This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
make parts of struct regmatch_state unions
[perl5.git] / Porting / Glossary
CommitLineData
1f822b28
JH
1
2!!!!!!! DO NOT EDIT THIS FILE !!!!!!!
3This file is built by metaconfig.
4
d7418ba7
PP
5This file contains a description of all the shell variables whose value is
6determined by the Configure script. Variables intended for use in C
ebc74a4b
GS
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.]
d7418ba7 10
781b178c 11_a (Unix.U):
9285ede2 12 This variable defines the extension used for ordinary library files.
781b178c
JH
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.
24412007
JH
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.
781b178c
JH
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
a6d26a0d
JH
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
635aebb7 37 tests for AFSness in the Perl configure and test process.
a6d26a0d 38
781b178c
JH
39alignbytes (alignbytes.U):
40 This variable holds the number of bytes required to align a
87b71857
JH
41 double-- or a long double when applicable. Usual values are
42 2, 4 and 8. The default is eight, for safety.
781b178c
JH
43
44ansi2knr (ansi2knr.U):
635aebb7 45 This variable is set if the user needs to run ansi2knr.
781b178c
JH
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
ff935051
JH
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.
9c20e9bc
JH
60
61 perl.c:incpush() and lib/lib.pm will automatically search in
ff935051
JH
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.
9c20e9bc
JH
69
70 XXX To do: Since compatibility can depend on compile time
08e5223a 71 options (such as bincompat, longlong, etc.) it should
ff935051
JH
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.
781b178c
JH
98
99ar (Loc.U):
5bf26616 100 This variable is used internally by Configure to determine the
781b178c
JH
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
10bc17b6
JH
129asctime_r_proto (d_asctime_r.U):
130 This variable encodes the prototype of asctime_r.
39183afa
JH
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.
10bc17b6 134
781b178c 135awk (Loc.U):
5bf26616 136 This variable is used internally by Configure to determine the
781b178c
JH
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):
2d967e39
JH
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.
781b178c
JH
161
162byacc (Loc.U):
5bf26616 163 This variable is used internally by Configure to determine the
781b178c
JH
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):
24412007
JH
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 !
781b178c
JH
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
781b178c
JH
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
5869b1f1
JH
194 name. Usual values are 'cc' and 'gcc'.
195 Fervent ANSI compilers may be called 'c89'. AIX has xlc.
781b178c
JH
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
af960fef
JH
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
6b356c8e
JH
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
781b178c
JH
224ccsymbols (Cppsym.U):
225 The variable contains the symbols defined by the C compiler alone.
52c7d5b6
JH
226 The symbols defined by cpp or by cc when it calls cpp are not in
227 this list, see cppsymbols and cppccsymbols.
781b178c
JH
228 The list is a space-separated list of symbol=value tokens.
229
6b356c8e
JH
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
781b178c
JH
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
a22e52b9
JH
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
781b178c
JH
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):
2765b840
JH
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.
781b178c
JH
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
781b178c
JH
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
781b178c
JH
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
781b178c
JH
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
781b178c
JH
300 used by the C preprocessor.
301
302cppccsymbols (Cppsym.U):
52c7d5b6
JH
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.
781b178c
JH
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):
52c7d5b6
JH
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.
781b178c
JH
340 The list is a space-separated list of symbol=value tokens.
341
10bc17b6
JH
342crypt_r_proto (d_crypt_r.U):
343 This variable encodes the prototype of crypt_r.
39183afa
JH
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
781b178c
JH
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
781b178c
JH
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
10bc17b6
JH
358ctermid_r_proto (d_ctermid_r.U):
359 This variable encodes the prototype of ctermid_r.
39183afa
JH
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.
10bc17b6
JH
363
364ctime_r_proto (d_ctime_r.U):
365 This variable encodes the prototype of ctime_r.
39183afa
JH
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
74cac757
JH
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
781b178c
JH
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
5c567d7d
JH
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
781b178c
JH
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
10bc17b6
JH
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
11dc3f68
JH
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
0dbb1585
AL
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().
781b178c
JH
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
635aebb7
AL
467d_builtin_choose_expr (d_builtin.U):
468 This conditionally defines HAS_BUILTIN_CHOOSE_EXPR, which
469 indicates that the compiler supports __builtin_choose_expr(x,y,z).
470 This built-in function is analogous to the "x?y:z" operator in C,
471 except that the expression returned has its type unaltered by
472 promotion rules. Also, the built-in function does not evaluate
473 the expression that was not chosen.
474
475d_builtin_expect (d_builtin.U):
476 This conditionally defines HAS_BUILTIN_EXPECT, which indicates
477 that the compiler supports __builtin_expect(exp,c). You may use
478 __builtin_expect to provide the compiler with branch prediction
479 information.
480
781b178c
JH
481d_bzero (d_bzero.U):
482 This variable conditionally defines the HAS_BZERO symbol if
483 the bzero() routine is available to set memory to 0.
484
485d_casti32 (d_casti32.U):
486 This variable conditionally defines CASTI32, which indicates
487 whether the C compiler can cast large floats to 32-bit ints.
488
489d_castneg (d_castneg.U):
490 This variable conditionally defines CASTNEG, which indicates
491 wether the C compiler can cast negative float to unsigned.
492
493d_charvspr (d_vprintf.U):
494 This variable conditionally defines CHARVSPRINTF if this system
495 has vsprintf returning type (char*). The trend seems to be to
496 declare it as "int vsprintf()".
497
498d_chown (d_chown.U):
499 This variable conditionally defines the HAS_CHOWN symbol, which
500 indicates to the C program that the chown() routine is available.
501
502d_chroot (d_chroot.U):
503 This variable conditionally defines the HAS_CHROOT symbol, which
504 indicates to the C program that the chroot() routine is available.
505
506d_chsize (d_chsize.U):
507 This variable conditionally defines the CHSIZE symbol, which
508 indicates to the C program that the chsize() routine is available
509 to truncate files. You might need a -lx to get this routine.
510
758a5d79
JH
511d_class (d_class.U):
512 This variable conditionally defines the HAS_CLASS symbol, which
513 indicates to the C program that the class() routine is available.
514
b0a2e8e6
MB
515d_clearenv (d_clearenv.U):
516 This variable conditionally defines the HAS_CLEARENV symbol, which
517 indicates to the C program that the clearenv () routine is available.
518
781b178c
JH
519d_closedir (d_closedir.U):
520 This variable conditionally defines HAS_CLOSEDIR if closedir() is
521 available.
522
4e0554ec
JH
523d_cmsghdr_s (d_cmsghdr_s.U):
524 This variable conditionally defines the HAS_STRUCT_CMSGHDR symbol,
525 which indicates that the struct cmsghdr is supported.
526
781b178c
JH
527d_const (d_const.U):
528 This variable conditionally defines the HASCONST symbol, which
529 indicates to the C program that this C compiler knows about the
530 const type.
531
5c567d7d
JH
532d_copysignl (d_copysignl.U):
533 This variable conditionally defines the HAS_COPYSIGNL symbol, which
534 indicates to the C program that the copysignl() routine is available.
535 If aintl is also present we can emulate modfl.
536
781b178c
JH
537d_crypt (d_crypt.U):
538 This variable conditionally defines the CRYPT symbol, which
539 indicates to the C program that the crypt() routine is available
540 to encrypt passwords and the like.
541
10bc17b6
JH
542d_crypt_r (d_crypt_r.U):
543 This variable conditionally defines the HAS_CRYPT_R symbol,
544 which indicates to the C program that the crypt_r()
545 routine is available.
546
781b178c
JH
547d_csh (d_csh.U):
548 This variable conditionally defines the CSH symbol, which
549 indicates to the C program that the C-shell exists.
550
10bc17b6
JH
551d_ctermid_r (d_ctermid_r.U):
552 This variable conditionally defines the HAS_CTERMID_R symbol,
553 which indicates to the C program that the ctermid_r()
554 routine is available.
555
556d_ctime_r (d_ctime_r.U):
557 This variable conditionally defines the HAS_CTIME_R symbol,
558 which indicates to the C program that the ctime_r()
559 routine is available.
560
781b178c
JH
561d_cuserid (d_cuserid.U):
562 This variable conditionally defines the HAS_CUSERID symbol, which
563 indicates to the C program that the cuserid() routine is available
564 to get character login names.
565
566d_dbl_dig (d_dbl_dig.U):
567 This variable conditionally defines d_dbl_dig if this system's
568 header files provide DBL_DIG, which is the number of significant
569 digits in a double precision number.
570
5af95cda
JH
571d_dbminitproto (d_dbminitproto.U):
572 This variable conditionally defines the HAS_DBMINIT_PROTO symbol,
573 which indicates to the C program that the system provides
574 a prototype for the dbminit() function. Otherwise, it is
575 up to the program to supply one.
576
781b178c
JH
577d_difftime (d_difftime.U):
578 This variable conditionally defines the HAS_DIFFTIME symbol, which
579 indicates to the C program that the difftime() routine is available.
580
428dc699
JH
581d_dirfd (d_dirfd.U):
582 This variable conditionally defines the HAS_DIRFD constant,
583 which indicates to the C program that dirfd() is available
584 to return the file descriptor of a directory stream.
585
781b178c
JH
586d_dirnamlen (i_dirent.U):
587 This variable conditionally defines DIRNAMLEN, which indicates
588 to the C program that the length of directory entry names is
589 provided by a d_namelen field.
590
591d_dlerror (d_dlerror.U):
592 This variable conditionally defines the HAS_DLERROR symbol, which
593 indicates to the C program that the dlerror() routine is available.
594
595d_dlopen (d_dlopen.U):
596 This variable conditionally defines the HAS_DLOPEN symbol, which
597 indicates to the C program that the dlopen() routine is available.
598
599d_dlsymun (d_dlsymun.U):
600 This variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which
601 indicates that we need to prepend an underscore to the symbol
602 name before calling dlsym().
603
604d_dosuid (d_dosuid.U):
605 This variable conditionally defines the symbol DOSUID, which
606 tells the C program that it should insert setuid emulation code
607 on hosts which have setuid #! scripts disabled.
608
10bc17b6
JH
609d_drand48_r (d_drand48_r.U):
610 This variable conditionally defines the HAS_DRAND48_R symbol,
611 which indicates to the C program that the drand48_r()
612 routine is available.
613
781b178c
JH
614d_drand48proto (d_drand48proto.U):
615 This variable conditionally defines the HAS_DRAND48_PROTO symbol,
616 which indicates to the C program that the system provides
617 a prototype for the drand48() function. Otherwise, it is
618 up to the program to supply one.
619
620d_dup2 (d_dup2.U):
621 This variable conditionally defines HAS_DUP2 if dup2() is
622 available to duplicate file descriptors.
623
624d_eaccess (d_eaccess.U):
625 This variable conditionally defines the HAS_EACCESS symbol, which
626 indicates to the C program that the eaccess() routine is available.
627
628d_endgrent (d_endgrent.U):
629 This variable conditionally defines the HAS_ENDGRENT symbol, which
630 indicates to the C program that the endgrent() routine is available
631 for sequential access of the group database.
632
10bc17b6
JH
633d_endgrent_r (d_endgrent_r.U):
634 This variable conditionally defines the HAS_ENDGRENT_R symbol,
635 which indicates to the C program that the endgrent_r()
636 routine is available.
637
781b178c
JH
638d_endhent (d_endhent.U):
639 This variable conditionally defines HAS_ENDHOSTENT if endhostent() is
640 available to close whatever was being used for host queries.
641
10bc17b6
JH
642d_endhostent_r (d_endhostent_r.U):
643 This variable conditionally defines the HAS_ENDHOSTENT_R symbol,
644 which indicates to the C program that the endhostent_r()
645 routine is available.
646
781b178c
JH
647d_endnent (d_endnent.U):
648 This variable conditionally defines HAS_ENDNETENT if endnetent() is
649 available to close whatever was being used for network queries.
650
10bc17b6
JH
651d_endnetent_r (d_endnetent_r.U):
652 This variable conditionally defines the HAS_ENDNETENT_R symbol,
653 which indicates to the C program that the endnetent_r()
654 routine is available.
655
781b178c
JH
656d_endpent (d_endpent.U):
657 This variable conditionally defines HAS_ENDPROTOENT if endprotoent() is
658 available to close whatever was being used for protocol queries.
659
10bc17b6
JH
660d_endprotoent_r (d_endprotoent_r.U):
661 This variable conditionally defines the HAS_ENDPROTOENT_R symbol,
662 which indicates to the C program that the endprotoent_r()
663 routine is available.
664
781b178c
JH
665d_endpwent (d_endpwent.U):
666 This variable conditionally defines the HAS_ENDPWENT symbol, which
667 indicates to the C program that the endpwent() routine is available
668 for sequential access of the passwd database.
669
10bc17b6
JH
670d_endpwent_r (d_endpwent_r.U):
671 This variable conditionally defines the HAS_ENDPWENT_R symbol,
672 which indicates to the C program that the endpwent_r()
673 routine is available.
674
781b178c
JH
675d_endsent (d_endsent.U):
676 This variable conditionally defines HAS_ENDSERVENT if endservent() is
677 available to close whatever was being used for service queries.
678
10bc17b6
JH
679d_endservent_r (d_endservent_r.U):
680 This variable conditionally defines the HAS_ENDSERVENT_R symbol,
681 which indicates to the C program that the endservent_r()
682 routine is available.
683
781b178c
JH
684d_eofnblk (nblock_io.U):
685 This variable conditionally defines EOF_NONBLOCK if EOF can be seen
686 when reading from a non-blocking I/O source.
687
688d_eunice (Guess.U):
689 This variable conditionally defines the symbols EUNICE and VAX, which
690 alerts the C program that it must deal with ideosyncracies of VMS.
691
4d54317a
JH
692d_faststdio (d_faststdio.U):
693 This variable conditionally defines the HAS_FAST_STDIO symbol,
694 which indicates to the C program that the "fast stdio" is available
695 to manipulate the stdio buffers directly.
696
b363b713
JH
697d_fchdir (d_fchdir.U):
698 This variable conditionally defines the HAS_FCHDIR symbol, which
699 indicates to the C program that the fchdir() routine is available.
700
781b178c
JH
701d_fchmod (d_fchmod.U):
702 This variable conditionally defines the HAS_FCHMOD symbol, which
703 indicates to the C program that the fchmod() routine is available
704 to change mode of opened files.
705
706d_fchown (d_fchown.U):
707 This variable conditionally defines the HAS_FCHOWN symbol, which
708 indicates to the C program that the fchown() routine is available
709 to change ownership of opened files.
710
711d_fcntl (d_fcntl.U):
712 This variable conditionally defines the HAS_FCNTL symbol, and indicates
713 whether the fcntl() function exists
714
9d9004a9
AD
715d_fcntl_can_lock (d_fcntl_can_lock.U):
716 This variable conditionally defines the FCNTL_CAN_LOCK symbol
717 and indicates whether file locking with fcntl() works.
718
781b178c
JH
719d_fd_macros (d_fd_set.U):
720 This variable contains the eventual value of the HAS_FD_MACROS symbol,
721 which indicates if your C compiler knows about the macros which
722 manipulate an fd_set.
723
724d_fd_set (d_fd_set.U):
725 This variable contains the eventual value of the HAS_FD_SET symbol,
726 which indicates if your C compiler knows about the fd_set typedef.
727
728d_fds_bits (d_fd_set.U):
729 This variable contains the eventual value of the HAS_FDS_BITS symbol,
730 which indicates if your fd_set typedef contains the fds_bits member.
731 If you have an fd_set typedef, but the dweebs who installed it did
732 a half-fast job and neglected to provide the macros to manipulate
733 an fd_set, HAS_FDS_BITS will let us know how to fix the gaffe.
734
781b178c
JH
735d_fgetpos (d_fgetpos.U):
736 This variable conditionally defines HAS_FGETPOS if fgetpos() is
737 available to get the file position indicator.
738
758a5d79
JH
739d_finite (d_finite.U):
740 This variable conditionally defines the HAS_FINITE symbol, which
741 indicates to the C program that the finite() routine is available.
742
743d_finitel (d_finitel.U):
744 This variable conditionally defines the HAS_FINITEL symbol, which
745 indicates to the C program that the finitel() routine is available.
746
781b178c
JH
747d_flexfnam (d_flexfnam.U):
748 This variable conditionally defines the FLEXFILENAMES symbol, which
749 indicates that the system supports filenames longer than 14 characters.
750
781b178c
JH
751d_flock (d_flock.U):
752 This variable conditionally defines HAS_FLOCK if flock() is
753 available to do file locking.
754
5af95cda
JH
755d_flockproto (d_flockproto.U):
756 This variable conditionally defines the HAS_FLOCK_PROTO symbol,
757 which indicates to the C program that the system provides
758 a prototype for the flock() function. Otherwise, it is
759 up to the program to supply one.
760
781b178c
JH
761d_fork (d_fork.U):
762 This variable conditionally defines the HAS_FORK symbol, which
763 indicates to the C program that the fork() routine is available.
764
758a5d79
JH
765d_fp_class (d_fp_class.U):
766 This variable conditionally defines the HAS_FP_CLASS symbol, which
767 indicates to the C program that the fp_class() routine is available.
768
781b178c
JH
769d_fpathconf (d_pathconf.U):
770 This variable conditionally defines the HAS_FPATHCONF symbol, which
771 indicates to the C program that the pathconf() routine is available
772 to determine file-system related limits and options associated
773 with a given open file descriptor.
774
758a5d79
JH
775d_fpclass (d_fpclass.U):
776 This variable conditionally defines the HAS_FPCLASS symbol, which
777 indicates to the C program that the fpclass() routine is available.
778
779d_fpclassify (d_fpclassify.U):
780 This variable conditionally defines the HAS_FPCLASSIFY symbol, which
781 indicates to the C program that the fpclassify() routine is available.
782
783d_fpclassl (d_fpclassl.U):
784 This variable conditionally defines the HAS_FPCLASSL symbol, which
785 indicates to the C program that the fpclassl() routine is available.
786
c890dc6c 787d_fpos64_t (d_fpos64_t.U):
ca24dfc6 788 This symbol will be defined if the C compiler supports fpos64_t.
781b178c 789
a3540c92
JH
790d_frexpl (d_frexpl.U):
791 This variable conditionally defines the HAS_FREXPL symbol, which
792 indicates to the C program that the frexpl() routine is available.
793
ad27e871 794d_fs_data_s (d_fs_data_s.U):
0545a864
JH
795 This variable conditionally defines the HAS_STRUCT_FS_DATA symbol,
796 which indicates that the struct fs_data is supported.
797
781b178c
JH
798d_fseeko (d_fseeko.U):
799 This variable conditionally defines the HAS_FSEEKO symbol, which
800 indicates to the C program that the fseeko() routine is available.
801
781b178c
JH
802d_fsetpos (d_fsetpos.U):
803 This variable conditionally defines HAS_FSETPOS if fsetpos() is
804 available to set the file position indicator.
805
0545a864 806d_fstatfs (d_fstatfs.U):
781b178c
JH
807 This variable conditionally defines the HAS_FSTATFS symbol, which
808 indicates to the C program that the fstatfs() routine is available.
809
810d_fstatvfs (d_statvfs.U):
811 This variable conditionally defines the HAS_FSTATVFS symbol, which
812 indicates to the C program that the fstatvfs() routine is available.
813
411ab01c
JH
814d_fsync (d_fsync.U):
815 This variable conditionally defines the HAS_FSYNC symbol, which
816 indicates to the C program that the fsync() routine is available.
817
781b178c
JH
818d_ftello (d_ftello.U):
819 This variable conditionally defines the HAS_FTELLO symbol, which
820 indicates to the C program that the ftello() routine is available.
821
822d_ftime (d_ftime.U):
823 This variable conditionally defines the HAS_FTIME symbol, which indicates
824 that the ftime() routine exists. The ftime() routine is basically
825 a sub-second accuracy clock.
826
dc814df1
MB
827d_futimes (f_futimes.U):
828 This variable conditionally defines the HAS_FUTIMES symbol, which
829 indicates to the C program that the futimes() routine is available.
