
3479 kernel (which also appears to be lseek's return type).
3480
3481lseektype (lseektype.U):
3482 This variable defines lseektype to be something like off_t, long,
3483 or whatever type is used to declare lseek offset's type in the
3484 kernel (which also appears to be lseek's return type).
3485
3486mail (Loc.U):
3487 This variable is defined but not used by Configure.
3488 The value is a plain '' and is not useful.
3489
3490mailx (Loc.U):
3491 This variable is defined but not used by Configure.
3492 The value is a plain '' and is not useful.
3493
3494make (Loc.U):
5bf26616 3495 This variable is used internally by Configure to determine the
c532c9d1
JH
3496 full pathname (if any) of the make program. After Configure runs,
3497 the value is reset to a plain "make" and is not useful.
3498
781b178c
JH
3499make_set_make (make.U):
3500 Some versions of 'make' set the variable MAKE. Others do not.
3501 This variable contains the string to be included in Makefile.SH
3502 so that MAKE is set if needed, and not if not needed.
3503 Possible values are:
44b94491 3504
781b178c 3505 make_set_make='#' # If your make program handles this for you,
44b94491 3506
781b178c 3507 make_set_make="MAKE=$make" # if it doesn't.
44b94491
MB
3508
3509 This uses a comment character to distinguish a
781b178c
JH
3510 'set' value (from a previous config.sh or Configure '-D' option)
3511 from an uncomputed value.
3512
3513mallocobj (mallocsrc.U):
3514 This variable contains the name of the malloc.o that this package
3515 generates, if that malloc.o is preferred over the system malloc.
3516 Otherwise the value is null. This variable is intended for generating
3517 Makefiles. See mallocsrc.
3518
3519mallocsrc (mallocsrc.U):
3520 This variable contains the name of the malloc.c that comes with
3521 the package, if that malloc.c is preferred over the system malloc.
3522 Otherwise the value is null. This variable is intended for generating
3523 Makefiles.
3524
3525malloctype (mallocsrc.U):
3526 This variable contains the kind of ptr returned by malloc and realloc.
3527
3528man1dir (man1dir.U):
3529 This variable contains the name of the directory in which manual
3530 source pages are to be put. It is the responsibility of the
3531 Makefile.SH to get the value of this into the proper command.
3532 You must be prepared to do the ~name expansion yourself.
3533
3534man1direxp (man1dir.U):
3535 This variable is the same as the man1dir variable, but is filename
3536 expanded at configuration time, for convenient use in makefiles.
3537
3538man1ext (man1dir.U):
3539 This variable contains the extension that the manual page should
3540 have: one of 'n', 'l', or '1'. The Makefile must supply the '.'.
3541 See man1dir.
3542
3543man3dir (man3dir.U):
3544 This variable contains the name of the directory in which manual
3545 source pages are to be put. It is the responsibility of the
3546 Makefile.SH to get the value of this into the proper command.
3547 You must be prepared to do the ~name expansion yourself.
3548
3549man3direxp (man3dir.U):
3550 This variable is the same as the man3dir variable, but is filename
3551 expanded at configuration time, for convenient use in makefiles.
3552
3553man3ext (man3dir.U):
3554 This variable contains the extension that the manual page should
3555 have: one of 'n', 'l', or '3'. The Makefile must supply the '.'.
3556 See man3dir.
3557
4d54317a
JH
3558Mcc (Loc.U):
3559 This variable is used internally by Configure to determine the
3560 full pathname (if any) of the Mcc program. After Configure runs,
3561 the value is reset to a plain "Mcc" and is not useful.
3562
781b178c
JH
3563mips_type (usrinc.U):
3564 This variable holds the environment type for the mips system.
3565 Possible values are "BSD 4.3" and "System V".
3566
65d1576c 3567mistrustnm (Csym.U):
5129fff4
JH
3568 This variable can be used to establish a fallthrough for the cases
3569 where nm fails to find a symbol. If usenm is false or usenm is true
3570 and mistrustnm is false, this variable has no effect. If usenm is true
3571 and mistrustnm is "compile", a test program will be compiled to try to
3572 find any symbol that can't be located via nm lookup. If mistrustnm is
3573 "run", the test program will be run as well as being compiled.
3574
781b178c 3575mkdir (Loc.U):
5bf26616 3576 This variable is used internally by Configure to determine the
781b178c
JH
3577 full pathname (if any) of the mkdir program. After Configure runs,
3578 the value is reset to a plain "mkdir" and is not useful.
3579
fe749a9f
JH
3580mmaptype (d_mmap.U):
3581 This symbol contains the type of pointer returned by mmap()
3582 (and simultaneously the type of the first argument).
