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Some Tru64 C compilers have C++ components that confuse
[perl5.git] / hints / dec_osf.sh
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a0d0e21e 1# hints/dec_osf.sh
8e964347 2
b971f6e4 3# * If you want to debug perl or want to send a
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4# stack trace for inclusion into an bug report, call
5# Configure with the additional argument -Doptimize=-g2
6# or uncomment this assignment to "optimize":
7#
8#optimize=-g2
9#
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10# If you want both to optimise and debug with the DEC cc
11# you must have -g3, e.g. "-O4 -g3", and (re)run Configure.
12#
b971f6e4 13# * gcc can always have both -g and optimisation on.
8a019ce7 14#
b971f6e4 15# * debugging optimised code, no matter what compiler
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16# one is using, can be surprising and confusing because of
17# the optimisation tricks like code motion, code removal,
18# loop unrolling, and inlining. The source code and the
19# executable code simply do not agree any more while in
20# mid-execution, the optimiser only cares about the results.
21#
b971f6e4 22# * Configure will automatically add the often quoted
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23# -DDEBUGGING for you if the -g is specified.
24#
b971f6e4 25# * There is even more optimisation available in the new
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26# (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them.
27# The jury is still out whether either or neither help for Perl
28# and how much. Based on very quick testing, -fast boosts
29# raw data copy by about 5-15% (-fast brings in, among other
30# things, inlined, ahem, fast memcpy()), while on the other
31# hand searching things (index, m//, s///), seems to get slower.
32# Your mileage will vary.
8e964347 33#
b971f6e4 34# * The -std is needed because the following compiled
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35# without the -std and linked with -lm
36#
37# #include <math.h>
38# #include <stdio.h>
39# int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
40#
41# will in Digital UNIX 3.* and 4.0b print 0 -- and in Digital
42# UNIX 4.0{,a} dump core: Floating point exception in the printf(),
43# the y has become a signaling NaN.
44#
b971f6e4 45# * Compilation warnings like:
46#
47# "Undefined the ANSI standard macro ..."
48#
49# can be ignored, at least while compiling the POSIX extension
50# and especially if using the sfio (the latter is not a standard
51# part of Perl, never mind if it says little to you).
52#
8e964347 53
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54# If using the DEC compiler we must find out the DEC compiler style:
55# the style changed between Digital UNIX (aka DEC OSF/1) 3 and
56# Digital UNIX 4. The old compiler was originally from Ultrix and
57# the MIPS company, the new compiler is originally from the VAX world
58# and it is called GEM. Many of the options we are going to use depend
59# on the compiler style.
60
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61cc=${cc:-cc}
62
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63# do NOT, I repeat, *NOT* take away the leading tabs
64# Configure Black Magic (TM)
b971f6e4 65 # reset
e60a08f8 66 _DEC_cc_style=
8d5a0f9f 67case "`$cc -v 2>&1 | grep cc`" in
f931c1d2 68*gcc*) _gcc_version=`$cc --version 2>&1 | tr . ' '`
2cae8c0d 69 set $_gcc_version
3f8b8817 70 if test "$1" -lt 2 -o \( "$1" -eq 2 -a \( "$2" -lt 95 -o \( "$2" -eq 95 -a "$3" -lt 2 \) \) \); then
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71 cat >&4 <<EOF
72
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73*** Your cc seems to be gcc and its version ($_gcc_version) seems to be
74*** less than 2.95.2. This is not a good idea since old versions of gcc
75*** are known to produce buggy code when compiling Perl (and no doubt for
76*** other programs, too).
3f8b8817 77***
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78*** Therefore, I strongly suggest upgrading your gcc. (Why don't you use
79*** the vendor cc is also a good question. It comes with the operating
3f8b8817 80*** system and produces good code.)
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81
82Cannot continue, aborting.
83
84EOF
85 exit 1
86 fi
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87 if test "$1" -eq 2 -a "$2" -eq 95 -a "$3" -le 2; then
88 cat >&4 <<EOF
89
90*** Note that as of gcc 2.95.2 (19991024) and Perl 5.6.0 (March 2000)
91*** if the said Perl is compiled with the said gcc the lib/sdbm test
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92*** may dump core (meaning that the SDBM_File extension is unusable).
93*** As this core dump never happens with the vendor cc, this is most
94*** probably a lingering bug in gcc. Therefore unless you have a better
95*** gcc installation you are still better off using the vendor cc.
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96
97Since you explicitly chose gcc, I assume that you know what are doing.
98
99EOF
100 fi
2cae8c0d 101 ;;
e60a08f8 102*) # compile something small: taint.c is fine for this.
4de7e3a2 103 ccversion=`cc -V | awk '/(Compaq|DEC) C/ {print $3}' | grep '^V'`
e60a08f8 104 # the main point is the '-v' flag of 'cc'.