830
4d54317a
JH
831d_Gconvert (d_gconvert.U):
832 This variable holds what Gconvert is defined as to convert
833 floating point numbers into strings. By default, Configure
834 sets this macro to use the first of gconvert, gcvt, or sprintf
835 that pass sprintf-%g-like behaviour tests. If perl is using
836 long doubles, the macro uses the first of the following
837 functions that pass Configure's tests: qgcvt, sprintf (if
838 Configure knows how to make sprintf format long doubles--see
635aebb7
AL
839 sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).
840 The gconvert_preference and gconvert_ld_preference variables
4d54317a 841 can be used to alter Configure's preferences, for doubles and
635aebb7
AL
842 long doubles, respectively. If present, they contain a
843 space-separated list of one or more of the above function
4d54317a
JH
844 names in the order they should be tried.
845
846 d_Gconvert may be set to override Configure with a platform-
847 specific function. If this function expects a double, a
848 different value may need to be set by the uselongdouble.cbu
849 call-back unit so that long doubles can be formatted without
850 loss of precision.
851
49dabb45
JH
852d_getcwd (d_getcwd.U):
853 This variable conditionally defines the HAS_GETCWD symbol, which
854 indicates to the C program that the getcwd() routine is available
855 to get the current working directory.
856
3813c136
JH
857d_getespwnam (d_getespwnam.U):
858 This variable conditionally defines HAS_GETESPWNAM if getespwnam() is
859 available to retrieve enchanced (shadow) password entries by name.
860
c890dc6c
JH
861d_getfsstat (d_getfsstat.U):
862 This variable conditionally defines the HAS_GETFSSTAT symbol, which
863 indicates to the C program that the getfsstat() routine is available.
864
781b178c
JH
865d_getgrent (d_getgrent.U):
866 This variable conditionally defines the HAS_GETGRENT symbol, which
867 indicates to the C program that the getgrent() routine is available
868 for sequential access of the group database.
869
10bc17b6
JH
870d_getgrent_r (d_getgrent_r.U):
871 This variable conditionally defines the HAS_GETGRENT_R symbol,
872 which indicates to the C program that the getgrent_r()
873 routine is available.
874
875d_getgrgid_r (d_getgrgid_r.U):
876 This variable conditionally defines the HAS_GETGRGID_R symbol,
877 which indicates to the C program that the getgrgid_r()
878 routine is available.
879
880d_getgrnam_r (d_getgrnam_r.U):
881 This variable conditionally defines the HAS_GETGRNAM_R symbol,
882 which indicates to the C program that the getgrnam_r()
883 routine is available.
884
781b178c
JH
885d_getgrps (d_getgrps.U):
886 This variable conditionally defines the HAS_GETGROUPS symbol, which
887 indicates to the C program that the getgroups() routine is available
888 to get the list of process groups.
889
890d_gethbyaddr (d_gethbyad.U):
891 This variable conditionally defines the HAS_GETHOSTBYADDR symbol, which
892 indicates to the C program that the gethostbyaddr() routine is available
893 to look up hosts by their IP addresses.
894
895d_gethbyname (d_gethbynm.U):
896 This variable conditionally defines the HAS_GETHOSTBYNAME symbol, which
897 indicates to the C program that the gethostbyname() routine is available
898 to look up host names in some data base or other.
899
900d_gethent (d_gethent.U):
901 This variable conditionally defines HAS_GETHOSTENT if gethostent() is
902 available to look up host names in some data base or another.
903
904d_gethname (d_gethname.U):
905 This variable conditionally defines the HAS_GETHOSTNAME symbol, which
906 indicates to the C program that the gethostname() routine may be
907 used to derive the host name.
908
10bc17b6
JH
909d_gethostbyaddr_r (d_gethostbyaddr_r.U):
910 This variable conditionally defines the HAS_GETHOSTBYADDR_R symbol,
911 which indicates to the C program that the gethostbyaddr_r()
912 routine is available.
913
914d_gethostbyname_r (d_gethostbyname_r.U):
915 This variable conditionally defines the HAS_GETHOSTBYNAME_R symbol,
916 which indicates to the C program that the gethostbyname_r()
917 routine is available.
918
919d_gethostent_r (d_gethostent_r.U):
920 This variable conditionally defines the HAS_GETHOSTENT_R symbol,
921 which indicates to the C program that the gethostent_r()
922 routine is available.
923
781b178c
JH
924d_gethostprotos (d_gethostprotos.U):
925 This variable conditionally defines the HAS_GETHOST_PROTOS symbol,
926 which indicates to the C program that <netdb.h> supplies
635aebb7 927 prototypes for the various gethost*() functions.
781b178c
JH
928 See also netdbtype.U for probing for various netdb types.
929
4e0554ec
JH
930d_getitimer (d_getitimer.U):
931 This variable conditionally defines the HAS_GETITIMER symbol, which
932 indicates to the C program that the getitimer() routine is available.
933
781b178c
JH
934d_getlogin (d_getlogin.U):
935 This variable conditionally defines the HAS_GETLOGIN symbol, which
936 indicates to the C program that the getlogin() routine is available
937 to get the login name.
938
10bc17b6
JH
939d_getlogin_r (d_getlogin_r.U):
940 This variable conditionally defines the HAS_GETLOGIN_R symbol,
941 which indicates to the C program that the getlogin_r()
942 routine is available.
943
ad27e871
JH
944d_getmnt (d_getmnt.U):
945 This variable conditionally defines the HAS_GETMNT symbol, which
946 indicates to the C program that the getmnt() routine is available
947 to retrieve one or more mount info blocks by filename.
948
781b178c
JH
949d_getmntent (d_getmntent.U):
950 This variable conditionally defines the HAS_GETMNTENT symbol, which
951 indicates to the C program that the getmntent() routine is available
0617aed7 952 to iterate through mounted files to get their mount info.
781b178c
JH
953
954d_getnbyaddr (d_getnbyad.U):
955 This variable conditionally defines the HAS_GETNETBYADDR symbol, which
956 indicates to the C program that the getnetbyaddr() routine is available
957 to look up networks by their IP addresses.
958
959d_getnbyname (d_getnbynm.U):
960 This variable conditionally defines the HAS_GETNETBYNAME symbol, which
961 indicates to the C program that the getnetbyname() routine is available
962 to look up networks by their names.
963
964d_getnent (d_getnent.U):
965 This variable conditionally defines HAS_GETNETENT if getnetent() is
966 available to look up network names in some data base or another.
967
10bc17b6
JH
968d_getnetbyaddr_r (d_getnetbyaddr_r.U):
969 This variable conditionally defines the HAS_GETNETBYADDR_R symbol,
970 which indicates to the C program that the getnetbyaddr_r()
971 routine is available.
972
973d_getnetbyname_r (d_getnetbyname_r.U):
974 This variable conditionally defines the HAS_GETNETBYNAME_R symbol,
975 which indicates to the C program that the getnetbyname_r()
976 routine is available.
977
978d_getnetent_r (d_getnetent_r.U):
979 This variable conditionally defines the HAS_GETNETENT_R symbol,
980 which indicates to the C program that the getnetent_r()
981 routine is available.
982
781b178c
JH
983d_getnetprotos (d_getnetprotos.U):
984 This variable conditionally defines the HAS_GETNET_PROTOS symbol,
985 which indicates to the C program that <netdb.h> supplies
635aebb7 986 prototypes for the various getnet*() functions.
781b178c
JH
987 See also netdbtype.U for probing for various netdb types.
988
0c0643d0
JH
989d_getpagsz (d_getpagsz.U):
990 This variable conditionally defines HAS_GETPAGESIZE if getpagesize()
991 is available to get the system page size.
992
781b178c 993d_getpbyname (d_getprotby.U):
635aebb7
AL
994 This variable conditionally defines the HAS_GETPROTOBYNAME
995 symbol, which indicates to the C program that the
781b178c
JH
996 getprotobyname() routine is available to look up protocols
997 by their name.
998
999d_getpbynumber (d_getprotby.U):
635aebb7
AL
1000 This variable conditionally defines the HAS_GETPROTOBYNUMBER
1001 symbol, which indicates to the C program that the
781b178c
JH
1002 getprotobynumber() routine is available to look up protocols
1003 by their number.
1004
1005d_getpent (d_getpent.U):
1006 This variable conditionally defines HAS_GETPROTOENT if getprotoent() is
1007 available to look up protocols in some data base or another.
1008
1009d_getpgid (d_getpgid.U):
1010 This variable conditionally defines the HAS_GETPGID symbol, which
1011 indicates to the C program that the getpgid(pid) function
1012 is available to get the process group id.
1013
1014d_getpgrp2 (d_getpgrp2.U):
1015 This variable conditionally defines the HAS_GETPGRP2 symbol, which
1016 indicates to the C program that the getpgrp2() (as in DG/UX) routine
1017 is available to get the current process group.
1018
1019d_getpgrp (d_getpgrp.U):
1020 This variable conditionally defines HAS_GETPGRP if getpgrp() is
1021 available to get the current process group.
1022
1023d_getppid (d_getppid.U):
1024 This variable conditionally defines the HAS_GETPPID symbol, which
1025 indicates to the C program that the getppid() routine is available
1026 to get the parent process ID.
1027
1028d_getprior (d_getprior.U):
1029 This variable conditionally defines HAS_GETPRIORITY if getpriority()
1030 is available to get a process's priority.
1031
10bc17b6
JH
1032d_getprotobyname_r (d_getprotobyname_r.U):
1033 This variable conditionally defines the HAS_GETPROTOBYNAME_R symbol,
1034 which indicates to the C program that the getprotobyname_r()
1035 routine is available.
1036
1037d_getprotobynumber_r (d_getprotobynumber_r.U):
1038 This variable conditionally defines the HAS_GETPROTOBYNUMBER_R symbol,
1039 which indicates to the C program that the getprotobynumber_r()
1040 routine is available.
1041
1042d_getprotoent_r (d_getprotoent_r.U):
1043 This variable conditionally defines the HAS_GETPROTOENT_R symbol,
1044 which indicates to the C program that the getprotoent_r()
1045 routine is available.
1046
781b178c
JH
1047d_getprotoprotos (d_getprotoprotos.U):
1048 This variable conditionally defines the HAS_GETPROTO_PROTOS symbol,
1049 which indicates to the C program that <netdb.h> supplies
635aebb7 1050 prototypes for the various getproto*() functions.
781b178c
JH
1051 See also netdbtype.U for probing for various netdb types.
1052
3813c136
JH
1053d_getprpwnam (d_getprpwnam.U):
1054 This variable conditionally defines HAS_GETPRPWNAM if getprpwnam() is
1055 available to retrieve protected (shadow) password entries by name.
1056
781b178c
JH
1057d_getpwent (d_getpwent.U):
1058 This variable conditionally defines the HAS_GETPWENT symbol, which
1059 indicates to the C program that the getpwent() routine is available
1060 for sequential access of the passwd database.
1061
10bc17b6
JH
1062d_getpwent_r (d_getpwent_r.U):
1063 This variable conditionally defines the HAS_GETPWENT_R symbol,
1064 which indicates to the C program that the getpwent_r()
1065 routine is available.
1066
1067d_getpwnam_r (d_getpwnam_r.U):
1068 This variable conditionally defines the HAS_GETPWNAM_R symbol,
1069 which indicates to the C program that the getpwnam_r()
1070 routine is available.
1071
1072d_getpwuid_r (d_getpwuid_r.U):
1073 This variable conditionally defines the HAS_GETPWUID_R symbol,
1074 which indicates to the C program that the getpwuid_r()
1075 routine is available.
1076
781b178c 1077d_getsbyname (d_getsrvby.U):
635aebb7
AL
1078 This variable conditionally defines the HAS_GETSERVBYNAME
1079 symbol, which indicates to the C program that the
781b178c
JH
1080 getservbyname() routine is available to look up services
1081 by their name.
1082
1083d_getsbyport (d_getsrvby.U):
635aebb7
AL
1084 This variable conditionally defines the HAS_GETSERVBYPORT
1085 symbol, which indicates to the C program that the
781b178c
JH
1086 getservbyport() routine is available to look up services
1087 by their port.
1088
1089d_getsent (d_getsent.U):
1090 This variable conditionally defines HAS_GETSERVENT if getservent() is
1091 available to look up network services in some data base or another.
1092
10bc17b6
JH
1093d_getservbyname_r (d_getservbyname_r.U):
1094 This variable conditionally defines the HAS_GETSERVBYNAME_R symbol,
1095 which indicates to the C program that the getservbyname_r()
1096 routine is available.
1097
1098d_getservbyport_r (d_getservbyport_r.U):
1099 This variable conditionally defines the HAS_GETSERVBYPORT_R symbol,
1100 which indicates to the C program that the getservbyport_r()
1101 routine is available.
1102
1103d_getservent_r (d_getservent_r.U):
1104 This variable conditionally defines the HAS_GETSERVENT_R symbol,
1105 which indicates to the C program that the getservent_r()
1106 routine is available.
1107
781b178c
JH
1108d_getservprotos (d_getservprotos.U):
1109 This variable conditionally defines the HAS_GETSERV_PROTOS symbol,
1110 which indicates to the C program that <netdb.h> supplies
635aebb7 1111 prototypes for the various getserv*() functions.
781b178c
JH
1112 See also netdbtype.U for probing for various netdb types.
1113
781b178c
JH
1114d_getspnam (d_getspnam.U):
1115 This variable conditionally defines HAS_GETSPNAM if getspnam() is
1116 available to retrieve SysV shadow password entries by name.
1117
10bc17b6
JH
1118d_getspnam_r (d_getspnam_r.U):
1119 This variable conditionally defines the HAS_GETSPNAM_R symbol,
1120 which indicates to the C program that the getspnam_r()
1121 routine is available.
1122
781b178c
JH
1123d_gettimeod (d_ftime.U):
1124 This variable conditionally defines the HAS_GETTIMEOFDAY symbol, which
1125 indicates that the gettimeofday() system call exists (to obtain a
1126 sub-second accuracy clock). You should probably include <sys/resource.h>.
1127
10bc17b6
JH
1128d_gmtime_r (d_gmtime_r.U):
1129 This variable conditionally defines the HAS_GMTIME_R symbol,
1130 which indicates to the C program that the gmtime_r()
1131 routine is available.
1132
781b178c
JH
1133d_gnulibc (d_gnulibc.U):
1134 Defined if we're dealing with the GNU C Library.
1135
1136d_grpasswd (i_grp.U):
1137 This variable conditionally defines GRPASSWD, which indicates
1138 that struct group in <grp.h> contains gr_passwd.
1139
1140d_hasmntopt (d_hasmntopt.U):
1141 This variable conditionally defines the HAS_HASMNTOPT symbol, which
1142 indicates to the C program that the hasmntopt() routine is available
1143 to query the mount options of file systems.
1144
1145d_htonl (d_htonl.U):
1146 This variable conditionally defines HAS_HTONL if htonl() and its
1147 friends are available to do network order byte swapping.
1148
5c567d7d
JH
1149d_ilogbl (d_ilogbl.U):
1150 This variable conditionally defines the HAS_ILOGBL symbol, which
1151 indicates to the C program that the ilogbl() routine is available.
1152 If scalbnl is also present we can emulate frexpl.
1153
c95d0e17
GA
1154d_inc_version_list (inc_version_list.U):
1155 This variable conditionally defines PERL_INC_VERSION_LIST.
1156 It is set to undef when PERL_INC_VERSION_LIST is empty.
1157
781b178c
JH
1158d_index (d_strchr.U):
1159 This variable conditionally defines HAS_INDEX if index() and
1160 rindex() are available for string searching.
1161
1162d_inetaton (d_inetaton.U):
1163 This variable conditionally defines the HAS_INET_ATON symbol, which
1164 indicates to the C program that the inet_aton() function is available
1165 to parse IP address "dotted-quad" strings.
1166
13b3f787 1167d_int64_t (d_int64_t.U):
781b178c
JH
1168 This symbol will be defined if the C compiler supports int64_t.
1169
781b178c
JH
1170d_isascii (d_isascii.U):
1171 This variable conditionally defines the HAS_ISASCII constant,
1172 which indicates to the C program that isascii() is available.
1173
758a5d79
JH
1174d_isfinite (d_isfinite.U):
1175 This variable conditionally defines the HAS_ISFINITE symbol, which
1176 indicates to the C program that the isfinite() routine is available.
1177
1178d_isinf (d_isinf.U):
1179 This variable conditionally defines the HAS_ISINF symbol, which
1180 indicates to the C program that the isinf() routine is available.
1181
a3540c92
JH
1182d_isnan (d_isnan.U):
1183 This variable conditionally defines the HAS_ISNAN symbol, which
1184 indicates to the C program that the isnan() routine is available.
1185
1186d_isnanl (d_isnanl.U):
1187 This variable conditionally defines the HAS_ISNANL symbol, which
1188 indicates to the C program that the isnanl() routine is available.
1189
781b178c
JH
1190d_killpg (d_killpg.U):
1191 This variable conditionally defines the HAS_KILLPG symbol, which
1192 indicates to the C program that the killpg() routine is available
1193 to kill process groups.
1194
1195d_lchown (d_lchown.U):
1196 This variable conditionally defines the HAS_LCHOWN symbol, which
1197 indicates to the C program that the lchown() routine is available
1198 to operate on a symbolic link (instead of following the link).
1199
ca24dfc6
LV
1200d_ldbl_dig (d_ldbl_dig.U):
1201 This variable conditionally defines d_ldbl_dig if this system's
1202 header files provide LDBL_DIG, which is the number of significant
1203 digits in a long double precision number.
1204
781b178c
JH
1205d_link (d_link.U):
1206 This variable conditionally defines HAS_LINK if link() is
1207 available to create hard links.
1208
10bc17b6
JH
1209d_localtime_r (d_localtime_r.U):
1210 This variable conditionally defines the HAS_LOCALTIME_R symbol,
1211 which indicates to the C program that the localtime_r()
1212 routine is available.
1213
781b178c
JH
1214d_locconv (d_locconv.U):
1215 This variable conditionally defines HAS_LOCALECONV if localeconv() is
1216 available for numeric and monetary formatting conventions.
1217
781b178c
JH
1218d_lockf (d_lockf.U):
1219 This variable conditionally defines HAS_LOCKF if lockf() is
1220 available to do file locking.
1221
1222d_longdbl (d_longdbl.U):
635aebb7 1223 This variable conditionally defines HAS_LONG_DOUBLE if
781b178c
JH
1224 the long double type is supported.
1225
1226d_longlong (d_longlong.U):
635aebb7 1227 This variable conditionally defines HAS_LONG_LONG if
781b178c
JH
1228 the long long type is supported.
1229
c890dc6c
JH
1230d_lseekproto (d_lseekproto.U):
1231 This variable conditionally defines the HAS_LSEEK_PROTO symbol,
1232 which indicates to the C program that the system provides
1233 a prototype for the lseek() function. Otherwise, it is
1234 up to the program to supply one.
1235
781b178c
JH
1236d_lstat (d_lstat.U):
1237 This variable conditionally defines HAS_LSTAT if lstat() is
1238 available to do file stats on symbolic links.
1239
792d8dab
JH
1240d_madvise (d_madvise.U):
1241 This variable conditionally defines HAS_MADVISE if madvise() is
1242 available to map a file into memory.
1243
7dd121ae
MB
1244d_malloc_size (d_malloc_size.U):
1245 This symbol, if defined, indicates that the malloc_size
1246 routine is available for use.
1247
1248d_malloc_good_size (d_malloc_good_size.U):
1249 This symbol, if defined, indicates that the malloc_good_size
1250 routine is available for use.
1251
781b178c
JH
1252d_mblen (d_mblen.U):
1253 This variable conditionally defines the HAS_MBLEN symbol, which
1254 indicates to the C program that the mblen() routine is available
1255 to find the number of bytes in a multibye character.
1256
1257d_mbstowcs (d_mbstowcs.U):
1258 This variable conditionally defines the HAS_MBSTOWCS symbol, which
1259 indicates to the C program that the mbstowcs() routine is available
1260 to convert a multibyte string into a wide character string.