3583 It can be 'void *' or 'caddr_t'.
3584
781b178c
JH
3585modetype (modetype.U):
3586 This variable defines modetype to be something like mode_t,
3587 int, unsigned short, or whatever type is used to declare file
3588 modes for system calls.
3589
3590more (Loc.U):
5bf26616 3591 This variable is used internally by Configure to determine the
781b178c
JH
3592 full pathname (if any) of the more program. After Configure runs,
3593 the value is reset to a plain "more" and is not useful.
3594
3595multiarch (multiarch.U):
3596 This variable conditionally defines the MULTIARCH symbol
3597 which signifies the presence of multiplatform files.
3598 This is normally set by hints files.
3599
3600mv (Loc.U):
3601 This variable is defined but not used by Configure.
3602 The value is a plain '' and is not useful.
3603
3604myarchname (archname.U):
3605 This variable holds the architecture name computed by Configure in
3606 a previous run. It is not intended to be perused by any user and
3607 should never be set in a hint file.
3608
3609mydomain (myhostname.U):
3610 This variable contains the eventual value of the MYDOMAIN symbol,
3611 which is the domain of the host the program is going to run on.
3612 The domain must be appended to myhostname to form a complete host name.
3613 The dot comes with mydomain, and need not be supplied by the program.
3614
3615myhostname (myhostname.U):
3616 This variable contains the eventual value of the MYHOSTNAME symbol,
3617 which is the name of the host the program is going to run on.
3618 The domain is not kept with hostname, but must be gotten from mydomain.
3619 The dot comes with mydomain, and need not be supplied by the program.
3620
3621myuname (Oldconfig.U):
3622 The output of 'uname -a' if available, otherwise the hostname. On Xenix,
3623 pseudo variables assignments in the output are stripped, thank you. The
3624 whole thing is then lower-cased.
3625
3626n (n.U):
3627 This variable contains the '-n' flag if that is what causes the echo
3628 command to suppress newline. Otherwise it is null. Correct usage is
3629 $echo $n "prompt for a question: $c".
3630
2cc61e15
DD
3631need_va_copy (need_va_copy.U):
3632 This symbol, if defined, indicates that the system stores
3633 the variable argument list datatype, va_list, in a format
3634 that cannot be copied by simple assignment, so that some
3635 other means must be used when copying is required.
3636 As such systems vary in their provision (or non-provision)
3637 of copying mechanisms, handy.h defines a platform-
3638 independent macro, Perl_va_copy(src, dst), to do the job.
3639
781b178c
JH
3640netdb_hlen_type (netdbtype.U):
3641 This variable holds the type used for the 2nd argument to
3642 gethostbyaddr(). Usually, this is int or size_t or unsigned.
3643 This is only useful if you have gethostbyaddr(), naturally.
3644
3645netdb_host_type (netdbtype.U):
3646 This variable holds the type used for the 1st argument to
3647 gethostbyaddr(). Usually, this is char * or void *, possibly
3648 with or without a const prefix.
3649 This is only useful if you have gethostbyaddr(), naturally.
3650
3651netdb_name_type (netdbtype.U):
3652 This variable holds the type used for the argument to
3653 gethostbyname(). Usually, this is char * or const char *.
3654 This is only useful if you have gethostbyname(), naturally.
3655
3656netdb_net_type (netdbtype.U):
3657 This variable holds the type used for the 1st argument to
3658 getnetbyaddr(). Usually, this is int or long.
3659 This is only useful if you have getnetbyaddr(), naturally.
3660
3661nm (Loc.U):
5bf26616 3662 This variable is used internally by Configure to determine the
781b178c
JH
3663 full pathname (if any) of the nm program. After Configure runs,
3664 the value is reset to a plain "nm" and is not useful.
3665
3666nm_opt (usenm.U):
3667 This variable holds the options that may be necessary for nm.
3668
3669nm_so_opt (usenm.U):
3670 This variable holds the options that may be necessary for nm
3671 to work on a shared library but that can not be used on an
3672 archive library. Currently, this is only used by Linux, where
3673 nm --dynamic is *required* to get symbols from an ELF library which
3674 has been stripped, but nm --dynamic is *fatal* on an archive library.
3675 Maybe Linux should just always set usenm=false.
3676
3677nonxs_ext (Extensions.U):
3678 This variable holds a list of all non-xs extensions included
3679 in the package. All of them will be built.
3680
3681nroff (Loc.U):
5bf26616 3682 This variable is used internally by Configure to determine the
781b178c
JH
3683 full pathname (if any) of the nroff program. After Configure runs,
3684 the value is reset to a plain "nroff" and is not useful.
