This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Various updates and fixes to some of the SysV IPC ops and their tests
[perl5.git] / cflags.SH
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1#!/bin/sh
2
cb9238a7 3# Generate the cflags script, which is used to determine what cflags
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4# to pass to the compiler for compiling the core perl.
5#
6# This does NOT affect the XS compilation (ext, dist, cpan)
7# since that uses %Config values directly.
8#
9# For example, since -Wall adds -Wunused-*, a bare -Wall (without
10# amending that with -Wno-unused-..., or with the PERL_UNUSED_...)
11# would be too much for XS code because there are too many generated
12# but often unused things.
13#
14# We create a temporary test C program and repeatedly compile it with
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15# various candidate flags, and from the compiler output, determine what
16# flags are supported.
ea14a82d 17#
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18# From this we initialise the following variables in the cflags script:
19#
ea14a82d 20# $myccflags (possibly edited version of $Config{ccflags})
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21# $warn
22# $stdflags
23# $extra
24# $_exe
25
a02608de 26case $PERL_CONFIG_SH in
1c3d792e 27'')
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28 if test -f config.sh; then TOP=.;
29 elif test -f ../config.sh; then TOP=..;
30 elif test -f ../../config.sh; then TOP=../..;
31 elif test -f ../../../config.sh; then TOP=../../..;
32 elif test -f ../../../../config.sh; then TOP=../../../..;
33 else
34 echo "Can't find config.sh."; exit 1
35 fi
36 . $TOP/config.sh
37 ;;
1c3d792e 38esac
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39# This forces SH files to create target in same directory as SH file.
40# This is so that make depend always knows where to find SH derivatives.
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41case "$0" in
42*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
43esac
bc730b18 44
37723ebb 45if test -f config_h.SH -a ! -f config.h; then
6ef8aa7c 46 . ./config_h.SH
11e2f395 47 CONFIG_H=already-done
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48fi
49
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50warn=''
51
52# Add -Wall for the core modules iff gcc and not already -Wall
53case "$gccversion" in
54'') ;;
55Intel*) ;; # The Intel C++ plays gcc on TV but is not really it.
56*) case "$ccflags" in
57 *-Wall*) ;;
58 *) warn="$warn -Wall" ;;
59 esac
60 ;;
61esac
62
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63# Create a test source file for testing what options can be fed to
64# gcc in this system; include a selection of most common and commonly
65# hairy include files.
66
67cat >_cflags.c <<__EOT__
68#include "EXTERN.h"
69#include "perl.h"
70/* The stdio.h, errno.h, and setjmp.h should be there in any ANSI C89. */
71#include <stdio.h>
72#include <errno.h>
73#include <setjmp.h>
74/* Just in case the inclusion of perl.h did not
75 * pull in enough system headers, let's try again. */
a07cd53d 76#include <stdlib.h>
a07cd53d 77#include <stddef.h>
a07cd53d 78#include <stdarg.h>
a07cd53d 79#include <limits.h>
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80#ifdef I_DIRENT
81#include <dirent.h>
82#endif
83#ifdef I_UNISTD
84#include <unistd.h>
85#endif
463bdbaf 86#ifdef I_SYS_TYPES
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87#include <sys/types.h>
88#endif
463bdbaf 89#ifdef I_SYS_PARAM
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90#include <sys/param.h>
91#endif
463bdbaf 92#ifdef I_SYS_RESOURCE
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93#include <sys/resource.h>
94#endif
463bdbaf 95#ifdef I_SYS_SELECT
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96#include <sys/select.h>
97#endif
98#if defined(HAS_SOCKET) && !defined(VMS) && !defined(WIN32) /* See perl.h. */
99#include <sys/socket.h>
100#endif
463bdbaf 101#ifdef I_SYS_STAT
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102#include <sys/stat.h>
103#endif
463bdbaf 104#ifdef I_SYS_TIME
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105#include <sys/time.h>
106#endif
463bdbaf 107#ifdef I_SYS_TIMES
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108#include <sys/times.h>
109#endif
463bdbaf 110#ifdef I_SYS_WAIT
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111#include <sys/wait.h>
112#endif
113/* The gcc -ansi can cause a lot of noise in Solaris because of:
114 /usr/include/sys/resource.h:148: warning: 'struct rlimit64' declared inside parameter list
115 */
116int main(int argc, char *argv[]) {
117
118/* Add here test code found to be problematic in some gcc platform. */
119
120/* Off_t/off_t is a struct in Solaris with largefiles, and with gcc -ansi
121 * that struct cannot be compared in some gcc releases with a flat
122 * integer, such as a STRLEN. */
123
215ed6ce 124 IV iv;
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125 Off_t t0a = 2;
126 STRLEN t0b = 3;
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127 int t0c = (STRLEN)t0a == t0b;
128
129 printf("%s: %d\n", argv[0], argc);
a07cd53d 130
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131/* In FreeBSD 6.2 (and probably other releases too), with -Duse64bitint,
132 perl will use atoll(3). However, that declaration is hidden in <stdlib.h>
133 if we force the compiler to use -std=c89 mode.