1261
1262d_mbtowc (d_mbtowc.U):
1263 This variable conditionally defines the HAS_MBTOWC symbol, which
1264 indicates to the C program that the mbtowc() routine is available
1265 to convert multibyte to a wide character.
1266
1267d_memchr (d_memchr.U):
1268 This variable conditionally defines the HAS_MEMCHR symbol, which
1269 indicates to the C program that the memchr() routine is available
1270 to locate characters within a C string.
1271
1272d_memcmp (d_memcmp.U):
1273 This variable conditionally defines the HAS_MEMCMP symbol, which
1274 indicates to the C program that the memcmp() routine is available
1275 to compare blocks of memory.
1276
1277d_memcpy (d_memcpy.U):
1278 This variable conditionally defines the HAS_MEMCPY symbol, which
1279 indicates to the C program that the memcpy() routine is available
1280 to copy blocks of memory.
1281
1282d_memmove (d_memmove.U):
1283 This variable conditionally defines the HAS_MEMMOVE symbol, which
1284 indicates to the C program that the memmove() routine is available
1285 to copy potentatially overlapping blocks of memory.
1286
1287d_memset (d_memset.U):
1288 This variable conditionally defines the HAS_MEMSET symbol, which
1289 indicates to the C program that the memset() routine is available
1290 to set blocks of memory.
1291
1292d_mkdir (d_mkdir.U):
1293 This variable conditionally defines the HAS_MKDIR symbol, which
1294 indicates to the C program that the mkdir() routine is available
209e5c0a 1295 to create directories..
781b178c 1296
fe749a9f
JH
1297d_mkdtemp (d_mkdtemp.U):
1298 This variable conditionally defines the HAS_MKDTEMP symbol, which
1299 indicates to the C program that the mkdtemp() routine is available
1300 to exclusively create a uniquely named temporary directory.
1301
781b178c
JH
1302d_mkfifo (d_mkfifo.U):
1303 This variable conditionally defines the HAS_MKFIFO symbol, which
1304 indicates to the C program that the mkfifo() routine is available.
1305
fe749a9f
JH
1306d_mkstemp (d_mkstemp.U):
1307 This variable conditionally defines the HAS_MKSTEMP symbol, which
1308 indicates to the C program that the mkstemp() routine is available
1309 to exclusively create and open a uniquely named temporary file.
1310
1311d_mkstemps (d_mkstemps.U):
1312 This variable conditionally defines the HAS_MKSTEMPS symbol, which
1313 indicates to the C program that the mkstemps() routine is available
1314 to exclusively create and open a uniquely named (with a suffix)
1315 temporary file.
1316
781b178c
JH
1317d_mktime (d_mktime.U):
1318 This variable conditionally defines the HAS_MKTIME symbol, which
1319 indicates to the C program that the mktime() routine is available.
1320
fe749a9f
JH
1321d_mmap (d_mmap.U):
1322 This variable conditionally defines HAS_MMAP if mmap() is
1323 available to map a file into memory.
1324
a3540c92
JH
1325d_modfl (d_modfl.U):
1326 This variable conditionally defines the HAS_MODFL symbol, which
1327 indicates to the C program that the modfl() routine is available.
1328
e67aeab1
JH
1329d_modfl_pow32_bug (d_modfl.U):
1330 This variable conditionally defines the HAS_MODFL_POW32_BUG symbol,
1331 which indicates that modfl() is broken for long doubles >= pow(2, 32).
1332 For example from 4294967303.150000 one would get 4294967302.000000
1333 and 1.150000. The bug has been seen in certain versions of glibc,
1334 release 2.2.2 is known to be okay.
1335
44b94491
MB
1336d_modflproto (d_modfl.U):
1337 This symbol, if defined, indicates that the system provides
1338 a prototype for the modfl() function. Otherwise, it is up
1339 to the program to supply one. C99 says it should be
1340 long double modfl(long double, long double *);
1341
fe749a9f
JH
1342d_mprotect (d_mprotect.U):
1343 This variable conditionally defines HAS_MPROTECT if mprotect() is
1344 available to modify the access protection of a memory mapped file.
1345
781b178c
JH
1346d_msg (d_msg.U):
1347 This variable conditionally defines the HAS_MSG symbol, which
1348 indicates that the entire msg*(2) library is present.
1349
1350d_msg_ctrunc (d_socket.U):
1351 This variable conditionally defines the HAS_MSG_CTRUNC symbol,
1352 which indicates that the MSG_CTRUNC is available. #ifdef is
1353 not enough because it may be an enum, glibc has been known to do this.
1354
1355d_msg_dontroute (d_socket.U):
1356 This variable conditionally defines the HAS_MSG_DONTROUTE symbol,
1357 which indicates that the MSG_DONTROUTE is available. #ifdef is
1358 not enough because it may be an enum, glibc has been known to do this.
1359
1360d_msg_oob (d_socket.U):
1361 This variable conditionally defines the HAS_MSG_OOB symbol,
1362 which indicates that the MSG_OOB is available. #ifdef is
1363 not enough because it may be an enum, glibc has been known to do this.
1364
1365d_msg_peek (d_socket.U):
1366 This variable conditionally defines the HAS_MSG_PEEK symbol,
1367 which indicates that the MSG_PEEK is available. #ifdef is
1368 not enough because it may be an enum, glibc has been known to do this.
1369
1370d_msg_proxy (d_socket.U):
1371 This variable conditionally defines the HAS_MSG_PROXY symbol,
1372 which indicates that the MSG_PROXY is available. #ifdef is
1373 not enough because it may be an enum, glibc has been known to do this.
1374
1375d_msgctl (d_msgctl.U):
1376 This variable conditionally defines the HAS_MSGCTL symbol, which
1377 indicates to the C program that the msgctl() routine is available.
1378
1379d_msgget (d_msgget.U):
1380 This variable conditionally defines the HAS_MSGGET symbol, which
1381 indicates to the C program that the msgget() routine is available.
1382
4e0554ec
JH
1383d_msghdr_s (d_msghdr_s.U):
1384 This variable conditionally defines the HAS_STRUCT_MSGHDR symbol,
1385 which indicates that the struct msghdr is supported.
1386
781b178c
JH
1387d_msgrcv (d_msgrcv.U):
1388 This variable conditionally defines the HAS_MSGRCV symbol, which
1389 indicates to the C program that the msgrcv() routine is available.
1390
1391d_msgsnd (d_msgsnd.U):
1392 This variable conditionally defines the HAS_MSGSND symbol, which
1393 indicates to the C program that the msgsnd() routine is available.
1394
fe749a9f
JH
1395d_msync (d_msync.U):
1396 This variable conditionally defines HAS_MSYNC if msync() is
1397 available to synchronize a mapped file.
1398
1399d_munmap (d_munmap.U):
1400 This variable conditionally defines HAS_MUNMAP if munmap() is
1401 available to unmap a region mapped by mmap().
1402
781b178c
JH
1403d_mymalloc (mallocsrc.U):
1404 This variable conditionally defines MYMALLOC in case other parts
1405 of the source want to take special action if MYMALLOC is used.
1406 This may include different sorts of profiling or error detection.
1407
781b178c
JH
1408d_nice (d_nice.U):
1409 This variable conditionally defines the HAS_NICE symbol, which
1410 indicates to the C program that the nice() routine is available.
1411
2765b840
JH
1412d_nl_langinfo (d_nl_langinfo.U):
1413 This variable conditionally defines the HAS_NL_LANGINFO symbol, which
1414 indicates to the C program that the nl_langinfo() routine is available.
1415
78691af5 1416d_nv_preserves_uv (perlxv.U):
cce08f5b
JH
1417 This variable indicates whether a variable of type nvtype
1418 can preserve all the bits a variable of type uvtype.
1419
f607920a
CB
1420d_nv_zero_is_allbits_zero (perlxv.U):
1421 This variable indicates whether a variable of type nvtype
1422 stores 0.0 in memory as all bits zero.
1423
c890dc6c 1424d_off64_t (d_off64_t.U):
781b178c
JH
1425 This symbol will be defined if the C compiler supports off64_t.
1426
781b178c
JH
1427d_old_pthread_create_joinable (d_pthrattrj.U):
1428 This variable conditionally defines pthread_create_joinable.
1429 undef if pthread.h defines PTHREAD_CREATE_JOINABLE.
1430
1431d_oldpthreads (usethreads.U):
1432 This variable conditionally defines the OLD_PTHREADS_API symbol,
1433 and indicates that Perl should be built to use the old
8c09e4ca 1434 draft POSIX threads API. This is only potentially meaningful if
781b178c
JH
1435 usethreads is set.
1436
1437d_oldsock (d_socket.U):
1438 This variable conditionally defines the OLDSOCKET symbol, which
1439 indicates that the BSD socket interface is based on 4.1c and not 4.2.
1440
1441d_open3 (d_open3.U):
1442 This variable conditionally defines the HAS_OPEN3 manifest constant,
1443 which indicates to the C program that the 3 argument version of
1444 the open(2) function is available.
1445
781b178c
JH
1446d_pathconf (d_pathconf.U):
1447 This variable conditionally defines the HAS_PATHCONF symbol, which
1448 indicates to the C program that the pathconf() routine is available
1449 to determine file-system related limits and options associated
1450 with a given filename.
1451
1452d_pause (d_pause.U):
1453 This variable conditionally defines the HAS_PAUSE symbol, which
1454 indicates to the C program that the pause() routine is available
1455 to suspend a process until a signal is received.
1456
3b777bb4
GS
1457d_perl_otherlibdirs (otherlibdirs.U):
1458 This variable conditionally defines PERL_OTHERLIBDIRS, which
1459 contains a colon-separated set of paths for the perl binary to
1460 include in @INC. See also otherlibdirs.
1461
781b178c
JH
1462d_phostname (d_gethname.U):
1463 This variable conditionally defines the HAS_PHOSTNAME symbol, which
1464 contains the shell command which, when fed to popen(), may be
1465 used to derive the host name.
1466
1467d_pipe (d_pipe.U):
1468 This variable conditionally defines the HAS_PIPE symbol, which
1469 indicates to the C program that the pipe() routine is available
1470 to create an inter-process channel.
1471
1472d_poll (d_poll.U):
1473 This variable conditionally defines the HAS_POLL symbol, which
1474 indicates to the C program that the poll() routine is available
1475 to poll active file descriptors.
1476
1477d_portable (d_portable.U):
1478 This variable conditionally defines the PORTABLE symbol, which
1479 indicates to the C program that it should not assume that it is
1480 running on the machine it was compiled on.
1481
4d54317a
JH
1482d_PRId64 (quadfio.U):
1483 This variable conditionally defines the PERL_PRId64 symbol, which
1484 indiciates that stdio has a symbol to print 64-bit decimal numbers.
1485
1486d_PRIeldbl (longdblfio.U):
1487 This variable conditionally defines the PERL_PRIfldbl symbol, which
1488 indiciates that stdio has a symbol to print long doubles.
1489
1490d_PRIEUldbl (longdblfio.U):
1491 This variable conditionally defines the PERL_PRIfldbl symbol, which
1492 indiciates that stdio has a symbol to print long doubles.
1493 The 'U' in the name is to separate this from d_PRIeldbl so that even
1494 case-blind systems can see the difference.
1495
1496d_PRIfldbl (longdblfio.U):
1497 This variable conditionally defines the PERL_PRIfldbl symbol, which
1498 indiciates that stdio has a symbol to print long doubles.
1499
1500d_PRIFUldbl (longdblfio.U):
1501 This variable conditionally defines the PERL_PRIfldbl symbol, which
1502 indiciates that stdio has a symbol to print long doubles.
1503 The 'U' in the name is to separate this from d_PRIfldbl so that even
1504 case-blind systems can see the difference.
1505
1506d_PRIgldbl (longdblfio.U):
1507 This variable conditionally defines the PERL_PRIfldbl symbol, which
1508 indiciates that stdio has a symbol to print long doubles.
1509
1510d_PRIGUldbl (longdblfio.U):
1511 This variable conditionally defines the PERL_PRIfldbl symbol, which
1512 indiciates that stdio has a symbol to print long doubles.
1513 The 'U' in the name is to separate this from d_PRIgldbl so that even
1514 case-blind systems can see the difference.
1515
1516d_PRIi64 (quadfio.U):
1517 This variable conditionally defines the PERL_PRIi64 symbol, which
1518 indiciates that stdio has a symbol to print 64-bit decimal numbers.
1519
1520d_PRIo64 (quadfio.U):
1521 This variable conditionally defines the PERL_PRIo64 symbol, which
1522 indiciates that stdio has a symbol to print 64-bit octal numbers.
1523
1524d_PRIu64 (quadfio.U):
1525 This variable conditionally defines the PERL_PRIu64 symbol, which
1526 indiciates that stdio has a symbol to print 64-bit unsigned decimal
1527 numbers.
1528
1529d_PRIx64 (quadfio.U):
1530 This variable conditionally defines the PERL_PRIx64 symbol, which
1531 indiciates that stdio has a symbol to print 64-bit hexadecimal numbers.
1532
1533d_PRIXU64 (quadfio.U):
1534 This variable conditionally defines the PERL_PRIXU64 symbol, which
1535 indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers.
1536 The 'U' in the name is to separate this from d_PRIx64 so that even
1537 case-blind systems can see the difference.
1538
428dc699
JH
1539d_procselfexe (d_procselfexe.U):
1540 Defined if $procselfexe is symlink to the absolute
1541 pathname of the executing program.
1542
d6483fcc
JH
1543d_pthread_atfork (d_pthread_atfork.U):
1544 This variable conditionally defines the HAS_PTHREAD_ATFORK symbol,
1545 which indicates to the C program that the pthread_atfork()
1546 routine is available.
1547
505656d3
JH
1548d_pthread_attr_setscope (d_pthread_attr_ss.U):
1549 This variable conditionally defines HAS_PTHREAD_ATTR_SETSCOPE if
1550 pthread_attr_setscope() is available to set the contention scope
1551 attribute of a thread attribute object.
1552
781b178c
JH
1553d_pthread_yield (d_pthread_y.U):
1554 This variable conditionally defines the HAS_PTHREAD_YIELD
1555 symbol if the pthread_yield routine is available to yield
1556 the execution of the current thread.
1557
1558d_pwage (i_pwd.U):
1559 This variable conditionally defines PWAGE, which indicates
1560 that struct passwd contains pw_age.
1561
1562d_pwchange (i_pwd.U):
1563 This variable conditionally defines PWCHANGE, which indicates
1564 that struct passwd contains pw_change.
1565
1566d_pwclass (i_pwd.U):
1567 This variable conditionally defines PWCLASS, which indicates
1568 that struct passwd contains pw_class.
1569
1570d_pwcomment (i_pwd.U):
1571 This variable conditionally defines PWCOMMENT, which indicates
1572 that struct passwd contains pw_comment.
1573
1574d_pwexpire (i_pwd.U):
1575 This variable conditionally defines PWEXPIRE, which indicates
1576 that struct passwd contains pw_expire.
1577
1578d_pwgecos (i_pwd.U):
1579 This variable conditionally defines PWGECOS, which indicates
1580 that struct passwd contains pw_gecos.
1581
1582d_pwpasswd (i_pwd.U):
1583 This variable conditionally defines PWPASSWD, which indicates
1584 that struct passwd contains pw_passwd.
1585
1586d_pwquota (i_pwd.U):
1587 This variable conditionally defines PWQUOTA, which indicates
1588 that struct passwd contains pw_quota.
1589
792d8dab
JH
1590d_qgcvt (d_qgcvt.U):
1591 This variable conditionally defines the HAS_QGCVT symbol, which
1592 indicates to the C program that the qgcvt() routine is available.
1593
de1c2614
JH
1594d_quad (quadtype.U):
1595 This variable, if defined, tells that there's a 64-bit integer type,
1596 quadtype.
1597
10bc17b6
JH
1598d_random_r (d_random_r.U):
1599 This variable conditionally defines the HAS_RANDOM_R symbol,
1600 which indicates to the C program that the random_r()
1601 routine is available.
1602
1603d_readdir64_r (d_readdir64_r.U):
1604 This variable conditionally defines the HAS_READDIR64_R symbol,
1605 which indicates to the C program that the readdir64_r()
1606 routine is available.
1607
781b178c
JH
1608d_readdir (d_readdir.U):
1609 This variable conditionally defines HAS_READDIR if readdir() is
1610 available to read directory entries.
1611
10bc17b6
JH
1612d_readdir_r (d_readdir_r.U):
1613 This variable conditionally defines the HAS_READDIR_R symbol,
1614 which indicates to the C program that the readdir_r()
1615 routine is available.
1616
781b178c
JH
1617d_readlink (d_readlink.U):
1618 This variable conditionally defines the HAS_READLINK symbol, which
1619 indicates to the C program that the readlink() routine is available
1620 to read the value of a symbolic link.
1621
4e0554ec
JH
1622d_readv (d_readv.U):
1623 This variable conditionally defines the HAS_READV symbol, which
1624 indicates to the C program that the readv() routine is available.
1625
1626d_recvmsg (d_recvmsg.U):
1627 This variable conditionally defines the HAS_RECVMSG symbol, which
1628 indicates to the C program that the recvmsg() routine is available.
1629
781b178c
JH
1630d_rename (d_rename.U):
1631 This variable conditionally defines the HAS_RENAME symbol, which
1632 indicates to the C program that the rename() routine is available
1633 to rename files.
1634
1635d_rewinddir (d_readdir.U):
1636 This variable conditionally defines HAS_REWINDDIR if rewinddir() is
1637 available.
1638
1639d_rmdir (d_rmdir.U):
1640 This variable conditionally defines HAS_RMDIR if rmdir() is
1641 available to remove directories.
1642
1643d_safebcpy (d_safebcpy.U):
1644 This variable conditionally defines the HAS_SAFE_BCOPY symbol if
b6cc3bc4
AD
1645 the bcopy() routine can do overlapping copies. Normally, you
1646 should probably use memmove().
781b178c
JH
1647
1648d_safemcpy (d_safemcpy.U):
1649 This variable conditionally defines the HAS_SAFE_MEMCPY symbol if
1650 the memcpy() routine can do overlapping copies.
b6cc3bc4 1651 For overlapping copies, memmove() should be used, if available.
781b178c
JH
1652
1653d_sanemcmp (d_sanemcmp.U):
1654 This variable conditionally defines the HAS_SANE_MEMCMP symbol if
1655 the memcpy() routine is available and can be used to compare relative
1656 magnitudes of chars with their high bits set.
1657
ef9f17be
JH
1658d_sbrkproto (d_sbrkproto.U):
1659 This variable conditionally defines the HAS_SBRK_PROTO symbol,
1660 which indicates to the C program that the system provides
1661 a prototype for the sbrk() function. Otherwise, it is
1662 up to the program to supply one.
1663
5c567d7d
JH
1664d_scalbnl (d_scalbnl.U):
1665 This variable conditionally defines the HAS_SCALBNL symbol, which
1666 indicates to the C program that the scalbnl() routine is available.
1667 If ilogbl is also present we can emulate frexpl.
1668
781b178c
JH
1669d_sched_yield (d_pthread_y.U):
1670 This variable conditionally defines the HAS_SCHED_YIELD
1671 symbol if the sched_yield routine is available to yield
1672 the execution of the current thread.
1673
1674d_scm_rights (d_socket.U):
1675 This variable conditionally defines the HAS_SCM_RIGHTS symbol,
1676 which indicates that the SCM_RIGHTS is available. #ifdef is
1677 not enough because it may be an enum, glibc has been known to do this.
1678
4d54317a
JH
1679d_SCNfldbl (longdblfio.U):
1680 This variable conditionally defines the PERL_PRIfldbl symbol, which
1681 indiciates that stdio has a symbol to scan long doubles.
1682
781b178c
JH
1683d_seekdir (d_readdir.U):
1684 This variable conditionally defines HAS_SEEKDIR if seekdir() is
1685 available.
1686
1687d_select (d_select.U):
1688 This variable conditionally defines HAS_SELECT if select() is
1689 available to select active file descriptors. A <sys/time.h>
1690 inclusion may be necessary for the timeout field.