3685
2f12987e
JH
3686nv_preserves_uv_bits (perlxv.U):
3687 This variable indicates how many of bits type uvtype
3688 a variable nvtype can preserve.
3689
6b4667fc
A
3690nveformat (perlxvf.U):
3691 This variable contains the format string used for printing
3692 a Perl NV using %e-ish floating point format.
3693
4d54317a
JH
3694nvEUformat (perlxvf.U):
3695 This variable contains the format string used for printing
3696 a Perl NV using %E-ish floating point format.
3697
6b4667fc
A
3698nvfformat (perlxvf.U):
3699 This variable confains the format string used for printing
3700 a Perl NV using %f-ish floating point format.
3701
4d54317a
JH
3702nvFUformat (perlxvf.U):
3703 This variable confains the format string used for printing
3704 a Perl NV using %F-ish floating point format.
3705
6b4667fc
A
3706nvgformat (perlxvf.U):
3707 This variable contains the format string used for printing
3708 a Perl NV using %g-ish floating point format.
3709
4d54317a
JH
3710nvGUformat (perlxvf.U):
3711 This variable contains the format string used for printing
3712 a Perl NV using %G-ish floating point format.
3713
a22e52b9
JH
3714nvsize (perlxv.U):
3715 This variable is the size of an NV in bytes.
3716
3717nvtype (perlxv.U):
3718 This variable contains the C type used for Perl's NV.
3719
781b178c
JH
3720o_nonblock (nblock_io.U):
3721 This variable bears the symbol value to be used during open() or fcntl()
3722 to turn on non-blocking I/O for a file descriptor. If you wish to switch
3723 between blocking and non-blocking, you may try ioctl(FIOSNBIO) instead,
3724 but that is only supported by some devices.
3725
3726obj_ext (Unix.U):
3727 This is an old synonym for _o.
3728
3729old_pthread_create_joinable (d_pthrattrj.U):
3730 This variable defines the constant to use for creating joinable
3731 (aka undetached) pthreads. Unused if pthread.h defines
3732 PTHREAD_CREATE_JOINABLE. If used, possible values are
3733 PTHREAD_CREATE_UNDETACHED and __UNDETACHED.
3734
3735optimize (ccflags.U):
3736 This variable contains any optimizer/debugger flag that should be used.
3737 It is up to the Makefile to use it.
3738
3739orderlib (orderlib.U):
3740 This variable is "true" if the components of libraries must be ordered
3741 (with `lorder $* | tsort`) before placing them in an archive. Set to
3742 "false" if ranlib or ar can generate random libraries.
3743
3744osname (Oldconfig.U):
3745 This variable contains the operating system name (e.g. sunos,
3746 solaris, hpux, etc.). It can be useful later on for setting
3747 defaults. Any spaces are replaced with underscores. It is set
3748 to a null string if we can't figure it out.
3749
3750osvers (Oldconfig.U):
3751 This variable contains the operating system version (e.g.
3752 4.1.3, 5.2, etc.). It is primarily used for helping select
3753 an appropriate hints file, but might be useful elsewhere for
3754 setting defaults. It is set to '' if we can't figure it out.
3755 We try to be flexible about how much of the version number
3756 to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the
3757 same for this package, hints files might just be os_4.0 or
3758 os_4.1, etc., not keeping separate files for each little release.
3759
3b777bb4
GS
3760otherlibdirs (otherlibdirs.U):
3761 This variable contains a colon-separated set of paths for the perl
3762 binary to search for additional library files or modules.
3763 These directories will be tacked to the end of @INC.
3764 Perl will automatically search below each path for version-
3765 and architecture-specific directories. See inc_version_list
3766 for more details.
3767 A value of ' ' means 'none' and is used to preserve this value
3768 for the next run through Configure.
3769
781b178c
JH
3770package (package.U):
3771 This variable contains the name of the package being constructed.
3772 It is primarily intended for the use of later Configure units.
3773
3774pager (pager.U):
3775 This variable contains the name of the preferred pager on the system.
3776 Usual values are (the full pathnames of) more, less, pg, or cat.
3777
3778passcat (nis.U):
3779 This variable contains a command that produces the text of the
3780 /etc/passwd file. This is normally "cat /etc/passwd", but can be
3781 "ypcat passwd" when NIS is used.
aaacdc8b
GS
3782 On some systems, such as os390, there may be no equivalent
3783 command, in which case this variable is unset.