134*/
135 iv = Atol("42");
136
137 return (!t0c && (iv == 42)) ? 0 : -1; /* Try to avoid 'unused' warnings. */
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138}
139__EOT__
140
141stdflags=''
bc730b18 142
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143# Further gcc warning options. Build up a list of options that work.
144# Note that some problems may only show up with combinations of options,
145# e.g. a warning might show up only with -Wall -ansi, not with either
146# one individually.
813665af 147# TODO: Ponder whether to migrate this back to Configure so hints files can
215ed6ce 148# tweak it. Also, be paranoid about whether results we've deduced in Configure
813665af 149# (especially about things like long long, which are not in C89) will still be
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150# valid if we now add flags like -std=c89.
151
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152pedantic=''
153case "$gccansipedantic" in
154define) pedantic='-pedantic' ;;
155esac
156
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157case "$gccversion" in
158'') ;;
6bd6308f 159[12].*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
a07cd53d 160Intel*) ;; # # Is that you, Intel C++?
f049db42 161#
fd9d4a0b 162# NOTE 1: the -std=c89 without -pedantic is a bit pointless.
abf4b099 163# Just -std=c89 means "if there is room for interpretation,
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164# interpret the C89 way." It does NOT mean "strict C89" on its own.
165# You need to add the -pedantic for that. To do this with Configure,
166# do -Dgccansipedantic (note that the -ansi is included in any case,
167# the option is a bit oddly named, for historical reasons.)
168#
169# NOTE 2: -pedantic necessitates adding a couple of flags:
170# * -PERL_GCC_PEDANTIC so that the perl code can adapt: there's nothing
171# added by gcc itself to indicate pedanticness.
172# * -Wno-overlength-strings under -DDEBUGGING because quite many of
173# the LEAVE_with_name() and assert() calls generate string literals
174# longer then the ANSI minimum of 509 bytes.
175#
176# NOTE 3: the relative order of these options matters:
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177# -Wextra before -W
178# -std=c89 before -ansi
179# -pedantic* before -Werror=d-a-s
abf4b099 180#
dc9f0093 181*) warns="-std=c89 -ansi $pedantic \
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182 -Werror=pointer-arith \
183 -Wextra -W \
dc9f0093 184 -Wc++-compat -Wwrite-strings"
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185 # declaration after statement is normal in C++ rather than an
186 # extension and compilers complain if we try to warn about it
187 case "$d_cplusplus" in
188 define) ;;
189 *) warns="$warns -Werror=declaration-after-statement" ;;
190 esac
191 for opt in $warns
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192 do
193 case " $ccflags " in
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194 *" $opt "*) ;; # Skip if already there.
195 *) rm -f _cflags$_exe
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196 flags="-DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt"
197 case "$opt" in
198 *-pedantic*) flags="$flags -DPERL_GCC_PEDANTIC" ;;
199 esac
200 # echo "opt = $opt, flags = $flags"
201 cmd="$cc $flags _cflags.c -o _cflags$_exe"
202 out="`$cmd 2>&1`"
203 # echo "$cmd --> $out"
204 case "$out" in
bc730b18 205 *"unrecognized"*) ;;
d39195d4 206 *"unknown"*) ;;
215ed6ce 207 *"implicit declaration"*) ;; # Was something useful hidden?
bc730b18 208 *"Invalid"*) ;;
9ac4c107 209 *"is valid for C"*) ;;
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210 *) if test -x _cflags$_exe
211 then
212 case "$opt" in
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213 -std*)
214 echo "cflags.SH: Adding $opt."
215 stdflags="$stdflags $opt"
216 ;;
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217 -ansi)
218 # -std=c89 is the modern form of -ansi, so add
219 # -ansi only if -std=c89 is not there already.
220 case " $stdflags " in
221 *-std=c89*) ;;
222 *)
223 echo "cflags.SH: Adding $opt."
224 stdflags="$stdflags $opt"
225 ;;
226 esac
227 ;;
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228 -W)
229 # -Wextra is the modern form of -W, so add
230 # -W only if -Wextra is not there already.
231 case " $warn " in
232 *-Wextra*) ;;
233 *)
234 echo "cflags.SH: Adding $opt."
235 warn="$warn $opt"
236 ;;
237 esac
238 ;;
239 -Werror=declaration-after-statement)
240 # -pedantic* (with -std=c89) covers -Werror=d-a-s.
241 case "$stdflags$warn" in
242 *-std=c89*-pedantic*|*-pedantic*-std=c89*) ;;
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243 *)
244 echo "cflags.SH: Adding $opt."