1691
1692d_sem (d_sem.U):
1693 This variable conditionally defines the HAS_SEM symbol, which
1694 indicates that the entire sem*(2) library is present.
1695
1696d_semctl (d_semctl.U):
1697 This variable conditionally defines the HAS_SEMCTL symbol, which
1698 indicates to the C program that the semctl() routine is available.
1699
1700d_semctl_semid_ds (d_union_semun.U):
1701 This variable conditionally defines USE_SEMCTL_SEMID_DS, which
1702 indicates that struct semid_ds * is to be used for semctl IPC_STAT.
1703
1704d_semctl_semun (d_union_semun.U):
1705 This variable conditionally defines USE_SEMCTL_SEMUN, which
1706 indicates that union semun is to be used for semctl IPC_STAT.
1707
1708d_semget (d_semget.U):
1709 This variable conditionally defines the HAS_SEMGET symbol, which
1710 indicates to the C program that the semget() routine is available.
1711
1712d_semop (d_semop.U):
1713 This variable conditionally defines the HAS_SEMOP symbol, which
1714 indicates to the C program that the semop() routine is available.
1715
4e0554ec
JH
1716d_sendmsg (d_sendmsg.U):
1717 This variable conditionally defines the HAS_SENDMSG symbol, which
1718 indicates to the C program that the sendmsg() routine is available.
1719
781b178c
JH
1720d_setegid (d_setegid.U):
1721 This variable conditionally defines the HAS_SETEGID symbol, which
1722 indicates to the C program that the setegid() routine is available
1723 to change the effective gid of the current program.
1724
1725d_seteuid (d_seteuid.U):
1726 This variable conditionally defines the HAS_SETEUID symbol, which
1727 indicates to the C program that the seteuid() routine is available
1728 to change the effective uid of the current program.
1729
1730d_setgrent (d_setgrent.U):
1731 This variable conditionally defines the HAS_SETGRENT symbol, which
1732 indicates to the C program that the setgrent() routine is available
1733 for initializing sequential access to the group database.
1734
10bc17b6
JH
1735d_setgrent_r (d_setgrent_r.U):
1736 This variable conditionally defines the HAS_SETGRENT_R symbol,
1737 which indicates to the C program that the setgrent_r()
1738 routine is available.
1739
781b178c
JH
1740d_setgrps (d_setgrps.U):
1741 This variable conditionally defines the HAS_SETGROUPS symbol, which
1742 indicates to the C program that the setgroups() routine is available
1743 to set the list of process groups.
1744
1745d_sethent (d_sethent.U):
1746 This variable conditionally defines HAS_SETHOSTENT if sethostent() is
1747 available.
1748
10bc17b6
JH
1749d_sethostent_r (d_sethostent_r.U):
1750 This variable conditionally defines the HAS_SETHOSTENT_R symbol,
1751 which indicates to the C program that the sethostent_r()
1752 routine is available.
1753
4e0554ec
JH
1754d_setitimer (d_setitimer.U):
1755 This variable conditionally defines the HAS_SETITIMER symbol, which
1756 indicates to the C program that the setitimer() routine is available.
1757
781b178c
JH
1758d_setlinebuf (d_setlnbuf.U):
1759 This variable conditionally defines the HAS_SETLINEBUF symbol, which
1760 indicates to the C program that the setlinebuf() routine is available
1761 to change stderr or stdout from block-buffered or unbuffered to a
1762 line-buffered mode.
1763
1764d_setlocale (d_setlocale.U):
1765 This variable conditionally defines HAS_SETLOCALE if setlocale() is
1766 available to handle locale-specific ctype implementations.
1767
10bc17b6
JH
1768d_setlocale_r (d_setlocale_r.U):
1769 This variable conditionally defines the HAS_SETLOCALE_R symbol,
1770 which indicates to the C program that the setlocale_r()
1771 routine is available.
1772
781b178c
JH
1773d_setnent (d_setnent.U):
1774 This variable conditionally defines HAS_SETNETENT if setnetent() is
1775 available.
1776
10bc17b6
JH
1777d_setnetent_r (d_setnetent_r.U):
1778 This variable conditionally defines the HAS_SETNETENT_R symbol,
1779 which indicates to the C program that the setnetent_r()
1780 routine is available.
1781
781b178c
JH
1782d_setpent (d_setpent.U):
1783 This variable conditionally defines HAS_SETPROTOENT if setprotoent() is
1784 available.
1785
1786d_setpgid (d_setpgid.U):
1787 This variable conditionally defines the HAS_SETPGID symbol if the
1788 setpgid(pid, gpid) function is available to set process group ID.
1789
1790d_setpgrp2 (d_setpgrp2.U):
1791 This variable conditionally defines the HAS_SETPGRP2 symbol, which
1792 indicates to the C program that the setpgrp2() (as in DG/UX) routine
1793 is available to set the current process group.
1794
1795d_setpgrp (d_setpgrp.U):
1796 This variable conditionally defines HAS_SETPGRP if setpgrp() is
1797 available to set the current process group.
1798
1799d_setprior (d_setprior.U):
1800 This variable conditionally defines HAS_SETPRIORITY if setpriority()
1801 is available to set a process's priority.
1802
af960fef
JH
1803d_setproctitle (d_setproctitle.U):
1804 This variable conditionally defines the HAS_SETPROCTITLE symbol,
1805 which indicates to the C program that the setproctitle() routine
1806 is available.
1807
10bc17b6
JH
1808d_setprotoent_r (d_setprotoent_r.U):
1809 This variable conditionally defines the HAS_SETPROTOENT_R symbol,
1810 which indicates to the C program that the setprotoent_r()
1811 routine is available.
1812
781b178c
JH
1813d_setpwent (d_setpwent.U):
1814 This variable conditionally defines the HAS_SETPWENT symbol, which
1815 indicates to the C program that the setpwent() routine is available
1816 for initializing sequential access to the passwd database.
1817
10bc17b6
JH
1818d_setpwent_r (d_setpwent_r.U):
1819 This variable conditionally defines the HAS_SETPWENT_R symbol,
1820 which indicates to the C program that the setpwent_r()
1821 routine is available.
1822
781b178c
JH
1823d_setregid (d_setregid.U):
1824 This variable conditionally defines HAS_SETREGID if setregid() is
1825 available to change the real and effective gid of the current
1826 process.
1827
1828d_setresgid (d_setregid.U):
1829 This variable conditionally defines HAS_SETRESGID if setresgid() is
1830 available to change the real, effective and saved gid of the current
1831 process.
1832
1833d_setresuid (d_setreuid.U):
1834 This variable conditionally defines HAS_SETREUID if setresuid() is
1835 available to change the real, effective and saved uid of the current
1836 process.
1837
1838d_setreuid (d_setreuid.U):
1839 This variable conditionally defines HAS_SETREUID if setreuid() is
1840 available to change the real and effective uid of the current
1841 process.
1842
1843d_setrgid (d_setrgid.U):
1844 This variable conditionally defines the HAS_SETRGID symbol, which
1845 indicates to the C program that the setrgid() routine is available
1846 to change the real gid of the current program.
1847
1848d_setruid (d_setruid.U):
1849 This variable conditionally defines the HAS_SETRUID symbol, which
1850 indicates to the C program that the setruid() routine is available
1851 to change the real uid of the current program.
1852
1853d_setsent (d_setsent.U):
1854 This variable conditionally defines HAS_SETSERVENT if setservent() is
1855 available.
1856
10bc17b6
JH
1857d_setservent_r (d_setservent_r.U):
1858 This variable conditionally defines the HAS_SETSERVENT_R symbol,
1859 which indicates to the C program that the setservent_r()
1860 routine is available.
1861
781b178c
JH
1862d_setsid (d_setsid.U):
1863 This variable conditionally defines HAS_SETSID if setsid() is
1864 available to set the process group ID.
1865
781b178c
JH
1866d_setvbuf (d_setvbuf.U):
1867 This variable conditionally defines the HAS_SETVBUF symbol, which
1868 indicates to the C program that the setvbuf() routine is available
1869 to change buffering on an open stdio stream.
1870
1871d_sfio (d_sfio.U):
1872 This variable conditionally defines the USE_SFIO symbol,
1873 and indicates whether sfio is available (and should be used).
1874
1875d_shm (d_shm.U):
1876 This variable conditionally defines the HAS_SHM symbol, which
1877 indicates that the entire shm*(2) library is present.
1878
1879d_shmat (d_shmat.U):
1880 This variable conditionally defines the HAS_SHMAT symbol, which
1881 indicates to the C program that the shmat() routine is available.
1882
1883d_shmatprototype (d_shmat.U):
635aebb7 1884 This variable conditionally defines the HAS_SHMAT_PROTOTYPE
781b178c
JH
1885 symbol, which indicates that sys/shm.h has a prototype for
1886 shmat.
1887
1888d_shmctl (d_shmctl.U):
1889 This variable conditionally defines the HAS_SHMCTL symbol, which
1890 indicates to the C program that the shmctl() routine is available.
1891
1892d_shmdt (d_shmdt.U):
1893 This variable conditionally defines the HAS_SHMDT symbol, which
1894 indicates to the C program that the shmdt() routine is available.
1895
1896d_shmget (d_shmget.U):
1897 This variable conditionally defines the HAS_SHMGET symbol, which
1898 indicates to the C program that the shmget() routine is available.
1899
1900d_sigaction (d_sigaction.U):
1901 This variable conditionally defines the HAS_SIGACTION symbol, which
1902 indicates that the Vr4 sigaction() routine is available.
1903
983dbef6
JH
1904d_sigprocmask (d_sigprocmask.U):
1905 This variable conditionally defines HAS_SIGPROCMASK
1906 if sigprocmask() is available to examine or change the signal mask
1907 of the calling process.
1908
781b178c
JH
1909d_sigsetjmp (d_sigsetjmp.U):
1910 This variable conditionally defines the HAS_SIGSETJMP symbol,
1911 which indicates that the sigsetjmp() routine is available to
1912 call setjmp() and optionally save the process's signal mask.
1913
c95d0e17
GA
1914d_sitearch (sitearch.U):
1915 This variable conditionally defines SITEARCH to hold the pathname
1916 of architecture-dependent library files for $package. If
1917 $sitearch is the same as $archlib, then this is set to undef.
1918
49a78c82
JH
1919d_sockatmark (d_sockatmark.U):
1920 This variable conditionally defines the HAS_SOCKATMARK symbol, which
1921 indicates to the C program that the sockatmark() routine is available.
1922
5af95cda
JH
1923d_sockatmarkproto (d_sockatmarkproto.U):
1924 This variable conditionally defines the HAS_SOCKATMARK_PROTO symbol,
1925 which indicates to the C program that the system provides
1926 a prototype for the sockatmark() function. Otherwise, it is
1927 up to the program to supply one.
1928
781b178c
JH
1929d_socket (d_socket.U):
1930 This variable conditionally defines HAS_SOCKET, which indicates
1931 that the BSD socket interface is supported.
1932
13b3f787
JH
1933d_socklen_t (d_socklen_t.U):
1934 This symbol will be defined if the C compiler supports socklen_t.
1935
781b178c
JH
1936d_sockpair (d_socket.U):
1937 This variable conditionally defines the HAS_SOCKETPAIR symbol, which
1938 indicates that the BSD socketpair() is supported.
1939
6b356c8e
JH
1940d_socks5_init (d_socks5_init.U):
1941 This variable conditionally defines the HAS_SOCKS5_INIT symbol, which
1942 indicates to the C program that the socks5_init() routine is available.
1943
78821a22
NC
1944d_sprintf_returns_strlen (d_sprintf_returns_strlen.U):
1945 This variable defines whether sprintf returns the length of the string
1946 (as per the ANSI spec). Some C libraries retain compatibility with
1947 pre-ANSI C and return a pointer to the passed in buffer; for these
1948 this variable will be undef.
1949
68d4903c
JH
1950d_sqrtl (d_sqrtl.U):
1951 This variable conditionally defines the HAS_SQRTL symbol, which
1952 indicates to the C program that the sqrtl() routine is available.
1953
10bc17b6
JH
1954d_srand48_r (d_srand48_r.U):
1955 This variable conditionally defines the HAS_SRAND48_R symbol,
1956 which indicates to the C program that the srand48_r()
1957 routine is available.
1958
1959d_srandom_r (d_srandom_r.U):
1960 This variable conditionally defines the HAS_SRANDOM_R symbol,
1961 which indicates to the C program that the srandom_r()
1962 routine is available.
1963
eef837ea
JH
1964d_sresgproto (d_sresgproto.U):
1965 This variable conditionally defines the HAS_SETRESGID_PROTO symbol,
1966 which indicates to the C program that the system provides
1967 a prototype for the setresgid() function. Otherwise, it is
1968 up to the program to supply one.
1969
640374d0
JH
1970d_sresuproto (d_sresuproto.U):
1971 This variable conditionally defines the HAS_SETRESUID_PROTO symbol,
1972 which indicates to the C program that the system provides
1973 a prototype for the setresuid() function. Otherwise, it is
1974 up to the program to supply one.
1975
781b178c
JH
1976d_statblks (d_statblks.U):
1977 This variable conditionally defines USE_STAT_BLOCKS
1978 if this system has a stat structure declaring
1979 st_blksize and st_blocks.
1980
ad27e871 1981d_statfs_f_flags (d_statfs_f_flags.U):
0545a864 1982 This variable conditionally defines the HAS_STRUCT_STATFS_F_FLAGS
781b178c
JH
1983 symbol, which indicates to struct statfs from has f_flags member.
1984 This kind of struct statfs is coming from sys/mount.h (BSD),
1985 not from sys/statfs.h (SYSV).
1986
ad27e871 1987d_statfs_s (d_statfs_s.U):
0545a864
JH
1988 This variable conditionally defines the HAS_STRUCT_STATFS symbol,
1989 which indicates that the struct statfs is supported.
1990
781b178c
JH
1991d_statvfs (d_statvfs.U):
1992 This variable conditionally defines the HAS_STATVFS symbol, which
1993 indicates to the C program that the statvfs() routine is available.
1994
1995d_stdio_cnt_lval (d_stdstdio.U):
1996 This variable conditionally defines STDIO_CNT_LVALUE if the
1997 FILE_cnt macro can be used as an lvalue.
1998
1999d_stdio_ptr_lval (d_stdstdio.U):
2000 This variable conditionally defines STDIO_PTR_LVALUE if the
2001 FILE_ptr macro can be used as an lvalue.
2002
a7ffa9b9
NC
2003d_stdio_ptr_lval_nochange_cnt (d_stdstdio.U):
2004 This symbol is defined if using the FILE_ptr macro as an lvalue
2005 to increase the pointer by n leaves File_cnt(fp) unchanged.
2006
2007d_stdio_ptr_lval_sets_cnt (d_stdstdio.U):
2008 This symbol is defined if using the FILE_ptr macro as an lvalue
2009 to increase the pointer by n has the side effect of decreasing the
2010 value of File_cnt(fp) by n.
2011
781b178c
JH
2012d_stdio_stream_array (stdio_streams.U):
2013 This variable tells whether there is an array holding
2014 the stdio streams.
2015
2016d_stdiobase (d_stdstdio.U):
2017 This variable conditionally defines USE_STDIO_BASE if this system
2018 has a FILE structure declaring a usable _base field (or equivalent)
2019 in stdio.h.
2020
2021d_stdstdio (d_stdstdio.U):
2022 This variable conditionally defines USE_STDIO_PTR if this system
2023 has a FILE structure declaring usable _ptr and _cnt fields (or
2024 equivalent) in stdio.h.
2025
781b178c
JH
2026d_strchr (d_strchr.U):
2027 This variable conditionally defines HAS_STRCHR if strchr() and
2028 strrchr() are available for string searching.
2029
2030d_strcoll (d_strcoll.U):
2031 This variable conditionally defines HAS_STRCOLL if strcoll() is
2032 available to compare strings using collating information.
2033
2034d_strctcpy (d_strctcpy.U):
2035 This variable conditionally defines the USE_STRUCT_COPY symbol, which
2036 indicates to the C program that this C compiler knows how to copy
2037 structures.
2038
2039d_strerrm (d_strerror.U):
2040 This variable holds what Strerrr is defined as to translate an error
2041 code condition into an error message string. It could be 'strerror'
2042 or a more complex macro emulating strrror with sys_errlist[], or the
2043 "unknown" string when both strerror and sys_errlist are missing.
2044
2045d_strerror (d_strerror.U):
2046 This variable conditionally defines HAS_STRERROR if strerror() is
2047 available to translate error numbers to strings.
2048
10bc17b6
JH
2049d_strerror_r (d_strerror_r.U):
2050 This variable conditionally defines the HAS_STRERROR_R symbol,
2051 which indicates to the C program that the strerror_r()
2052 routine is available.
2053
b3c85772
JH
2054d_strftime (d_strftime.U):
2055 This variable conditionally defines the HAS_STRFTIME symbol, which
2056 indicates to the C program that the strftime() routine is available.
2057
fd550ca5
MB
2058d_strlcat (d_strlcat.U):
2059 This variable conditionally defines the HAS_STRLCAT symbol, which
2060 indicates to the C program that the strlcat () routine is available.
2061
2062d_strlcpy (d_strlcpy.U):
2063 This variable conditionally defines the HAS_STRLCPY symbol, which
2064 indicates to the C program that the strlcpy () routine is available.
2065
781b178c
JH
2066d_strtod (d_strtod.U):
2067 This variable conditionally defines the HAS_STRTOD symbol, which
2068 indicates to the C program that the strtod() routine is available
2069 to provide better numeric string conversion than atof().
2070
2071d_strtol (d_strtol.U):
2072 This variable conditionally defines the HAS_STRTOL symbol, which
2073 indicates to the C program that the strtol() routine is available
2074 to provide better numeric string conversion than atoi() and friends.
2075
ff935051
JH
2076d_strtold (d_strtold.U):
2077 This variable conditionally defines the HAS_STRTOLD symbol, which
2078 indicates to the C program that the strtold() routine is available.
2079
76d49b1c
JH
2080d_strtoll (d_strtoll.U):
2081 This variable conditionally defines the HAS_STRTOLL symbol, which
2082 indicates to the C program that the strtoll() routine is available.
2083
d0e6d399
NC
2084d_strtoq (d_strtoq.U):
2085 This variable conditionally defines the HAS_STRTOQ symbol, which
2086 indicates to the C program that the strtoq() routine is available.
2087
781b178c
JH
2088d_strtoul (d_strtoul.U):
2089 This variable conditionally defines the HAS_STRTOUL symbol, which
2090 indicates to the C program that the strtoul() routine is available
2091 to provide conversion of strings to unsigned long.
2092
ff935051 2093d_strtoull (d_strtoull.U):
11dc3f68
JH
2094 This variable conditionally defines the HAS_STRTOULL symbol, which
2095 indicates to the C program that the strtoull() routine is available.
2096
ff935051
JH
2097d_strtouq (d_strtouq.U):
2098 This variable conditionally defines the HAS_STRTOUQ symbol, which
2099 indicates to the C program that the strtouq() routine is available.
2100
781b178c
JH
2101d_strxfrm (d_strxfrm.U):
2102 This variable conditionally defines HAS_STRXFRM if strxfrm() is
2103 available to transform strings.
2104
2105d_suidsafe (d_dosuid.U):
2106 This variable conditionally defines SETUID_SCRIPTS_ARE_SECURE_NOW
2107 if setuid scripts can be secure. This test looks in /dev/fd/.
2108
2109d_symlink (d_symlink.U):
2110 This variable conditionally defines the HAS_SYMLINK symbol, which
2111 indicates to the C program that the symlink() routine is available
2112 to create symbolic links.
2113
2114d_syscall (d_syscall.U):
2115 This variable conditionally defines HAS_SYSCALL if syscall() is
2116 available call arbitrary system calls.
2117
5af95cda
JH
2118d_syscallproto (d_syscallproto.U):
2119 This variable conditionally defines the HAS_SYSCALL_PROTO symbol,
2120 which indicates to the C program that the system provides
2121 a prototype for the syscall() function. Otherwise, it is
2122 up to the program to supply one.