52c7d5b6 105 case "`cc -v -I. -c taint.c -o taint$$.o 2>&1`" in
e60a08f8 106 */gemc_cc*) # we have the new DEC GEM CC
dfa3a3d3 107 _DEC_cc_style=new
8a019ce7 108 ;;
e60a08f8 109 *) # we have the old MIPS CC
dfa3a3d3 110 _DEC_cc_style=old
8a019ce7 111 ;;
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112 esac
113 # cleanup
52c7d5b6 114 rm -f taint$$.o
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115 ;;
116esac
117
b971f6e4 118# be nauseatingly ANSI
8d5a0f9f 119case "`$cc -v 2>&1 | grep gcc`" in
9607fc9c 120*gcc*) ccflags="$ccflags -ansi"
b971f6e4 121 ;;
122*) ccflags="$ccflags -std"
123 ;;
124esac
125
126# for gcc the Configure knows about the -fpic:
127# position-independent code for dynamic loading
128
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129# we want optimisation
130
131case "$optimize" in
8d5a0f9f 132'') case "`$cc -v 2>&1 | grep gcc`" in
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133 *gcc*)
134 optimize='-O3' ;;
135 *) case "$_DEC_cc_style" in
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136 new) optimize='-O4'
137 ccflags="$ccflags -fprm d -ieee"
138 ;;
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139 old) optimize='-O2 -Olimit 3200' ;;
140 esac
b971f6e4 141 ccflags="$ccflags -D_INTRINSICS"
e60a08f8 142 ;;
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143 esac
144 ;;
1fc4cb55 145esac
28757baa 146
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147# Make glibpth agree with the compiler suite. Note that /shlib
148# is not here. That's on purpose. Even though that's where libc
149# really lives from V4.0 on, the linker (and /sbin/loader) won't
150# look there by default. The sharable /sbin utilities were all
151# built with "-Wl,-rpath,/shlib" to get around that. This makes
152# no attempt to figure out the additional location(s) searched by
153# gcc, since not all versions of gcc are easily coerced into
154# revealing that information.
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155glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
156glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
313489a2 157
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158# dlopen() is in libc
159libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
160
b971f6e4 161# libPW contains nothing useful for perl
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162libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
163
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164# libnet contains nothing useful for perl here, and doesn't work
165libswanted="`echo $libswanted | sed -e 's/ net / /'`"
166
b971f6e4 167# libbsd contains nothing used by perl that is not already in libc
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168libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
169
b971f6e4 170# libc need not be separately listed
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171libswanted="`echo $libswanted | sed -e 's/ c / /'`"
172
b971f6e4 173# ndbm is already in libc
174libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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175
176# the basic lddlflags used always
177lddlflags='-shared -expect_unresolved "*"'
178
b971f6e4 179# Fancy compiler suites use optimising linker as well as compiler.
180# <spider@Orb.Nashua.NH.US>
b8f0c030 181case "`uname -r`" in
b971f6e4 182*[123].*) # old loader
183 lddlflags="$lddlflags -O3"
184 ;;
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185*) if $test "X$optimize" = "X$undef"; then
186 lddlflags="$lddlflags -msym"
187 else
baa8820a 188 case "`/usr/sbin/sizer -v`" in
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189 *4.0D*)
190 # QAR 56761: -O4 + .so may produce broken code,
191 # fixed in 4.0E or better.
192 ;;
193 *)
194 lddlflags="$lddlflags $optimize"
195 ;;
196 esac
197 # -msym: If using a sufficiently recent /sbin/loader,
198 # keep the module symbols with the modules.
baa8820a 199 lddlflags="$lddlflags -msym -std"
a07564da 200 fi
b971f6e4 201 ;;
202esac
203# Yes, the above loses if gcc does not use the system linker.
204# If that happens, let me know about it. <jhi@iki.fi>
205
8a019ce7 206
b971f6e4 207# If debugging or (old systems and doing shared)
208# then do not strip the lib, otherwise, strip.
209# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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210case "$optimize" in
211 *-g*) ;; # left intentionally blank
b8f0c030 212*) case "`uname -r`" in
b971f6e4 213 *[123].*)
214 case "$useshrplib" in
215 false|undef|'') lddlflags="$lddlflags -s" ;;
216 esac
217 ;;
8a019ce7 218 *) lddlflags="$lddlflags -s"
b971f6e4 219 ;;
220 esac
221 ;;
8a019ce7 222esac
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223
224#
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225# Make embedding in things like INN and Apache more memory friendly.
226# Keep it overridable on the Configure command line, though, so that
227# "-Uuseshrplib" prevents this default.
228#
229
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230case "$_DEC_cc_style.$useshrplib" in
231 new.) useshrplib="$define" ;;
232esac
313489a2 233
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234# The EFF_ONLY_OK from <sys/access.h> is present but dysfunctional for
235# [RWX]_OK as of Digital UNIX 4.0[A-D]?. If and when this gets fixed,
236# please adjust this appropriately. See also pp_sys.c just before the
237# emulate_eaccess().
5ff3f7a4 238
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239# Fixed in V5.0A.
240case "`/usr/sbin/sizer -v`" in
f60a5d46 241*5.0[A-Z]*|*5.[1-9]*|*[6-9].[0-9]*)
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242 : ok
243 ;;
244*)
245# V5.0 or previous
5ff3f7a4 246pp_sys_cflags='ccflags="$ccflags -DNO_EFF_ONLY_OK"'
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247 ;;
248esac
5ff3f7a4 249
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250# The off_t is already 8 bytes, so we do have largefileness.