781b178c
JH
3784
3785patchlevel (patchlevel.U):
3786 The patchlevel level of this package.
3787 The value of patchlevel comes from the patchlevel.h file.
ff935051 3788 In a version number such as 5.6.1, this is the "6".
c890dc6c 3789 In patchlevel.h, this is referred to as "PERL_VERSION".
781b178c
JH
3790
3791path_sep (Unix.U):
3792 This is an old synonym for p_ in Head.U, the character
3793 used to separate elements in the command shell search PATH.
3794
c890dc6c
JH
3795perl5 (perl5.U):
3796 This variable contains the full path (if any) to a previously
3797 installed perl5.005 or later suitable for running the script
3798 to determine inc_version_list.
3799
781b178c 3800perl (Loc.U):
c890dc6c
JH
3801 This variable is defined but not used by Configure.
3802 The value is a plain '' and is not useful.
781b178c 3803
a6d26a0d
JH
3804perl_patchlevel (patchlevel.U):
3805 This is the Perl patch level, a numeric change identifier,
3806 as defined by whichever source code maintenance system
3807 is used to maintain the patches; currently Perforce.
3808 It does not correlate with the Perl version numbers or
3809 the maintenance versus development dichotomy except
3810 by also being increasing.
3811
4d54317a
JH
3812PERL_REVISION (Oldsyms.U):
3813 In a Perl version number such as 5.6.2, this is the 5.
3814 This value is manually set in patchlevel.h
3815
3816PERL_SUBVERSION (Oldsyms.U):
3817 In a Perl version number such as 5.6.2, this is the 2.
3818 Values greater than 50 represent potentially unstable
3819 development subversions.
3820 This value is manually set in patchlevel.h
3821
3822PERL_VERSION (Oldsyms.U):
3823 In a Perl version number such as 5.6.2, this is the 6.
3824 This value is manually set in patchlevel.h
3825
781b178c
JH
3826perladmin (perladmin.U):
3827 Electronic mail address of the perl5 administrator.
3828
b7a73309
JH
3829perllibs (End.U):
3830 The list of libraries needed by Perl only (any libraries needed
3831 by extensions only will by dropped, if using dynamic loading).
3832
781b178c
JH
3833perlpath (perlpath.U):
3834 This variable contains the eventual value of the PERLPATH symbol,
3835 which contains the name of the perl interpreter to be used in
a10d74f3
PG
3836 shell scripts and in the "eval 'exec'" idiom. This variable is
3837 not necessarily the pathname of the file containing the perl
3838 interpreter; you must append the executable extension (_exe) if
3839 it is not already present. Note that Perl code that runs during
3840 the Perl build process cannot reference this variable, as Perl
3841 may not have been installed, or even if installed, may be a
3842 different version of Perl.
781b178c
JH
3843
3844pg (Loc.U):
5bf26616 3845 This variable is used internally by Configure to determine the
781b178c
JH
3846 full pathname (if any) of the pg program. After Configure runs,
3847 the value is reset to a plain "pg" and is not useful.
3848
3849phostname (myhostname.U):
3850 This variable contains the eventual value of the PHOSTNAME symbol,
3851 which is a command that can be fed to popen() to get the host name.
3852 The program should probably not presume that the domain is or isn't
3853 there already.
3854
3855pidtype (pidtype.U):
3856 This variable defines PIDTYPE to be something like pid_t, int,
3857 ushort, or whatever type is used to declare process ids in the kernel.
3858
3859plibpth (libpth.U):
3860 Holds the private path used by Configure to find out the libraries.
3861 Its value is prepend to libpth. This variable takes care of special
3862 machines, like the mips. Usually, it should be empty.
3863
3864pmake (Loc.U):
3865 This variable is defined but not used by Configure.
3866 The value is a plain '' and is not useful.
3867
3868pr (Loc.U):
3869 This variable is defined but not used by Configure.
3870 The value is a plain '' and is not useful.
3871
3872prefix (prefix.U):
3873 This variable holds the name of the directory below which the
3874 user will install the package. Usually, this is /usr/local, and
3875 executables go in /usr/local/bin, library stuff in /usr/local/lib,
3876 man pages in /usr/local/man, etc. It is only used to set defaults
3877 for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.
3878
3879prefixexp (prefix.U):
3880 This variable holds the full absolute path of the directory below
3881 which the user will install the package. Derived from prefix.
3882
3883privlib (privlib.U):
3884 This variable contains the eventual value of the PRIVLIB symbol,
3885 which is the name of the private library for this package. It may
3886 have a ~ on the front. It is up to the makefile to eventually create
3887 this directory while performing installation (with ~ substitution).