2123
781b178c
JH
2124d_sysconf (d_sysconf.U):
2125 This variable conditionally defines the HAS_SYSCONF symbol, which
2126 indicates to the C program that the sysconf() routine is available
2127 to determine system related limits and options.
2128
2129d_sysernlst (d_strerror.U):
2130 This variable conditionally defines HAS_SYS_ERRNOLIST if sys_errnolist[]
2131 is available to translate error numbers to the symbolic name.
2132
2133d_syserrlst (d_strerror.U):
2134 This variable conditionally defines HAS_SYS_ERRLIST if sys_errlist[] is
2135 available to translate error numbers to strings.
2136
2137d_system (d_system.U):
2138 This variable conditionally defines HAS_SYSTEM if system() is
2139 available to issue a shell command.
2140
2141d_tcgetpgrp (d_tcgtpgrp.U):
2142 This variable conditionally defines the HAS_TCGETPGRP symbol, which
2143 indicates to the C program that the tcgetpgrp() routine is available.
2144 to get foreground process group ID.
2145
2146d_tcsetpgrp (d_tcstpgrp.U):
2147 This variable conditionally defines the HAS_TCSETPGRP symbol, which
2148 indicates to the C program that the tcsetpgrp() routine is available
2149 to set foreground process group ID.
2150
781b178c
JH
2151d_telldir (d_readdir.U):
2152 This variable conditionally defines HAS_TELLDIR if telldir() is
2153 available.
2154
2155d_telldirproto (d_telldirproto.U):
2156 This variable conditionally defines the HAS_TELLDIR_PROTO symbol,
2157 which indicates to the C program that the system provides
2158 a prototype for the telldir() function. Otherwise, it is
2159 up to the program to supply one.
2160
2161d_time (d_time.U):
2162 This variable conditionally defines the HAS_TIME symbol, which indicates
2163 that the time() routine exists. The time() routine is normaly
2164 provided on UNIX systems.
2165
2166d_times (d_times.U):
2167 This variable conditionally defines the HAS_TIMES symbol, which indicates
2168 that the times() routine exists. The times() routine is normaly
2169 provided on UNIX systems. You may have to include <sys/times.h>.
2170
511116db
JH
2171d_tm_tm_gmtoff (i_time.U):
2172 This variable conditionally defines HAS_TM_TM_GMTOFF, which indicates
2173 indicates to the C program that the struct tm has the tm_gmtoff field.
2174
2175d_tm_tm_zone (i_time.U):
2176 This variable conditionally defines HAS_TM_TM_ZONE, which indicates
2177 indicates to the C program that the struct tm has the tm_zone field.
2178
10bc17b6
JH
2179d_tmpnam_r (d_tmpnam_r.U):
2180 This variable conditionally defines the HAS_TMPNAM_R symbol,
2181 which indicates to the C program that the tmpnam_r()
2182 routine is available.
2183
781b178c
JH
2184d_truncate (d_truncate.U):
2185 This variable conditionally defines HAS_TRUNCATE if truncate() is
2186 available to truncate files.
2187
10bc17b6
JH
2188d_ttyname_r (d_ttyname_r.U):
2189 This variable conditionally defines the HAS_TTYNAME_R symbol,
2190 which indicates to the C program that the ttyname_r()
2191 routine is available.
2192
781b178c
JH
2193d_tzname (d_tzname.U):
2194 This variable conditionally defines HAS_TZNAME if tzname[] is
2195 available to access timezone names.
2196
4e0554ec
JH
2197d_u32align (d_u32align.U):
2198 This variable tells whether you must access character data
2199 through U32-aligned pointers.
2200
2201d_ualarm (d_ualarm.U):
2202 This variable conditionally defines the HAS_UALARM symbol, which
2203 indicates to the C program that the ualarm() routine is available.
2204
781b178c
JH
2205d_umask (d_umask.U):
2206 This variable conditionally defines the HAS_UMASK symbol, which
2207 indicates to the C program that the umask() routine is available.
2208 to set and get the value of the file creation mask.
2209
2210d_uname (d_gethname.U):
2211 This variable conditionally defines the HAS_UNAME symbol, which
2212 indicates to the C program that the uname() routine may be
2213 used to derive the host name.
2214
2215d_union_semun (d_union_semun.U):
2216 This variable conditionally defines HAS_UNION_SEMUN if the
2217 union semun is defined by including <sys/sem.h>.
2218
758a5d79
JH
2219d_unordered (d_unordered.U):
2220 This variable conditionally defines the HAS_UNORDERED symbol, which
2221 indicates to the C program that the unordered() routine is available.
2222
bdf33aa7
SP
2223d_unsetenv (d_unsetenv.U):
2224 This variable conditionally defines the HAS_UNSETENV symbol, which
2225 indicates to the C program that the unsetenv () routine is available.
2226
4e0554ec
JH
2227d_usleep (d_usleep.U):
2228 This variable conditionally defines HAS_USLEEP if usleep() is
2229 available to do high granularity sleeps.
2230
5af95cda
JH
2231d_usleepproto (d_usleepproto.U):
2232 This variable conditionally defines the HAS_USLEEP_PROTO symbol,
2233 which indicates to the C program that the system provides
2234 a prototype for the usleep() function. Otherwise, it is
2235 up to the program to supply one.
2236
0545a864
JH
2237d_ustat (d_ustat.U):
2238 This variable conditionally defines HAS_USTAT if ustat() is
2239 available to query file system statistics by dev_t.
2240
526fdc24
MS
2241d_vendorarch (vendorarch.U):
2242 This variable conditionally defined PERL_VENDORARCH.
2243
0617aed7
JH
2244d_vendorbin (vendorbin.U):
2245 This variable conditionally defines PERL_VENDORBIN.
2246
a3635516
JH
2247d_vendorlib (vendorlib.U):
2248 This variable conditionally defines PERL_VENDORLIB.
2249
10305dfa
JH
2250d_vendorscript (vendorscript.U):
2251 This variable conditionally defines PERL_VENDORSCRIPT.
2252
781b178c
JH
2253d_vfork (d_vfork.U):
2254 This variable conditionally defines the HAS_VFORK symbol, which
2255 indicates the vfork() routine is available.
2256
2257d_void_closedir (d_closedir.U):
2258 This variable conditionally defines VOID_CLOSEDIR if closedir()
2259 does not return a value.
2260
2261d_voidsig (d_voidsig.U):
2262 This variable conditionally defines VOIDSIG if this system
2263 declares "void (*signal(...))()" in signal.h. The old way was to
2264 declare it as "int (*signal(...))()".
2265
2266d_voidtty (i_sysioctl.U):
2267 This variable conditionally defines USE_IOCNOTTY to indicate that the
2268 ioctl() call with TIOCNOTTY should be used to void tty association.
2269 Otherwise (on USG probably), it is enough to close the standard file
2270 decriptors and do a setpgrp().
2271
2272d_volatile (d_volatile.U):
2273 This variable conditionally defines the HASVOLATILE symbol, which
2274 indicates to the C program that this C compiler knows about the
2275 volatile declaration.
2276
2277d_vprintf (d_vprintf.U):
2278 This variable conditionally defines the HAS_VPRINTF symbol, which
2279 indicates to the C program that the vprintf() routine is available
2280 to printf with a pointer to an argument list.
2281
2282d_wait4 (d_wait4.U):
2283 This variable conditionally defines the HAS_WAIT4 symbol, which
2284 indicates the wait4() routine is available.
2285
2286d_waitpid (d_waitpid.U):
2287 This variable conditionally defines HAS_WAITPID if waitpid() is
2288 available to wait for child process.
2289
2290d_wcstombs (d_wcstombs.U):
2291 This variable conditionally defines the HAS_WCSTOMBS symbol, which
2292 indicates to the C program that the wcstombs() routine is available
2293 to convert wide character strings to multibyte strings.
2294
2295d_wctomb (d_wctomb.U):
2296 This variable conditionally defines the HAS_WCTOMB symbol, which
2297 indicates to the C program that the wctomb() routine is available
2298 to convert a wide character to a multibyte.
2299
4e0554ec
JH
2300d_writev (d_writev.U):
2301 This variable conditionally defines the HAS_WRITEV symbol, which
2302 indicates to the C program that the writev() routine is available.
2303
781b178c
JH
2304d_xenix (Guess.U):
2305 This variable conditionally defines the symbol XENIX, which alerts
2306 the C program that it runs under Xenix.
2307
2308date (Loc.U):
5bf26616 2309 This variable is used internally by Configure to determine the
781b178c
JH
2310 full pathname (if any) of the date program. After Configure runs,
2311 the value is reset to a plain "date" and is not useful.
2312
2313db_hashtype (i_db.U):
2314 This variable contains the type of the hash structure element
2315 in the <db.h> header file. In older versions of DB, it was
2316 int, while in newer ones it is u_int32_t.
2317
2318db_prefixtype (i_db.U):
2319 This variable contains the type of the prefix structure element
2320 in the <db.h> header file. In older versions of DB, it was
2321 int, while in newer ones it is size_t.
2322
640374d0
JH
2323db_version_major (i_db.U):
2324 This variable contains the major version number of
2325 Berkeley DB found in the <db.h> header file.
2326
2327db_version_minor (i_db.U):
2328 This variable contains the minor version number of
2329 Berkeley DB found in the <db.h> header file.
2330 For DB version 1 this is always 0.
2331
2332db_version_patch (i_db.U):
2333 This variable contains the patch version number of
2334 Berkeley DB found in the <db.h> header file.
2335 For DB version 1 this is always 0.
2336
781b178c
JH
2337defvoidused (voidflags.U):
2338 This variable contains the default value of the VOIDUSED symbol (15).
2339
2340direntrytype (i_dirent.U):
2341 This symbol is set to 'struct direct' or 'struct dirent' depending on
2342 whether dirent is available or not. You should use this pseudo type to
2343 portably declare your directory entries.
2344
2345dlext (dlext.U):
2346 This variable contains the extension that is to be used for the
2347 dynamically loaded modules that perl generaties.
2348
2349dlsrc (dlsrc.U):
2350 This variable contains the name of the dynamic loading file that
2351 will be used with the package.
2352
2353doublesize (doublesize.U):
2354 This variable contains the value of the DOUBLESIZE symbol, which
2355 indicates to the C program how many bytes there are in a double.
2356
2357drand01 (randfunc.U):
2358 Indicates the macro to be used to generate normalized
2359 random numbers. Uses randfunc, often divided by
2360 (double) (((unsigned long) 1 << randbits)) in order to
2361 normalize the result.
2362 In C programs, the macro 'Drand01' is mapped to drand01.
2363
10bc17b6
JH
2364drand48_r_proto (d_drand48_r.U):
2365 This variable encodes the prototype of drand48_r.
39183afa
JH
2366 It is zero if d_drand48_r is undef, and one of the
2367 REENTRANT_PROTO_T_ABC macros of reentr.h if d_drand48_r
2368 is defined.
10bc17b6 2369
781b178c
JH
2370dynamic_ext (Extensions.U):
2371 This variable holds a list of XS extension files we want to
2372 link dynamically into the package. It is used by Makefile.
2373
2374eagain (nblock_io.U):
2375 This variable bears the symbolic errno code set by read() when no
2376 data is present on the file and non-blocking I/O was enabled (otherwise,
2377 read() blocks naturally).
2378
2379ebcdic (ebcdic.U):
2380 This variable conditionally defines EBCDIC if this
2381 system uses EBCDIC encoding. Among other things, this
2382 means that the character ranges are not contiguous.
2383 See trnl.U
2384
2385echo (Loc.U):
5bf26616 2386 This variable is used internally by Configure to determine the
781b178c
JH
2387 full pathname (if any) of the echo program. After Configure runs,
2388 the value is reset to a plain "echo" and is not useful.
2389
2390egrep (Loc.U):
5bf26616 2391 This variable is used internally by Configure to determine the
781b178c
JH
2392 full pathname (if any) of the egrep program. After Configure runs,
2393 the value is reset to a plain "egrep" and is not useful.
2394
2395emacs (Loc.U):
2396 This variable is defined but not used by Configure.
2397 The value is a plain '' and is not useful.
2398
10bc17b6
JH
2399endgrent_r_proto (d_endgrent_r.U):
2400 This variable encodes the prototype of endgrent_r.
39183afa
JH
2401 It is zero if d_endgrent_r is undef, and one of the
2402 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endgrent_r
2403 is defined.
10bc17b6
JH
2404
2405endhostent_r_proto (d_endhostent_r.U):
2406 This variable encodes the prototype of endhostent_r.
39183afa
JH
2407 It is zero if d_endhostent_r is undef, and one of the
2408 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endhostent_r
2409 is defined.
10bc17b6
JH
2410
2411endnetent_r_proto (d_endnetent_r.U):
2412 This variable encodes the prototype of endnetent_r.
39183afa
JH
2413 It is zero if d_endnetent_r is undef, and one of the
2414 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endnetent_r
2415 is defined.
10bc17b6
JH
2416
2417endprotoent_r_proto (d_endprotoent_r.U):
2418 This variable encodes the prototype of endprotoent_r.
39183afa
JH
2419 It is zero if d_endprotoent_r is undef, and one of the
2420 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endprotoent_r
2421 is defined.
10bc17b6
JH
2422
2423endpwent_r_proto (d_endpwent_r.U):
2424 This variable encodes the prototype of endpwent_r.
39183afa
JH
2425 It is zero if d_endpwent_r is undef, and one of the
2426 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endpwent_r
2427 is defined.
10bc17b6
JH
2428
2429endservent_r_proto (d_endservent_r.U):
2430 This variable encodes the prototype of endservent_r.
39183afa
JH
2431 It is zero if d_endservent_r is undef, and one of the
2432 REENTRANT_PROTO_T_ABC macros of reentr.h if d_endservent_r
2433 is defined.
10bc17b6 2434
781b178c
JH
2435eunicefix (Init.U):
2436 When running under Eunice this variable contains a command which will
2437 convert a shell script to the proper form of text file for it to be
2438 executable by the shell. On other systems it is a no-op.
2439
2440exe_ext (Unix.U):
2441 This is an old synonym for _exe.
2442
2443expr (Loc.U):
5bf26616 2444 This variable is used internally by Configure to determine the
781b178c
JH
2445 full pathname (if any) of the expr program. After Configure runs,
2446 the value is reset to a plain "expr" and is not useful.
2447
2448extensions (Extensions.U):
2449 This variable holds a list of all extension files (both XS and
2450 non-xs linked into the package. It is propagated to Config.pm
635aebb7 2451 and is typically used to test whether a particular extesion
781b178c
JH
2452 is available.
2453
cb7ddd31
JH
2454extras (Extras.U):
2455 This variable holds a list of extra modules to install.
2456
781b178c
JH
2457fflushall (fflushall.U):
2458 This symbol, if defined, tells that to flush
2459 all pending stdio output one must loop through all
2460 the stdio file handles stored in an array and fflush them.
2461 Note that if fflushNULL is defined, fflushall will not
2462 even be probed for and will be left undefined.
2463
4d54317a
JH
2464fflushNULL (fflushall.U):
2465 This symbol, if defined, tells that fflush(NULL) does flush
2466 all pending stdio output.
2467
781b178c 2468find (Loc.U):
ff935051
JH
2469 This variable is defined but not used by Configure.
2470 The value is a plain '' and is not useful.
781b178c
JH
2471
2472firstmakefile (Unix.U):
2473 This variable defines the first file searched by make. On unix,
2474 it is makefile (then Makefile). On case-insensitive systems,
2475 it might be something else. This is only used to deal with
2476 convoluted make depend tricks.
2477
2478flex (Loc.U):
2479 This variable is defined but not used by Configure.
2480 The value is a plain '' and is not useful.
2481
a22e52b9
JH
2482fpossize (fpossize.U):
2483 This variable contains the size of a fpostype in bytes.
2484
781b178c 2485fpostype (fpostype.U):
635aebb7 2486 This variable defines Fpos_t to be something like fpos_t, long,
781b178c
JH
2487 uint, or whatever type is used to declare file positions in libc.
2488
2489freetype (mallocsrc.U):
2490 This variable contains the return type of free(). It is usually
2491 void, but occasionally int.
2492
5440bc8e
JH
2493from (Cross.U):
2494 This variable contains the command used by Configure
2495 to copy files from the target host. Useful and available
2496 only during Perl build.
2497 The string ':' if not cross-compiling.
2498
781b178c
JH
2499full_ar (Loc_ar.U):
2500 This variable contains the full pathname to 'ar', whether or
2501 not the user has specified 'portability'. This is only used
2502 in the Makefile.SH.
2503
2504full_csh (d_csh.U):
2505 This variable contains the full pathname to 'csh', whether or
2506 not the user has specified 'portability'. This is only used
2507 in the compiled C program, and we assume that all systems which
2508 can share this executable will have the same full pathname to
2509 'csh.'
2510
2511full_sed (Loc_sed.U):
2512 This variable contains the full pathname to 'sed', whether or
2513 not the user has specified 'portability'. This is only used
2514 in the compiled C program, and we assume that all systems which
2515 can share this executable will have the same full pathname to
2516 'sed.'
2517
123f32c0
MB
2518gccansipedantic (gccvers.U):
2519 If GNU cc (gcc) is used, this variable will enable (if set) the
2520 -ansi and -pedantic ccflags for building core files (through
2521 cflags script). (See Porting/pumpkin.pod for full description).
2522
af960fef 2523gccosandvers (gccvers.U):
123f32c0
MB
2524 If GNU cc (gcc) is used, this variable holds the operating system
2525 and version used to compile gcc. It is set to '' if not gcc,
af960fef
JH
2526 or if nothing useful can be parsed as the os version.
2527
2528gccversion (gccvers.U):
123f32c0 2529 If GNU cc (gcc) is used, this variable holds '1' or '2' to
781b178c
JH
2530 indicate whether the compiler is version 1 or 2. This is used in
2531 setting some of the default cflags. It is set to '' if not gcc.
2532
10bc17b6
JH
2533getgrent_r_proto (d_getgrent_r.U):
2534 This variable encodes the prototype of getgrent_r.
39183afa
JH
2535 It is zero if d_getgrent_r is undef, and one of the
2536 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrent_r
2537 is defined.
10bc17b6
JH
2538
2539getgrgid_r_proto (d_getgrgid_r.U):
2540 This variable encodes the prototype of getgrgid_r.
39183afa
JH
2541 It is zero if d_getgrgid_r is undef, and one of the
2542 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrgid_r
2543 is defined.
10bc17b6
JH
2544
2545getgrnam_r_proto (d_getgrnam_r.U):
2546 This variable encodes the prototype of getgrnam_r.
39183afa
JH
2547 It is zero if d_getgrnam_r is undef, and one of the
2548 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getgrnam_r
2549 is defined.
10bc17b6
JH
2550
2551gethostbyaddr_r_proto (d_gethostbyaddr_r.U):
2552 This variable encodes the prototype of gethostbyaddr_r.
39183afa
JH
2553 It is zero if d_gethostbyaddr_r is undef, and one of the
2554 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyaddr_r
2555 is defined.
10bc17b6
JH
2556
2557gethostbyname_r_proto (d_gethostbyname_r.U):
2558 This variable encodes the prototype of gethostbyname_r.
39183afa
JH
2559 It is zero if d_gethostbyname_r is undef, and one of the
2560 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostbyname_r
2561 is defined.
10bc17b6
JH
2562
2563gethostent_r_proto (d_gethostent_r.U):
2564 This variable encodes the prototype of gethostent_r.
39183afa
JH
2565 It is zero if d_gethostent_r is undef, and one of the
2566 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gethostent_r
2567 is defined.
10bc17b6
JH
2568
2569getlogin_r_proto (d_getlogin_r.U):
2570 This variable encodes the prototype of getlogin_r.
39183afa
JH
2571 It is zero if d_getlogin_r is undef, and one of the
2572 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getlogin_r
2573 is defined.
10bc17b6
JH
2574
2575getnetbyaddr_r_proto (d_getnetbyaddr_r.U):
2576 This variable encodes the prototype of getnetbyaddr_r.
39183afa
JH
2577 It is zero if d_getnetbyaddr_r is undef, and one of the
2578 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyaddr_r
2579 is defined.