251
f60a5d46 252cat > UU/usethreads.cbu <<'EOCBU'
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253# This script UU/usethreads.cbu will get 'called-back' by Configure
254# after it has prompted the user for whether to use threads.
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255case "$usethreads" in
256$define|true|[yY]*)
75d72f2c 257 # Threads interfaces changed with V4.0.
8d5a0f9f 258 case "`$cc -v 2>&1 | grep gcc`" in
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259 *gcc*)ccflags="-D_REENTRANT $ccflags" ;;
260 *) case "`uname -r`" in
261 *[123].*) ccflags="-threads $ccflags" ;;
262 *) ccflags="-pthread $ccflags" ;;
263 esac
104d25b7 264 ;;
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265 esac
266 case "`uname -r`" in
267 *[123].*) libswanted="$libswanted pthreads mach exc c_r" ;;
268 *) libswanted="$libswanted pthread exc" ;;
269 esac
e883c329 270
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271 case "$usemymalloc" in
272 '')
273 usemymalloc='n'
274 ;;
275 esac
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276 ;;
277esac
278EOCBU
279
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280cat > UU/uselongdouble.cbu <<'EOCBU'
281# This script UU/uselongdouble.cbu will get 'called-back' by Configure
282# after it has prompted the user for whether to use long doubles.
283case "$uselongdouble" in
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284$define|true|[yY]*)
285 case "`/usr/sbin/sizer -v`" in
286 *[1-4].0*) cat >&4 <<EOF
287
288***
289*** Sorry, you cannot use long doubles in pre-V5.0 releases of Tru64.
290***
291
292Cannot continue, aborting.
293
294EOF
295 exit 1
296 ;;
297 esac
298 d_Gconvert='sprintf((b),"%.*Lg",(n),(x))'
299 ;;
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300esac
301EOCBU
302
1cade9fc 303case "`/usr/sbin/sizer -v`" in
bef5f079 304*[1-4].0*) d_modfl=undef ;; # must wait till 5.0
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305esac
306
313489a2 307#
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308# Unset temporary variables no more needed.
309#
310
311unset _DEC_cc_style
312
313#
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314# History:
315#
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316# perl5.005_51:
317#
318# September-1998 Jarkko Hietaniemi <jhi@iki.fi>
319#
320# * Added the -DNO_EFF_ONLY_OK flag ('use filetest;' support).
321#
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322# perl5.004_57:
323#
324# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
325#
85ab1d1d 326# * Newer Digital UNIX compilers enforce signaling for NaN without
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327# -ieee. Added -fprm d at the same time since it's friendlier for
328# embedding.
329#
330# * Fixed the library search path to match cc, ld, and /sbin/loader.
331#
332# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
333# still overrides.
334#
335# * Fix -pthread additions for useshrplib. ld has no -pthread option.
336#
337#
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338# perl5.004_04:
339#
340# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
341#
342# * libnet on Digital UNIX is for JAVA, not for sockets.
343#
344#
b971f6e4 345# perl5.003_28:
346#
347# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
348#
349# * Restructuring Spider's suggestions.
350#
351# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
352#
353# * ld -s cannot be used in older Digital UNIXes when doing shared.
354#
355#
356# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
357#
358# * -hidden removed.
359#
360# * -DSTANDARD_C removed.
361#
362# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
363#
364# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
365#
366# * -msym for the newer runtime loaders.
367#
368# * $optimize also in $lddflags.
369#
370#
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371# perl5.003_27:
372#
373# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
374#
375# * unset _DEC_cc_style and more commentary on -std.
376#
377#
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378# perl5.003_26:
379#
380# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
381#
e60a08f8 382# * -std and -ansi.
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383#
384#
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385# perl5.003_24:
386#
387# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
388#
389# * Fixing the note on -DDEBUGGING.
390#
391# * Note on -O5 -fast.
392#
393#
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394# perl5.003_23:
395#
396# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
397#
398# * Notes on how to do both optimisation and debugging.
399#
400#
401# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
402#
403# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
404#
405# * Restructure the $lddlflags build.
406#
407# * $optimize based on which compiler we have.
408#
409#
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410# perl5.003_22:
411#
412# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
413#
414# * Added comments 'how to create a debugging version of perl'
415#
416# * Fixed logic of this script to prevent stripping of shared
417# objects by the loader (see ld man page for -s) is debugging
418# is set via the -g switch.
419#
420#
421# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
422#
423# * now 'dl' is always removed from libswanted. Not only if
424# optimize is an empty string.
425#
426#
427# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
428#
429# * Removed 'dl' from libswanted: When the FreePort binary
430# translator for Sun binaries is installed Configure concludes
431# that it should use libdl.x.yz.fpx.so :-(
432# Because the dlopen, dlclose,... calls are in the
433# C library it not necessary at all to check for the
434# dl library. Therefore dl is removed from libswanted.
435#
436#
437# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
438#
439# * Set -Olimit to 3200 because perl_yylex.c got too big
440# for the optimizer.
441#