3888
3889privlibexp (privlib.U):
3890 This variable is the ~name expanded version of privlib, so that you
3891 may use it directly in Makefiles or shell scripts.
3892
428dc699
JH
3893procselfexe (d_procselfexe.U):
3894 If d_procselfexe is defined, $procselfexe is the filename
3895 of the symbolic link pointing to the absolute pathname of
3896 the executing program.
3897
781b178c
JH
3898prototype (prototype.U):
3899 This variable holds the eventual value of CAN_PROTOTYPE, which
3900 indicates the C compiler can handle funciton prototypes.
3901
3902ptrsize (ptrsize.U):
3903 This variable contains the value of the PTRSIZE symbol, which
3904 indicates to the C program how many bytes there are in a pointer.
3905
e0a10278 3906quadkind (quadtype.U):
0befd8de
JH
3907 This variable, if defined, encodes the type of a quad:
3908 1 = int, 2 = long, 3 = long long, 4 = int64_t.
3909
3910quadtype (quadtype.U):
3911 This variable defines Quad_t to be something like long, int,
3912 long long, int64_t, or whatever type is used for 64-bit integers.
3913
781b178c
JH
3914randbits (randfunc.U):
3915 Indicates how many bits are produced by the function used to
3916 generate normalized random numbers.
3917
3918randfunc (randfunc.U):
3919 Indicates the name of the random number function to use.
3920 Values include drand48, random, and rand. In C programs,
3921 the 'Drand01' macro is defined to generate uniformly distributed
3922 random numbers over the range [0., 1.[ (see drand01 and nrand).
3923
10bc17b6
JH
3924random_r_proto (d_random_r.U):
3925 This variable encodes the prototype of random_r.
39183afa
JH
3926 It is zero if d_random_r is undef, and one of the
3927 REENTRANT_PROTO_T_ABC macros of reentr.h if d_random_r
3928 is defined.
10bc17b6 3929
781b178c
JH
3930randseedtype (randfunc.U):
3931 Indicates the type of the argument of the seedfunc.
3932
3933ranlib (orderlib.U):
3934 This variable is set to the pathname of the ranlib program, if it is
3935 needed to generate random libraries. Set to ":" if ar can generate
3936 random libraries or if random libraries are not supported
3937
3938rd_nodata (nblock_io.U):
3939 This variable holds the return code from read() when no data is
3940 present. It should be -1, but some systems return 0 when O_NDELAY is
3941 used, which is a shame because you cannot make the difference between
209e5c0a 3942 no data and an EOF.. Sigh!
781b178c 3943
10bc17b6
JH
3944readdir64_r_proto (d_readdir64_r.U):
3945 This variable encodes the prototype of readdir64_r.
39183afa
JH
3946 It is zero if d_readdir64_r is undef, and one of the
3947 REENTRANT_PROTO_T_ABC macros of reentr.h if d_readdir64_r
3948 is defined.
10bc17b6
JH
3949
3950readdir_r_proto (d_readdir_r.U):
3951 This variable encodes the prototype of readdir_r.
39183afa
JH
3952 It is zero if d_readdir_r is undef, and one of the
3953 REENTRANT_PROTO_T_ABC macros of reentr.h if d_readdir_r
3954 is defined.
10bc17b6 3955
c890dc6c
JH
3956revision (patchlevel.U):
3957 The value of revision comes from the patchlevel.h file.
3958 In a version number such as 5.6.1, this is the "5".
3959 In patchlevel.h, this is referred to as "PERL_REVISION".
3960
781b178c 3961rm (Loc.U):
5bf26616 3962 This variable is used internally by Configure to determine the
781b178c
JH
3963 full pathname (if any) of the rm program. After Configure runs,
3964 the value is reset to a plain "rm" and is not useful.
3965
3966rmail (Loc.U):
3967 This variable is defined but not used by Configure.
3968 The value is a plain '' and is not useful.
3969
5440bc8e
JH
3970run (Cross.U):
3971 This variable contains the command used by Configure
3972 to copy and execute a cross-compiled executable in the
3973 target host. Useful and available only during Perl build.
3974 Empty string '' if not cross-compiling.
3975
781b178c
JH
3976runnm (usenm.U):
3977 This variable contains 'true' or 'false' depending whether the
3978 nm extraction should be performed or not, according to the value
3979 of usenm and the flags on the Configure command line.
3980
3981sched_yield (d_pthread_y.U):
3982 This variable defines the way to yield the execution
3983 of the current thread.
3984
3985scriptdir (scriptdir.U):
3986 This variable holds the name of the directory in which the user wants
3987 to put publicly scripts for the package in question. It is either
3988 the same directory as for