10bc17b6
JH
2580
2581getnetbyname_r_proto (d_getnetbyname_r.U):
2582 This variable encodes the prototype of getnetbyname_r.
39183afa
JH
2583 It is zero if d_getnetbyname_r is undef, and one of the
2584 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetbyname_r
2585 is defined.
10bc17b6
JH
2586
2587getnetent_r_proto (d_getnetent_r.U):
2588 This variable encodes the prototype of getnetent_r.
39183afa
JH
2589 It is zero if d_getnetent_r is undef, and one of the
2590 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getnetent_r
2591 is defined.
10bc17b6
JH
2592
2593getprotobyname_r_proto (d_getprotobyname_r.U):
2594 This variable encodes the prototype of getprotobyname_r.
39183afa
JH
2595 It is zero if d_getprotobyname_r is undef, and one of the
2596 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobyname_r
2597 is defined.
10bc17b6
JH
2598
2599getprotobynumber_r_proto (d_getprotobynumber_r.U):
2600 This variable encodes the prototype of getprotobynumber_r.
39183afa
JH
2601 It is zero if d_getprotobynumber_r is undef, and one of the
2602 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotobynumber_r
2603 is defined.
10bc17b6
JH
2604
2605getprotoent_r_proto (d_getprotoent_r.U):
2606 This variable encodes the prototype of getprotoent_r.
39183afa
JH
2607 It is zero if d_getprotoent_r is undef, and one of the
2608 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getprotoent_r
2609 is defined.
10bc17b6
JH
2610
2611getpwent_r_proto (d_getpwent_r.U):
2612 This variable encodes the prototype of getpwent_r.
39183afa
JH
2613 It is zero if d_getpwent_r is undef, and one of the
2614 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwent_r
2615 is defined.
10bc17b6
JH
2616
2617getpwnam_r_proto (d_getpwnam_r.U):
2618 This variable encodes the prototype of getpwnam_r.
39183afa
JH
2619 It is zero if d_getpwnam_r is undef, and one of the
2620 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwnam_r
2621 is defined.
10bc17b6
JH
2622
2623getpwuid_r_proto (d_getpwuid_r.U):
2624 This variable encodes the prototype of getpwuid_r.
39183afa
JH
2625 It is zero if d_getpwuid_r is undef, and one of the
2626 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getpwuid_r
2627 is defined.
10bc17b6
JH
2628
2629getservbyname_r_proto (d_getservbyname_r.U):
2630 This variable encodes the prototype of getservbyname_r.
39183afa
JH
2631 It is zero if d_getservbyname_r is undef, and one of the
2632 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyname_r
2633 is defined.
10bc17b6
JH
2634
2635getservbyport_r_proto (d_getservbyport_r.U):
2636 This variable encodes the prototype of getservbyport_r.
39183afa
JH
2637 It is zero if d_getservbyport_r is undef, and one of the
2638 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservbyport_r
2639 is defined.
10bc17b6
JH
2640
2641getservent_r_proto (d_getservent_r.U):
2642 This variable encodes the prototype of getservent_r.
39183afa
JH
2643 It is zero if d_getservent_r is undef, and one of the
2644 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getservent_r
2645 is defined.
10bc17b6
JH
2646
2647getspnam_r_proto (d_getspnam_r.U):
2648 This variable encodes the prototype of getspnam_r.
39183afa
JH
2649 It is zero if d_getspnam_r is undef, and one of the
2650 REENTRANT_PROTO_T_ABC macros of reentr.h if d_getspnam_r
2651 is defined.
10bc17b6 2652
a22e52b9
JH
2653gidformat (gidf.U):
2654 This variable contains the format string used for printing a Gid_t.
2655
785fb66b
JH
2656gidsign (gidsign.U):
2657 This variable contains the signedness of a gidtype.
2658 1 for unsigned, -1 for signed.
2659
2660gidsize (gidsize.U):
2661 This variable contains the size of a gidtype in bytes.
2662
781b178c
JH
2663gidtype (gidtype.U):
2664 This variable defines Gid_t to be something like gid_t, int,
2665 ushort, or whatever type is used to declare the return type
2666 of getgid(). Typically, it is the type of group ids in the kernel.
2667
2668glibpth (libpth.U):
2669 This variable holds the general path (space-separated) used to
2670 find libraries. It may contain directories that do not exist on
2671 this platform, libpth is the cleaned-up version.
2672
c68a00c0
JH
2673gmake (Loc.U):
2674 This variable is used internally by Configure to determine the
2675 full pathname (if any) of the gmake program. After Configure runs,
2676 the value is reset to a plain "gmake" and is not useful.
2677
10bc17b6
JH
2678gmtime_r_proto (d_gmtime_r.U):
2679 This variable encodes the prototype of gmtime_r.
39183afa
JH
2680 It is zero if d_gmtime_r is undef, and one of the
2681 REENTRANT_PROTO_T_ABC macros of reentr.h if d_gmtime_r
2682 is defined.
10bc17b6 2683
00fac743
JH
2684gnulibc_version (d_gnulibc.U):
2685 This variable contains the version number of the GNU C library.
2686 It is usually something like '2.2.5'. It is a plain '' if this
2687 is not the GNU C library, or if the version is unknown.
2688
781b178c 2689grep (Loc.U):
5bf26616 2690 This variable is used internally by Configure to determine the
781b178c
JH
2691 full pathname (if any) of the grep program. After Configure runs,
2692 the value is reset to a plain "grep" and is not useful.
2693
2694groupcat (nis.U):
2695 This variable contains a command that produces the text of the
2696 /etc/group file. This is normally "cat /etc/group", but can be
2697 "ypcat group" when NIS is used.
aaacdc8b
GS
2698 On some systems, such as os390, there may be no equivalent
2699 command, in which case this variable is unset.
781b178c
JH
2700
2701groupstype (groupstype.U):
635aebb7 2702 This variable defines Groups_t to be something like gid_t, int,
781b178c
JH
2703 ushort, or whatever type is used for the second argument to
2704 getgroups() and setgroups(). Usually, this is the same as
2705 gidtype (gid_t), but sometimes it isn't.
2706
2707gzip (Loc.U):
5bf26616 2708 This variable is used internally by Configure to determine the
781b178c
JH
2709 full pathname (if any) of the gzip program. After Configure runs,
2710 the value is reset to a plain "gzip" and is not useful.
2711
2712h_fcntl (h_fcntl.U):
2713 This is variable gets set in various places to tell i_fcntl that
2714 <fcntl.h> should be included.
2715
2716h_sysfile (h_sysfile.U):
2717 This is variable gets set in various places to tell i_sys_file that
2718 <sys/file.h> should be included.
2719
2720hint (Oldconfig.U):
2721 Gives the type of hints used for previous answers. May be one of
2722 "default", "recommended" or "previous".
2723
2724hostcat (nis.U):
2725 This variable contains a command that produces the text of the
2726 /etc/hosts file. This is normally "cat /etc/hosts", but can be
2727 "ypcat hosts" when NIS is used.
aaacdc8b
GS
2728 On some systems, such as os390, there may be no equivalent
2729 command, in which case this variable is unset.
781b178c 2730
10305dfa
JH
2731html1dir (html1dir.U):
2732 This variable contains the name of the directory in which html
2733 source pages are to be put. This directory is for pages
2734 that describe whole programs, not libraries or modules. It
2735 is intended to correspond roughly to section 1 of the Unix
2736 manuals.
2737
2738html1direxp (html1dir.U):
2739 This variable is the same as the html1dir variable, but is filename
2740 expanded at configuration time, for convenient use in makefiles.
2741
2742html3dir (html3dir.U):
2743 This variable contains the name of the directory in which html
2744 source pages are to be put. This directory is for pages
2745 that describe libraries or modules. It is intended to
2746 correspond roughly to section 3 of the Unix manuals.
2747
2748html3direxp (html3dir.U):
2749 This variable is the same as the html3dir variable, but is filename
2750 expanded at configuration time, for convenient use in makefiles.
2751
a22e52b9
JH
2752i16size (perlxv.U):
2753 This variable is the size of an I16 in bytes.
2754
2755i16type (perlxv.U):
2756 This variable contains the C type used for Perl's I16.
2757
2758i32size (perlxv.U):
2759 This variable is the size of an I32 in bytes.
2760
2761i32type (perlxv.U):
2762 This variable contains the C type used for Perl's I32.
2763
2764i64size (perlxv.U):
2765 This variable is the size of an I64 in bytes.
2766
2767i64type (perlxv.U):
2768 This variable contains the C type used for Perl's I64.
2769
2770i8size (perlxv.U):
2771 This variable is the size of an I8 in bytes.
2772
2773i8type (perlxv.U):
2774 This variable contains the C type used for Perl's I8.
2775
781b178c
JH
2776i_arpainet (i_arpainet.U):
2777 This variable conditionally defines the I_ARPA_INET symbol,
2778 and indicates whether a C program should include <arpa/inet.h>.
2779
2780i_bsdioctl (i_sysioctl.U):
2781 This variable conditionally defines the I_SYS_BSDIOCTL symbol, which
2782 indicates to the C program that <sys/bsdioctl.h> exists and should
2783 be included.
2784
10bc17b6
JH
2785i_crypt (i_crypt.U):
2786 This variable conditionally defines the I_CRYPT symbol, and indicates
2787 whether a C program should include <crypt.h>.
2788
781b178c
JH
2789i_db (i_db.U):
2790 This variable conditionally defines the I_DB symbol, and indicates
2791 whether a C program may include Berkeley's DB include file <db.h>.
2792
2793i_dbm (i_dbm.U):
2794 This variable conditionally defines the I_DBM symbol, which
2795 indicates to the C program that <dbm.h> exists and should
2796 be included.
2797
2798i_dirent (i_dirent.U):
2799 This variable conditionally defines I_DIRENT, which indicates
2800 to the C program that it should include <dirent.h>.
2801
2802i_dld (i_dld.U):
2803 This variable conditionally defines the I_DLD symbol, which
2804 indicates to the C program that <dld.h> (GNU dynamic loading)
2805 exists and should be included.
2806
2807i_dlfcn (i_dlfcn.U):
2808 This variable conditionally defines the I_DLFCN symbol, which
2809 indicates to the C program that <dlfcn.h> exists and should
2810 be included.
2811
2812i_fcntl (i_fcntl.U):
2813 This variable controls the value of I_FCNTL (which tells
2814 the C program to include <fcntl.h>).
2815
2816i_float (i_float.U):
2817 This variable conditionally defines the I_FLOAT symbol, and indicates
2818 whether a C program may include <float.h> to get symbols like DBL_MAX
2819 or DBL_MIN, i.e. machine dependent floating point values.
2820
758a5d79
JH
2821i_fp (i_fp.U):
2822 This variable conditionally defines the I_FP symbol, and indicates
2823 whether a C program should include <fp.h>.
2824
2825i_fp_class (i_fp_class.U):
2826 This variable conditionally defines the I_FP_CLASS symbol, and indicates
2827 whether a C program should include <fp_class.h>.
2828
781b178c
JH
2829i_gdbm (i_gdbm.U):
2830 This variable conditionally defines the I_GDBM symbol, which
2831 indicates to the C program that <gdbm.h> exists and should
2832 be included.
2833
2834i_grp (i_grp.U):
2835 This variable conditionally defines the I_GRP symbol, and indicates
2836 whether a C program should include <grp.h>.
2837
792d8dab
JH
2838i_ieeefp (i_ieeefp.U):
2839 This variable conditionally defines the I_IEEEFP symbol, and indicates
2840 whether a C program should include <ieeefp.h>.
2841
781b178c
JH
2842i_inttypes (i_inttypes.U):
2843 This variable conditionally defines the I_INTTYPES symbol,
2844 and indicates whether a C program should include <inttypes.h>.
2845
2765b840
JH
2846i_langinfo (i_langinfo.U):
2847 This variable conditionally defines the I_LANGINFO symbol,
2848 and indicates whether a C program should include <langinfo.h>.
2849
af960fef
JH
2850i_libutil (i_libutil.U):
2851 This variable conditionally defines the I_LIBUTIL symbol, and indicates
2852 whether a C program should include <libutil.h>.
2853
781b178c
JH
2854i_limits (i_limits.U):
2855 This variable conditionally defines the I_LIMITS symbol, and indicates
2856 whether a C program may include <limits.h> to get symbols like WORD_BIT
2857 and friends.
2858
2859i_locale (i_locale.U):
2860 This variable conditionally defines the I_LOCALE symbol,
2861 and indicates whether a C program should include <locale.h>.
2862
2863i_machcthr (i_machcthr.U):
2864 This variable conditionally defines the I_MACH_CTHREADS symbol,
2865 and indicates whether a C program should include <mach/cthreads.h>.
2866
2867i_malloc (i_malloc.U):
2868 This variable conditionally defines the I_MALLOC symbol, and indicates
2869 whether a C program should include <malloc.h>.
2870
2871i_math (i_math.U):
2872 This variable conditionally defines the I_MATH symbol, and indicates
2873 whether a C program may include <math.h>.
2874
2875i_memory (i_memory.U):
2876 This variable conditionally defines the I_MEMORY symbol, and indicates
2877 whether a C program should include <memory.h>.
2878
2879i_mntent (i_mntent.U):
2880 This variable conditionally defines the I_MNTENT symbol, and indicates
2881 whether a C program should include <mntent.h>.
2882
2883i_ndbm (i_ndbm.U):
2884 This variable conditionally defines the I_NDBM symbol, which
2885 indicates to the C program that <ndbm.h> exists and should
2886 be included.
2887
2888i_netdb (i_netdb.U):
2889 This variable conditionally defines the I_NETDB symbol, and indicates
2890 whether a C program should include <netdb.h>.
2891
2892i_neterrno (i_neterrno.U):
2893 This variable conditionally defines the I_NET_ERRNO symbol, which
2894 indicates to the C program that <net/errno.h> exists and should
2895 be included.
2896
2897i_netinettcp (i_netinettcp.U):
2898 This variable conditionally defines the I_NETINET_TCP symbol,
2899 and indicates whether a C program should include <netinet/tcp.h>.
2900
2901i_niin (i_niin.U):
2902 This variable conditionally defines I_NETINET_IN, which indicates
2903 to the C program that it should include <netinet/in.h>. Otherwise,
2904 you may try <sys/in.h>.
2905
2906i_poll (i_poll.U):
2907 This variable conditionally defines the I_POLL symbol, and indicates
2908 whether a C program should include <poll.h>.
2909
3813c136
JH
2910i_prot (i_prot.U):
2911 This variable conditionally defines the I_PROT symbol, and indicates
2912 whether a C program should include <prot.h>.
2913
781b178c 2914i_pthread (i_pthread.U):
190b66db 2915 This variable conditionally defines the I_PTHREAD symbol,
781b178c
JH
2916 and indicates whether a C program should include <pthread.h>.
2917
2918i_pwd (i_pwd.U):
2919 This variable conditionally defines I_PWD, which indicates
2920 to the C program that it should include <pwd.h>.
2921
2922i_rpcsvcdbm (i_dbm.U):
2923 This variable conditionally defines the I_RPCSVC_DBM symbol, which
2924 indicates to the C program that <rpcsvc/dbm.h> exists and should
2925 be included. Some System V systems might need this instead of <dbm.h>.
2926
2927i_sfio (i_sfio.U):
2928 This variable conditionally defines the I_SFIO symbol,
2929 and indicates whether a C program should include <sfio.h>.
2930
2931i_sgtty (i_termio.U):
2932 This variable conditionally defines the I_SGTTY symbol, which
2933 indicates to the C program that it should include <sgtty.h> rather
2934 than <termio.h>.
2935
2936i_shadow (i_shadow.U):
2937 This variable conditionally defines the I_SHADOW symbol, and indicates
2938 whether a C program should include <shadow.h>.
2939
2940i_socks (i_socks.U):
2941 This variable conditionally defines the I_SOCKS symbol, and indicates
2942 whether a C program should include <socks.h>.
2943
2944i_stdarg (i_varhdr.U):
2945 This variable conditionally defines the I_STDARG symbol, which
2946 indicates to the C program that <stdarg.h> exists and should
2947 be included.
2948
2949i_stddef (i_stddef.U):
2950 This variable conditionally defines the I_STDDEF symbol, which
2951 indicates to the C program that <stddef.h> exists and should
2952 be included.
2953
2954i_stdlib (i_stdlib.U):
2955 This variable conditionally defines the I_STDLIB symbol, which
2956 indicates to the C program that <stdlib.h> exists and should
2957 be included.
2958
2959i_string (i_string.U):
2960 This variable conditionally defines the I_STRING symbol, which
2961 indicates that <string.h> should be included rather than <strings.h>.
2962
792d8dab
JH
2963i_sunmath (i_sunmath.U):
2964 This variable conditionally defines the I_SUNMATH symbol, and indicates
2965 whether a C program should include <sunmath.h>.
2966
781b178c
JH
2967i_sysaccess (i_sysaccess.U):
2968 This variable conditionally defines the I_SYS_ACCESS symbol,
2969 and indicates whether a C program should include <sys/access.h>.
2970
2971i_sysdir (i_sysdir.U):
2972 This variable conditionally defines the I_SYS_DIR symbol, and indicates
2973 whether a C program should include <sys/dir.h>.
2974
2975i_sysfile (i_sysfile.U):
2976 This variable conditionally defines the I_SYS_FILE symbol, and indicates
2977 whether a C program should include <sys/file.h> to get R_OK and friends.
2978
2979i_sysfilio (i_sysioctl.U):
2980 This variable conditionally defines the I_SYS_FILIO symbol, which
2981 indicates to the C program that <sys/filio.h> exists and should
2982 be included in preference to <sys/ioctl.h>.
2983
2984i_sysin (i_niin.U):
2985 This variable conditionally defines I_SYS_IN, which indicates
2986 to the C program that it should include <sys/in.h> instead of
2987 <netinet/in.h>.
2988
2989i_sysioctl (i_sysioctl.U):
2990 This variable conditionally defines the I_SYS_IOCTL symbol, which
2991 indicates to the C program that <sys/ioctl.h> exists and should
2992 be included.
2993
ca52efda
JH
2994i_syslog (i_syslog.U):
2995 This variable conditionally defines the I_SYSLOG symbol,
2996 and indicates whether a C program should include <syslog.h>.
2997
fe749a9f
JH
2998i_sysmman (i_sysmman.U):
2999 This variable conditionally defines the I_SYS_MMAN symbol, and
3000 indicates whether a C program should include <sys/mman.h>.
3001
87b71857
JH
3002i_sysmode (i_sysmode.U):
3003 This variable conditionally defines the I_SYSMODE symbol,
3004 and indicates whether a C program should include <sys/mode.h>.
3005
781b178c
JH
3006i_sysmount (i_sysmount.U):
3007 This variable conditionally defines the I_SYSMOUNT symbol,
3008 and indicates whether a C program should include <sys/mount.h>.
3009
3010i_sysndir (i_sysndir.U):
3011 This variable conditionally defines the I_SYS_NDIR symbol, and indicates
3012 whether a C program should include <sys/ndir.h>.
3013
3014i_sysparam (i_sysparam.U):
3015 This variable conditionally defines the I_SYS_PARAM symbol, and indicates
3016 whether a C program should include <sys/param.h>.
3017
3018i_sysresrc (i_sysresrc.U):
3019 This variable conditionally defines the I_SYS_RESOURCE symbol,
3020 and indicates whether a C program should include <sys/resource.h>.
3021
3022i_syssecrt (i_syssecrt.U):
3023 This variable conditionally defines the I_SYS_SECURITY symbol,
3024 and indicates whether a C program should include <sys/security.h>.
3025
3026i_sysselct (i_sysselct.U):
3027 This variable conditionally defines I_SYS_SELECT, which indicates
3028 to the C program that it should include <sys/select.h> in order to
3029 get the definition of struct timeval.
3030
3031i_syssockio (i_sysioctl.U):
3032 This variable conditionally defines I_SYS_SOCKIO to indicate to the
3033 C program that socket ioctl codes may be found in <sys/sockio.h>
3034 instead of <sys/ioctl.h>.
3035
3036i_sysstat (i_sysstat.U):
3037 This variable conditionally defines the I_SYS_STAT symbol,
3038 and indicates whether a C program should include <sys/stat.h>.
3039
0545a864
JH
3040i_sysstatfs (i_sysstatfs.U):
3041 This variable conditionally defines the I_SYSSTATFS symbol,
3042 and indicates whether a C program should include <sys/statfs.h>.
3043
781b178c
JH
3044i_sysstatvfs (i_sysstatvfs.U):
3045 This variable conditionally defines the I_SYSSTATVFS symbol,
3046 and indicates whether a C program should include <sys/statvfs.h>.
3047
3048i_systime (i_time.U):
3049 This variable conditionally defines I_SYS_TIME, which indicates
3050 to the C program that it should include <sys/time.h>.
3051
3052i_systimek (i_time.U):
3053 This variable conditionally defines I_SYS_TIME_KERNEL, which
3054 indicates to the C program that it should include <sys/time.h>
3055 with KERNEL defined.
3056
3057i_systimes (i_systimes.U):
3058 This variable conditionally defines the I_SYS_TIMES symbol, and indicates
3059 whether a C program should include <sys/times.h>.
3060
3061i_systypes (i_systypes.U):
3062 This variable conditionally defines the I_SYS_TYPES symbol,
3063 and indicates whether a C program should include <sys/types.h>.
3064
3065i_sysuio (i_sysuio.U):
3066 This variable conditionally defines the I_SYSUIO symbol, and indicates
3067 whether a C program should include <sys/uio.h>.
3068
3069i_sysun (i_sysun.U):
3070 This variable conditionally defines I_SYS_UN, which indicates
3071 to the C program that it should include <sys/un.h> to get UNIX
3072 domain socket definitions.
3073
d4935d7f
JH
3074i_sysutsname (i_sysutsname.U):
3075 This variable conditionally defines the I_SYSUTSNAME symbol,
3076 and indicates whether a C program should include <sys/utsname.h>.
3077
0545a864
JH
3078i_sysvfs (i_sysvfs.U):
3079 This variable conditionally defines the I_SYSVFS symbol,
3080 and indicates whether a C program should include <sys/vfs.h>.
3081
781b178c
JH
3082i_syswait (i_syswait.U):
3083 This variable conditionally defines I_SYS_WAIT, which indicates
3084 to the C program that it should include <sys/wait.h>.
3085
3086i_termio (i_termio.U):
3087 This variable conditionally defines the I_TERMIO symbol, which
3088 indicates to the C program that it should include <termio.h> rather
3089 than <sgtty.h>.
3090
3091i_termios (i_termio.U):
3092 This variable conditionally defines the I_TERMIOS symbol, which
3093 indicates to the C program that the POSIX <termios.h> file is
3094 to be included.
3095
3096i_time (i_time.U):
3097 This variable conditionally defines I_TIME, which indicates
3098 to the C program that it should include <time.h>.
3099
3100i_unistd (i_unistd.U):
3101 This variable conditionally defines the I_UNISTD symbol, and indicates
3102 whether a C program should include <unistd.h>.
3103
0545a864
JH
3104i_ustat (i_ustat.U):
3105 This variable conditionally defines the I_USTAT symbol, and indicates
3106 whether a C program should include <ustat.h>.
3107
781b178c
JH
3108i_utime (i_utime.U):
3109 This variable conditionally defines the I_UTIME symbol, and indicates
3110 whether a C program should include <utime.h>.
3111
3112i_values (i_values.U):
3113 This variable conditionally defines the I_VALUES symbol, and indicates
3114 whether a C program may include <values.h> to get symbols like MAXLONG
3115 and friends.
3116
3117i_varargs (i_varhdr.U):
3118 This variable conditionally defines I_VARARGS, which indicates
3119 to the C program that it should include <varargs.h>.
3120
3121i_varhdr (i_varhdr.U):
3122 Contains the name of the header to be included to get va_dcl definition.
3123 Typically one of varargs.h or stdarg.h.
3124
3125i_vfork (i_vfork.U):
3126 This variable conditionally defines the I_VFORK symbol, and indicates
3127 whether a C program should include vfork.h.
3128
3129ignore_versioned_solibs (libs.U):
3130 This variable should be non-empty if non-versioned shared
3131 libraries (libfoo.so.x.y) are to be ignored (because they
3132 cannot be linked against).
3133
ff935051
JH
3134inc_version_list (inc_version_list.U):
3135 This variable specifies the list of subdirectories in over
3136 which perl.c:incpush() and lib/lib.pm will automatically
3a096bf3
JH
3137 search when adding directories to @INC. The elements in
3138 the list are separated by spaces. This is only useful
ff935051
JH
3139 if you have a perl library directory tree structured like the
3140 default one. See INSTALL for how this works. The versioned
3141 site_perl directory was introduced in 5.005, so that is the
3142 lowest possible value.
3143
3a096bf3
JH
3144inc_version_list_init (inc_version_list.U):
3145 This variable holds the same list as inc_version_list, but
635aebb7 3146 each item is enclosed in double quotes and separated by commas,
3a096bf3
JH
3147 suitable for use in the PERL_INC_VERSION_LIST initialization.
3148
781b178c 3149incpath (usrinc.U):
209e5c0a
JH
3150 This variable must preceed the normal include path to get hte
3151 right one, as in "$incpath/usr/include" or "$incpath/usr/lib".
781b178c
JH
3152 Value can be "" or "/bsd43" on mips.
3153
3154inews (Loc.U):
3155 This variable is defined but not used by Configure.
3156 The value is a plain '' and is not useful.
3157
3158installarchlib (archlib.U):
3159 This variable is really the same as archlibexp but may differ on
3160 those systems using AFS. For extra portability, only this variable
3161 should be used in makefiles.
3162
3163installbin (bin.U):
3164 This variable is the same as binexp unless AFS is running in which case
3165 the user is explicitely prompted for it. This variable should always
3166 be used in your makefiles for maximum portability.
3167
10305dfa 3168installhtml1dir (html1dir.U):
635aebb7
AL
3169 This variable is really the same as html1direxp, unless you are
3170 using a different installprefix. For extra portability, you
10305dfa
JH
3171 should only use this variable within your makefiles.
3172
3173installhtml3dir (html3dir.U):
635aebb7
AL
3174 This variable is really the same as html3direxp, unless you are
3175 using a different installprefix. For extra portability, you
10305dfa
JH
3176 should only use this variable within your makefiles.
3177
781b178c
JH
3178installman1dir (man1dir.U):
3179 This variable is really the same as man1direxp, unless you are using
3180 AFS in which case it points to the read/write location whereas
3181 man1direxp only points to the read-only access location. For extra
3182 portability, you should only use this variable within your makefiles.
3183
3184installman3dir (man3dir.U):
3185 This variable is really the same as man3direxp, unless you are using
3186 AFS in which case it points to the read/write location whereas
3187 man3direxp only points to the read-only access location. For extra
3188 portability, you should only use this variable within your makefiles.
3189
3190installprefix (installprefix.U):
635aebb7 3191 This variable holds the name of the directory below which
781b178c
JH
3192 "make install" will install the package. For most users, this
3193 is the same as prefix. However, it is useful for
3194 installing the software into a different (usually temporary)
3195 location after which it can be bundled up and moved somehow
3196 to the final location specified by prefix.
3197
3198installprefixexp (installprefix.U):
3199 This variable holds the full absolute path of installprefix
3200 with all ~-expansion done.
3201
3202installprivlib (privlib.U):
3203 This variable is really the same as privlibexp but may differ on
3204 those systems using AFS. For extra portability, only this variable
3205 should be used in makefiles.
3206
3207installscript (scriptdir.U):
3208 This variable is usually the same as scriptdirexp, unless you are on
3209 a system running AFS, in which case they may differ slightly. You
3210 should always use this variable within your makefiles for portability.
3211
3212installsitearch (sitearch.U):
3213 This variable is really the same as sitearchexp but may differ on
3214 those systems using AFS. For extra portability, only this variable
3215 should be used in makefiles.
3216
0617aed7
JH
3217installsitebin (sitebin.U):
3218 This variable is usually the same as sitebinexp, unless you are on
3219 a system running AFS, in which case they may differ slightly. You
3220 should always use this variable within your makefiles for portability.
3221
e755722e
JH
3222installsitehtml1dir (sitehtml1dir.U):
3223 This variable is really the same as sitehtml1direxp, unless you are using
10305dfa
JH
3224 AFS in which case it points to the read/write location whereas
3225 html1direxp only points to the read-only access location. For extra
3226 portability, you should only use this variable within your makefiles.
3227
e755722e
JH
3228installsitehtml3dir (sitehtml3dir.U):
3229 This variable is really the same as sitehtml3direxp, unless you are using
10305dfa
JH
3230 AFS in which case it points to the read/write location whereas
3231 html3direxp only points to the read-only access location. For extra
3232 portability, you should only use this variable within your makefiles.
3233
781b178c
JH
3234installsitelib (sitelib.U):
3235 This variable is really the same as sitelibexp but may differ on
3236 those systems using AFS. For extra portability, only this variable
3237 should be used in makefiles.
3238
e755722e
JH
3239installsiteman1dir (siteman1dir.U):
3240 This variable is really the same as siteman1direxp, unless you are using
10305dfa
JH
3241 AFS in which case it points to the read/write location whereas
3242 man1direxp only points to the read-only access location. For extra
3243 portability, you should only use this variable within your makefiles.
3244
e755722e
JH
3245installsiteman3dir (siteman3dir.U):
3246 This variable is really the same as siteman3direxp, unless you are using
10305dfa
JH
3247 AFS in which case it points to the read/write location whereas
3248 man3direxp only points to the read-only access location. For extra
3249 portability, you should only use this variable within your makefiles.
3250
3251installsitescript (sitescript.U):
3252 This variable is usually the same as sitescriptexp, unless you are on
3253 a system running AFS, in which case they may differ slightly. You
3254 should always use this variable within your makefiles for portability.
3255
781b178c
JH
3256installstyle (installstyle.U):
3257 This variable describes the "style" of the perl installation.
3258 This is intended to be useful for tools that need to
3259 manipulate entire perl distributions. Perl itself doesn't use
3260 this to find its libraries -- the library directories are
3261 stored directly in Config.pm. Currently, there are only two
3262 styles: "lib" and "lib/perl5". The default library locations
3263 (e.g. privlib, sitelib) are either $prefix/lib or
3264 $prefix/lib/perl5. The former is useful if $prefix is a
3265 directory dedicated to perl (e.g. /opt/perl), while the latter
3266 is useful if $prefix is shared by many packages, e.g. if
3267 $prefix=/usr/local.
9c20e9bc 3268
123f32c0
MB
3269 Unfortunately, while this "style" variable is used to set
3270 defaults for all three directory hierarchies (core, vendor, and
3271 site), there is no guarantee that the same style is actually
3272 appropriate for all those directories. For example, $prefix
3273 might be /opt/perl, but $siteprefix might be /usr/local.
3274 (Perhaps, in retrospect, the "lib" style should never have been
3275 supported, but it did seem like a nice idea at the time.)
3276
3277 The situation is even less clear for tools such as MakeMaker
3278 that can be used to install additional modules into
3279 non-standard places. For example, if a user intends to install
3280 a module into a private directory (perhaps by setting PREFIX on
3281 the Makefile.PL command line), then there is no reason to
3282 assume that the Configure-time $installstyle setting will be
3283 relevant for that PREFIX.
3284
9c20e9bc 3285 This may later be extended to include other information, so
781b178c 3286 be careful with pattern-matching on the results.
9c20e9bc
JH
3287
3288 For compatibility with perl5.005 and earlier, the default
781b178c
JH
3289 setting is based on whether or not $prefix contains the string
3290 "perl".
3291
3292installusrbinperl (instubperl.U):
3293 This variable tells whether Perl should be installed also as
3294 /usr/bin/perl in addition to
3295 $installbin/perl
3296
526fdc24
MS
3297installvendorarch (vendorarch.U):
3298 This variable is really the same as vendorarchexp but may differ on
3299 those systems using AFS. For extra portability, only this variable
3300 should be used in makefiles.
3301
0617aed7
JH
3302installvendorbin (vendorbin.U):
3303 This variable is really the same as vendorbinexp but may differ on
3304 those systems using AFS. For extra portability, only this variable
3305 should be used in makefiles.
3306
e755722e
JH
3307installvendorhtml1dir (vendorhtml1dir.U):
3308 This variable is really the same as vendorhtml1direxp but may differ on
10305dfa
JH
3309 those systems using AFS. For extra portability, only this variable
3310 should be used in makefiles.
3311
e755722e
JH
3312installvendorhtml3dir (vendorhtml3dir.U):
3313 This variable is really the same as vendorhtml3direxp but may differ on
10305dfa
JH
3314 those systems using AFS. For extra portability, only this variable
3315 should be used in makefiles.
3316
a3635516
JH
3317installvendorlib (vendorlib.U):
3318 This variable is really the same as vendorlibexp but may differ on
3319 those systems using AFS. For extra portability, only this variable
3320 should be used in makefiles.
3321
e755722e
JH
3322installvendorman1dir (vendorman1dir.U):
3323 This variable is really the same as vendorman1direxp but may differ on
10305dfa
JH
3324 those systems using AFS. For extra portability, only this variable
3325 should be used in makefiles.
3326
e755722e
JH
3327installvendorman3dir (vendorman3dir.U):
3328 This variable is really the same as vendorman3direxp but may differ on
10305dfa
JH
3329 those systems using AFS. For extra portability, only this variable
3330 should be used in makefiles.
3331
3332installvendorscript (vendorscript.U):
3333 This variable is really the same as vendorscriptexp but may differ on
3334 those systems using AFS. For extra portability, only this variable
3335 should be used in makefiles.
3336
781b178c
JH
3337intsize (intsize.U):
3338 This variable contains the value of the INTSIZE symbol, which
3339 indicates to the C program how many bytes there are in an int.
3340
4b661809 3341issymlink (issymlink.U):
983dbef6
JH
3342 This variable holds the test command to test for a symbolic link
3343 (if they are supported). Typical values include 'test -h' and
3344 'test -L'.
4b661809 3345
a22e52b9
JH
3346ivdformat (perlxvf.U):
3347 This variable contains the format string used for printing
635aebb7 3348 a Perl IV as a signed decimal integer.
a22e52b9
JH
3349
3350ivsize (perlxv.U):
3351 This variable is the size of an IV in bytes.
3352
3353ivtype (perlxv.U):
3354 This variable contains the C type used for Perl's IV.
3355
781b178c 3356known_extensions (Extensions.U):
635aebb7 3357 This variable holds a list of all XS extensions included in
781b178c
JH
3358 the package.
3359
3360ksh (Loc.U):
3361 This variable is defined but not used by Configure.
3362 The value is a plain '' and is not useful.
3363
781b178c
JH
3364ld (dlsrc.U):
3365 This variable indicates the program to be used to link
3366 libraries for dynamic loading. On some systems, it is 'ld'.
3367 On ELF systems, it should be $cc. Mostly, we'll try to respect
3368 the hint file setting.
3369
3370lddlflags (dlsrc.U):
3371 This variable contains any special flags that might need to be
3372 passed to $ld to create a shared library suitable for dynamic
3373 loading. It is up to the makefile to use it. For hpux, it
3374 should be '-b'. For sunos 4.1, it is empty.
3375
3376ldflags (ccflags.U):
3377 This variable contains any additional C loader flags desired by
3378 the user. It is up to the Makefile to use this.
3379
af960fef
JH
3380ldflags_uselargefiles (uselfs.U):
3381 This variable contains the loader flags needed by large file builds
3382 and added to ldflags by hints files.
3383
781b178c
JH
3384ldlibpthname (libperl.U):
3385 This variable holds the name of the shared library
3386 search path, often LD_LIBRARY_PATH. To get an empty
3387 string, the hints file must set this to 'none'.
3388
3389less (Loc.U):
5bf26616 3390 This variable is used internally by Configure to determine the
781b178c
JH
3391 full pathname (if any) of the less program. After Configure runs,
3392 the value is reset to a plain "less" and is not useful.
3393
3394lib_ext (Unix.U):
3395 This is an old synonym for _a.
3396
3397libc (libc.U):
3398 This variable contains the location of the C library.
3399
3400libperl (libperl.U):
3401 The perl executable is obtained by linking perlmain.c with
3402 libperl, any static extensions (usually just DynaLoader),
3403 and any other libraries needed on this system. libperl
3404 is usually libperl.a, but can also be libperl.so.xxx if
3405 the user wishes to build a perl executable with a shared
3406 library.
3407
3408libpth (libpth.U):
3409 This variable holds the general path (space-separated) used to find
3410 libraries. It is intended to be used by other units.
3411
3412libs (libs.U):
3413 This variable holds the additional libraries we want to use.
9285ede2 3414 It is up to the Makefile to deal with it. The list can be empty.
781b178c 3415
fe749a9f
JH
3416libsdirs (libs.U):
3417 This variable holds the directory names aka dirnames of the libraries
3418 we found and accepted, duplicates are removed.
3419
3420libsfiles (libs.U):
3421 This variable holds the filenames aka basenames of the libraries
3422 we found and accepted.
3423
3424libsfound (libs.U):
3425 This variable holds the full pathnames of the libraries
3426 we found and accepted.
3427
13b3f787
JH
3428libspath (libs.U):
3429 This variable holds the directory names probed for libraries.
3430
781b178c
JH
3431libswanted (Myinit.U):
3432 This variable holds a list of all the libraries we want to
3433 search. The order is chosen to pick up the c library
3434 ahead of ucb or bsd libraries for SVR4.
3435
af960fef
JH
3436libswanted_uselargefiles (uselfs.U):
3437 This variable contains the libraries needed by large file builds
3438 and added to ldflags by hints files. It is a space separated list
3439 of the library names without the "lib" prefix or any suffix, just
209e5c0a 3440 like libswanted..
af960fef 3441
781b178c 3442line (Loc.U):
ff935051
JH
3443 This variable is defined but not used by Configure.
3444 The value is a plain '' and is not useful.
781b178c
JH
3445
3446lint (Loc.U):
3447 This variable is defined but not used by Configure.
3448 The value is a plain '' and is not useful.
3449
3450lkflags (ccflags.U):
3451 This variable contains any additional C partial linker flags desired by
3452 the user. It is up to the Makefile to use this.
3453
3454ln (Loc.U):
5bf26616 3455 This variable is used internally by Configure to determine the
781b178c
JH
3456 full pathname (if any) of the ln program. After Configure runs,
3457 the value is reset to a plain "ln" and is not useful.
3458
3459lns (lns.U):
635aebb7 3460 This variable holds the name of the command to make
781b178c
JH
3461 symbolic links (if they are supported). It can be used
3462 in the Makefile. It is either 'ln -s' or 'ln'
3463
10bc17b6
JH
3464localtime_r_proto (d_localtime_r.U):
3465 This variable encodes the prototype of localtime_r.
39183afa
JH
3466 It is zero if d_localtime_r is undef, and one of the
3467 REENTRANT_PROTO_T_ABC macros of reentr.h if d_localtime_r
3468 is defined.
10bc17b6 3469
781b178c
JH
3470locincpth (ccflags.U):
3471 This variable contains a list of additional directories to be
3472 searched by the compiler. The appropriate '-I' directives will
3473 be added to ccflags. This is intended to simplify setting
3474 local directories from the Configure command line.
3475 It's not much, but it parallels the loclibpth stuff in libpth.U.
3476
3477loclibpth (libpth.U):
3478 This variable holds the paths (space-separated) used to find local
3479 libraries. It is prepended to libpth, and is intended to be easily
3480 set from the command line.
3481
3482longdblsize (d_longdbl.U):
3483 This variable contains the value of the LONG_DOUBLESIZE symbol, which
3484 indicates to the C program how many bytes there are in a long double,
3485 if this system supports long doubles.
3486
3487longlongsize (d_longlong.U):
3488 This variable contains the value of the LONGLONGSIZE symbol, which
3489 indicates to the C program how many bytes there are in a long long,
3490 if this system supports long long.
3491
3492longsize (intsize.U):
3493 This variable contains the value of the LONGSIZE symbol, which
3494 indicates to the C program how many bytes there are in a long.
3495
3496lp (Loc.U):
3497 This variable is defined but not used by Configure.
3498 The value is a plain '' and is not useful.
3499
3500lpr (Loc.U):
3501 This variable is defined but not used by Configure.
3502 The value is a plain '' and is not useful.
3503
3504ls (Loc.U):
5bf26616 3505 This variable is used internally by Configure to determine the
781b178c
JH
3506 full pathname (if any) of the ls program. After Configure runs,
3507 the value is reset to a plain "ls" and is not useful.
3508
3509lseeksize (lseektype.U):
635aebb7 3510 This variable defines lseektype to be something like off_t, long,
781b178c
JH
3511 or whatever type is used to declare lseek offset's type in the
3512 kernel (which also appears to be lseek's return type).
3513
3514lseektype (lseektype.U):
635aebb7 3515 This variable defines lseektype to be something like off_t, long,
781b178c
JH
3516 or whatever type is used to declare lseek offset's type in the
3517 kernel (which also appears to be lseek's return type).
3518
d620c7b3 3519mad (mad.U):
a724edfe
NC
3520 This variable indicates that the Misc Attribute Definition code is to
3521 be compiled.
3522
52ca670a
MB
3523madlyh (mad.U):
3524 If the Misc Attribute Decoration is to be compiled, this variable is
3525 set to the name of the extra header files to be used, else it is ''
3526
3527madlyobj (mad.U):
3528 If the Misc Attribute Decoration is to be compiled, this variable is
3529 set to the name of the extra object files to be used, else it is ''
3530
3531madlysrc (mad.U):
3532 If the Misc Attribute Decoration is to be compiled, this variable is
3533 set to the name of the extra C source files to be used, else it is ''
3534
781b178c
JH
3535mail (Loc.U):
3536 This variable is defined but not used by Configure.
3537 The value is a plain '' and is not useful.
3538
3539mailx (Loc.U):
3540 This variable is defined but not used by Configure.
3541 The value is a plain '' and is not useful.
3542
3543make (Loc.U):
5bf26616 3544 This variable is used internally by Configure to determine the
c532c9d1
JH
3545 full pathname (if any) of the make program. After Configure runs,
3546 the value is reset to a plain "make" and is not useful.
3547
781b178c
JH
3548make_set_make (make.U):
3549 Some versions of 'make' set the variable MAKE. Others do not.
3550 This variable contains the string to be included in Makefile.SH
3551 so that MAKE is set if needed, and not if not needed.
3552 Possible values are:
44b94491 3553
781b178c 3554 make_set_make='#' # If your make program handles this for you,
44b94491 3555
781b178c 3556 make_set_make="MAKE=$make" # if it doesn't.
44b94491
MB
3557
3558 This uses a comment character to distinguish a
781b178c
JH
3559 'set' value (from a previous config.sh or Configure '-D' option)
3560 from an uncomputed value.
3561
3562mallocobj (mallocsrc.U):
3563 This variable contains the name of the malloc.o that this package
3564 generates, if that malloc.o is preferred over the system malloc.
3565 Otherwise the value is null. This variable is intended for generating
3566 Makefiles. See mallocsrc.
3567
3568mallocsrc (mallocsrc.U):
3569 This variable contains the name of the malloc.c that comes with
3570 the package, if that malloc.c is preferred over the system malloc.
3571 Otherwise the value is null. This variable is intended for generating
3572 Makefiles.
3573
3574malloctype (mallocsrc.U):
3575 This variable contains the kind of ptr returned by malloc and realloc.
3576
3577man1dir (man1dir.U):
3578 This variable contains the name of the directory in which manual
3579 source pages are to be put. It is the responsibility of the
3580 Makefile.SH to get the value of this into the proper command.
3581 You must be prepared to do the ~name expansion yourself.
3582
3583man1direxp (man1dir.U):
3584 This variable is the same as the man1dir variable, but is filename
3585 expanded at configuration time, for convenient use in makefiles.
3586
3587man1ext (man1dir.U):
3588 This variable contains the extension that the manual page should
3589 have: one of 'n', 'l', or '1'. The Makefile must supply the '.'.
3590 See man1dir.
3591
3592man3dir (man3dir.U):
3593 This variable contains the name of the directory in which manual
3594 source pages are to be put. It is the responsibility of the
3595 Makefile.SH to get the value of this into the proper command.
3596 You must be prepared to do the ~name expansion yourself.
3597
3598man3direxp (man3dir.U):
3599 This variable is the same as the man3dir variable, but is filename
3600 expanded at configuration time, for convenient use in makefiles.
3601
3602man3ext (man3dir.U):
3603 This variable contains the extension that the manual page should
3604 have: one of 'n', 'l', or '3'. The Makefile must supply the '.'.
3605 See man3dir.
3606
4d54317a
JH
3607Mcc (Loc.U):
3608 This variable is used internally by Configure to determine the
3609 full pathname (if any) of the Mcc program. After Configure runs,
3610 the value is reset to a plain "Mcc" and is not useful.
3611
781b178c
JH
3612mips_type (usrinc.U):
3613 This variable holds the environment type for the mips system.
3614 Possible values are "BSD 4.3" and "System V".
3615
65d1576c 3616mistrustnm (Csym.U):
5129fff4
JH
3617 This variable can be used to establish a fallthrough for the cases
3618 where nm fails to find a symbol. If usenm is false or usenm is true
3619 and mistrustnm is false, this variable has no effect. If usenm is true
3620 and mistrustnm is "compile", a test program will be compiled to try to
3621 find any symbol that can't be located via nm lookup. If mistrustnm is
3622 "run", the test program will be run as well as being compiled.
3623
781b178c 3624mkdir (Loc.U):
5bf26616 3625 This variable is used internally by Configure to determine the
781b178c
JH
3626 full pathname (if any) of the mkdir program. After Configure runs,
3627 the value is reset to a plain "mkdir" and is not useful.
3628
fe749a9f
JH
3629mmaptype (d_mmap.U):
3630 This symbol contains the type of pointer returned by mmap()
3631 (and simultaneously the type of the first argument).
3632 It can be 'void *' or 'caddr_t'.
3633
781b178c 3634modetype (modetype.U):
635aebb7
AL
3635 This variable defines modetype to be something like mode_t,
3636 int, unsigned short, or whatever type is used to declare file
781b178c
JH
3637 modes for system calls.
3638
3639more (Loc.U):
5bf26616 3640 This variable is used internally by Configure to determine the
781b178c
JH
3641 full pathname (if any) of the more program. After Configure runs,
3642 the value is reset to a plain "more" and is not useful.
3643
3644multiarch (multiarch.U):
3645 This variable conditionally defines the MULTIARCH symbol
3646 which signifies the presence of multiplatform files.
3647 This is normally set by hints files.
3648
3649mv (Loc.U):
3650 This variable is defined but not used by Configure.
3651 The value is a plain '' and is not useful.
3652
3653myarchname (archname.U):
3654 This variable holds the architecture name computed by Configure in
3655 a previous run. It is not intended to be perused by any user and
3656 should never be set in a hint file.
3657
3658mydomain (myhostname.U):
3659 This variable contains the eventual value of the MYDOMAIN symbol,
3660 which is the domain of the host the program is going to run on.
3661 The domain must be appended to myhostname to form a complete host name.
3662 The dot comes with mydomain, and need not be supplied by the program.
3663
3664myhostname (myhostname.U):
3665 This variable contains the eventual value of the MYHOSTNAME symbol,
3666 which is the name of the host the program is going to run on.
3667 The domain is not kept with hostname, but must be gotten from mydomain.
3668 The dot comes with mydomain, and need not be supplied by the program.
3669
3670myuname (Oldconfig.U):
3671 The output of 'uname -a' if available, otherwise the hostname. On Xenix,
3672 pseudo variables assignments in the output are stripped, thank you. The
3673 whole thing is then lower-cased.
3674
3675n (n.U):
3676 This variable contains the '-n' flag if that is what causes the echo
3677 command to suppress newline. Otherwise it is null. Correct usage is
3678 $echo $n "prompt for a question: $c".
3679
2cc61e15
DD
3680need_va_copy (need_va_copy.U):
3681 This symbol, if defined, indicates that the system stores
3682 the variable argument list datatype, va_list, in a format
3683 that cannot be copied by simple assignment, so that some
3684 other means must be used when copying is required.
3685 As such systems vary in their provision (or non-provision)
3686 of copying mechanisms, handy.h defines a platform-
3687 independent macro, Perl_va_copy(src, dst), to do the job.
3688
781b178c
JH
3689netdb_hlen_type (netdbtype.U):
3690 This variable holds the type used for the 2nd argument to
3691 gethostbyaddr(). Usually, this is int or size_t or unsigned.
3692 This is only useful if you have gethostbyaddr(), naturally.
3693
3694netdb_host_type (netdbtype.U):
3695 This variable holds the type used for the 1st argument to
3696 gethostbyaddr(). Usually, this is char * or void *, possibly
3697 with or without a const prefix.
3698 This is only useful if you have gethostbyaddr(), naturally.
3699
3700netdb_name_type (netdbtype.U):
3701 This variable holds the type used for the argument to
3702 gethostbyname(). Usually, this is char * or const char *.
3703 This is only useful if you have gethostbyname(), naturally.
3704
3705netdb_net_type (netdbtype.U):
3706 This variable holds the type used for the 1st argument to
3707 getnetbyaddr(). Usually, this is int or long.
3708 This is only useful if you have getnetbyaddr(), naturally.
3709
3710nm (Loc.U):
5bf26616 3711 This variable is used internally by Configure to determine the
781b178c
JH
3712 full pathname (if any) of the nm program. After Configure runs,
3713 the value is reset to a plain "nm" and is not useful.
3714
3715nm_opt (usenm.U):
3716 This variable holds the options that may be necessary for nm.
3717
3718nm_so_opt (usenm.U):
3719 This variable holds the options that may be necessary for nm
3720 to work on a shared library but that can not be used on an
3721 archive library. Currently, this is only used by Linux, where
3722 nm --dynamic is *required* to get symbols from an ELF library which
3723 has been stripped, but nm --dynamic is *fatal* on an archive library.
3724 Maybe Linux should just always set usenm=false.
3725
3726nonxs_ext (Extensions.U):
3727 This variable holds a list of all non-xs extensions included
3728 in the package. All of them will be built.
3729
3730nroff (Loc.U):
5bf26616 3731 This variable is used internally by Configure to determine the
781b178c
JH
3732 full pathname (if any) of the nroff program. After Configure runs,
3733 the value is reset to a plain "nroff" and is not useful.
3734
2f12987e
JH
3735nv_preserves_uv_bits (perlxv.U):
3736 This variable indicates how many of bits type uvtype
3737 a variable nvtype can preserve.
3738
6b4667fc
A
3739nveformat (perlxvf.U):
3740 This variable contains the format string used for printing
3741 a Perl NV using %e-ish floating point format.
3742
4d54317a
JH
3743nvEUformat (perlxvf.U):
3744 This variable contains the format string used for printing
3745 a Perl NV using %E-ish floating point format.
3746
6b4667fc
A
3747nvfformat (perlxvf.U):
3748 This variable confains the format string used for printing
3749 a Perl NV using %f-ish floating point format.
3750
4d54317a
JH
3751nvFUformat (perlxvf.U):
3752 This variable confains the format string used for printing
3753 a Perl NV using %F-ish floating point format.
3754
6b4667fc
A
3755nvgformat (perlxvf.U):
3756 This variable contains the format string used for printing
3757 a Perl NV using %g-ish floating point format.
3758
4d54317a
JH
3759nvGUformat (perlxvf.U):
3760 This variable contains the format string used for printing
3761 a Perl NV using %G-ish floating point format.
3762
a22e52b9
JH
3763nvsize (perlxv.U):
3764 This variable is the size of an NV in bytes.
3765
3766nvtype (perlxv.U):
3767 This variable contains the C type used for Perl's NV.
3768
781b178c
JH
3769o_nonblock (nblock_io.U):
3770 This variable bears the symbol value to be used during open() or fcntl()
3771 to turn on non-blocking I/O for a file descriptor. If you wish to switch
3772 between blocking and non-blocking, you may try ioctl(FIOSNBIO) instead,
3773 but that is only supported by some devices.
3774
3775obj_ext (Unix.U):
3776 This is an old synonym for _o.
3777
3778old_pthread_create_joinable (d_pthrattrj.U):
3779 This variable defines the constant to use for creating joinable
3780 (aka undetached) pthreads. Unused if pthread.h defines
3781 PTHREAD_CREATE_JOINABLE. If used, possible values are
3782 PTHREAD_CREATE_UNDETACHED and __UNDETACHED.
3783
3784optimize (ccflags.U):
3785 This variable contains any optimizer/debugger flag that should be used.
3786 It is up to the Makefile to use it.
3787
3788orderlib (orderlib.U):
3789 This variable is "true" if the components of libraries must be ordered
3790 (with `lorder $* | tsort`) before placing them in an archive. Set to
3791 "false" if ranlib or ar can generate random libraries.
3792
3793osname (Oldconfig.U):
3794 This variable contains the operating system name (e.g. sunos,
3795 solaris, hpux, etc.). It can be useful later on for setting
3796 defaults. Any spaces are replaced with underscores. It is set
3797 to a null string if we can't figure it out.
3798
3799osvers (Oldconfig.U):
3800 This variable contains the operating system version (e.g.
3801 4.1.3, 5.2, etc.). It is primarily used for helping select
3802 an appropriate hints file, but might be useful elsewhere for
3803 setting defaults. It is set to '' if we can't figure it out.
3804 We try to be flexible about how much of the version number
3805 to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the
3806 same for this package, hints files might just be os_4.0 or
3807 os_4.1, etc., not keeping separate files for each little release.
3808
3b777bb4
GS
3809otherlibdirs (otherlibdirs.U):
3810 This variable contains a colon-separated set of paths for the perl
3811 binary to search for additional library files or modules.
3812 These directories will be tacked to the end of @INC.
3813 Perl will automatically search below each path for version-
3814 and architecture-specific directories. See inc_version_list
3815 for more details.
3816 A value of ' ' means 'none' and is used to preserve this value
3817 for the next run through Configure.
3818
781b178c
JH
3819package (package.U):
3820 This variable contains the name of the package being constructed.
3821 It is primarily intended for the use of later Configure units.
3822
3823pager (pager.U):
3824 This variable contains the name of the preferred pager on the system.
3825 Usual values are (the full pathnames of) more, less, pg, or cat.
3826
3827passcat (nis.U):
3828 This variable contains a command that produces the text of the
3829 /etc/passwd file. This is normally "cat /etc/passwd", but can be
3830 "ypcat passwd" when NIS is used.
aaacdc8b
GS
3831 On some systems, such as os390, there may be no equivalent
3832 command, in which case this variable is unset.
781b178c
JH
3833
3834patchlevel (patchlevel.U):
3835 The patchlevel level of this package.
3836 The value of patchlevel comes from the patchlevel.h file.
ff935051 3837 In a version number such as 5.6.1, this is the "6".
c890dc6c 3838 In patchlevel.h, this is referred to as "PERL_VERSION".
781b178c
JH
3839
3840path_sep (Unix.U):
3841 This is an old synonym for p_ in Head.U, the character
3842 used to separate elements in the command shell search PATH.
3843
c890dc6c
JH
3844perl5 (perl5.U):
3845 This variable contains the full path (if any) to a previously
3846 installed perl5.005 or later suitable for running the script
3847 to determine inc_version_list.
3848
781b178c 3849perl (Loc.U):
c890dc6c
JH
3850 This variable is defined but not used by Configure.
3851 The value is a plain '' and is not useful.
781b178c 3852
a6d26a0d
JH
3853perl_patchlevel (patchlevel.U):
3854 This is the Perl patch level, a numeric change identifier,
3855 as defined by whichever source code maintenance system
3856 is used to maintain the patches; currently Perforce.
3857 It does not correlate with the Perl version numbers or
3858 the maintenance versus development dichotomy except
3859 by also being increasing.
3860
4d54317a
JH
3861PERL_REVISION (Oldsyms.U):
3862 In a Perl version number such as 5.6.2, this is the 5.
3863 This value is manually set in patchlevel.h
3864
3865PERL_SUBVERSION (Oldsyms.U):
3866 In a Perl version number such as 5.6.2, this is the 2.
3867 Values greater than 50 represent potentially unstable
3868 development subversions.
3869 This value is manually set in patchlevel.h
3870
3871PERL_VERSION (Oldsyms.U):
3872 In a Perl version number such as 5.6.2, this is the 6.
3873 This value is manually set in patchlevel.h
3874
781b178c
JH
3875perladmin (perladmin.U):
3876 Electronic mail address of the perl5 administrator.
3877
b7a73309
JH
3878perllibs (End.U):
3879 The list of libraries needed by Perl only (any libraries needed
3880 by extensions only will by dropped, if using dynamic loading).
3881
781b178c
JH
3882perlpath (perlpath.U):
3883 This variable contains the eventual value of the PERLPATH symbol,
3884 which contains the name of the perl interpreter to be used in
a10d74f3
PG
3885 shell scripts and in the "eval 'exec'" idiom. This variable is
3886 not necessarily the pathname of the file containing the perl
3887 interpreter; you must append the executable extension (_exe) if
3888 it is not already present. Note that Perl code that runs during
3889 the Perl build process cannot reference this variable, as Perl
3890 may not have been installed, or even if installed, may be a
3891 different version of Perl.
781b178c
JH
3892
3893pg (Loc.U):
5bf26616 3894 This variable is used internally by Configure to determine the
781b178c
JH
3895 full pathname (if any) of the pg program. After Configure runs,
3896 the value is reset to a plain "pg" and is not useful.
3897
3898phostname (myhostname.U):
3899 This variable contains the eventual value of the PHOSTNAME symbol,
3900 which is a command that can be fed to popen() to get the host name.
3901 The program should probably not presume that the domain is or isn't
3902 there already.
3903
3904pidtype (pidtype.U):
635aebb7 3905 This variable defines PIDTYPE to be something like pid_t, int,
781b178c
JH
3906 ushort, or whatever type is used to declare process ids in the kernel.
3907
3908plibpth (libpth.U):
3909 Holds the private path used by Configure to find out the libraries.
3910 Its value is prepend to libpth. This variable takes care of special
3911 machines, like the mips. Usually, it should be empty.
3912
3913pmake (Loc.U):
3914 This variable is defined but not used by Configure.
3915 The value is a plain '' and is not useful.
3916
3917pr (Loc.U):
3918 This variable is defined but not used by Configure.
3919 The value is a plain '' and is not useful.
3920
3921prefix (prefix.U):
3922 This variable holds the name of the directory below which the
3923 user will install the package. Usually, this is /usr/local, and
3924 executables go in /usr/local/bin, library stuff in /usr/local/lib,
3925 man pages in /usr/local/man, etc. It is only used to set defaults
3926 for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.
3927
3928prefixexp (prefix.U):
3929 This variable holds the full absolute path of the directory below
3930 which the user will install the package. Derived from prefix.
3931
3932privlib (privlib.U):
3933 This variable contains the eventual value of the PRIVLIB symbol,
3934 which is the name of the private library for this package. It may
3935 have a ~ on the front. It is up to the makefile to eventually create
3936 this directory while performing installation (with ~ substitution).
3937
3938privlibexp (privlib.U):
3939 This variable is the ~name expanded version of privlib, so that you
3940 may use it directly in Makefiles or shell scripts.
3941
428dc699
JH
3942procselfexe (d_procselfexe.U):
3943 If d_procselfexe is defined, $procselfexe is the filename
3944 of the symbolic link pointing to the absolute pathname of
3945 the executing program.
3946
781b178c
JH
3947prototype (prototype.U):
3948 This variable holds the eventual value of CAN_PROTOTYPE, which
3949 indicates the C compiler can handle funciton prototypes.
3950
3951ptrsize (ptrsize.U):