245 warn="$warn $opt"
246 ;;
905ccdc7 247 esac
863ca36a 248 ;;
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249 -Werror=pointer-arith)
250 # -pedantic* covers -Werror=p-a
251 case "$warn" in
252 *-pedantic*) ;;
253 *)
254 echo "cflags.SH: Adding $opt."
255 warn="$warn $opt"
256 ;;
257 esac
258 ;;
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259 *)
260 echo "cflags.SH: Adding $opt."
261 warn="$warn $opt"
262 ;;
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263 esac
264 fi
265 ;;
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266 esac
267 ;;
268 esac
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269 case "$ccflags$warn" in
270 *-pedantic*)
271 overlength=''
272 case "$ccflags$optimize" in
273 *-DDEBUGGING*) overlength='-Wno-overlength-strings' ;;
274 esac
275 for opt2 in -DPERL_GCC_PEDANTIC $overlength
276 do
277 case "$ccflags$warn" in
278 *"$opt2"*) ;;
279 *) echo "cflags.SH: Adding $opt2 because of -pedantic."
280 warn="$warn $opt2" ;;
281 esac
282 done
283 ;;
284 esac
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285 done
286 ;;
287esac
a07cd53d 288rm -f _cflags.c _cflags$_exe
bc730b18 289
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290case "$gccversion" in
291'') ;;
292*)
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293 case "$warn$ccflags" in
294 *-pedantic*)
3e8416a3 295 # If we have -Duse64bitint (or equivalent) in effect and the quadtype
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296 # has become 'long long', gcc -pedantic* becomes unbearable
297 # (moreso when combined with -Wall) because long long and LL and %lld|%Ld
3e8416a3 298 # become warn-worthy. So let's drop the -pedantic in that case.
f049db42 299 #
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300 # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
301 # don't declare atoll() under -std=c89, but we need it. In general,
302 # insisting on -std=c89 is inconsistent with insisting on using
813665af 303 # 'long long'. So drop -std=c89 and -ansi as well if we're using
215ed6ce 304 # 'long long' as our main integral type.
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305 #
306 # usedtrace (DTrace) uses unportable features (dollars in identifiers,
307 # and gcc statement expressions), it is just easier to turn off pedantic.
308 remove=''
309 case "$quadtype:$ivtype:$sPRId64:$usedtrace" in
310 *"long long"*|*lld*|*Ld*) remove='long long' ;;
311 *) case "$usedtrace" in
312 define) remove='usedtrace' ;;
313 esac
314 ;;
315 esac
316 case "$remove" in
317 '') ;;
318 *) echo "cflags.SH: Removing -pedantic*, -std=c89, and -ansi because of $remove."
319 ccflags=`echo $ccflags|sed -e 's/-pedantic-errors/ /' -e 's/-pedantic/ /' -e 's/-std=c89/ /' -e 's/-ansi/ /' -e 's/-DPERL_GCC_PEDANTIC/ /'`
320 warn=`echo $warn|sed -e 's/-pedantic-errors/ /' -e 's/-pedantic/ /' -e 's/-ansi/ /' -e 's/-DPERL_GCC_PEDANTIC/ /'`
321 stdflags=`echo $stdflags|sed -e 's/-std=c89/ /'`
322 ;;
215ed6ce 323 esac
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324 ;;
325 esac
326 ;;
327esac
328
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329# Older clang releases are not wise enough for -Wunused-value.
330case "$gccversion" in
331*"Apple LLVM "[34]*|*"Apple LLVM version "[34]*)
332 for f in -Wno-unused-value
333 do
334 echo "cflags.SH: Adding $f because clang version '$gccversion'"
335 warn="$warn $f"
336 done
337 ;;
338esac
339
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340# The quadmath Q format specifier will cause -Wformat to whine.
341case "$gccversion" in
342'') ;;
343*) case "$usequadmath" in
344 define)
345 for f in -Wno-format
346 do
347 echo "cflags.SH: Adding $f because of usequadmath."
348 warn="$warn $f"
349 done
350 ;;
351 esac
352 ;;
353esac
354
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355case "$cc" in
356*g++*)
357 # Extra paranoia in case people have bad canned ccflags:
358 # bad in the sense that the flags are accepted by g++,
359 # but then whined about.
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360 #
361 # -Werror=d-a-s option is valid for g++, by definition,
362 # but we remove it just for cleanliness and shorter command lines.
363 for f in -Wdeclaration-after-statement \
364 -Werror=declaration-after-statement \
49c60343 365 -Wc++-compat \
d2d49204 366 -std=c89
5bd6d383 367 do
95f0c784 368 case "$ccflags$warn" in
5bd6d383 369 *"$f"*)
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370 echo "cflags.SH: Removing $f because of g++."
371 ccflags=`echo $ccflags|sed 's/$f/ /'`
372 warn=`echo $warn|sed 's/$f/ /'`
373 ;;
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374 esac
375 done
376 ;;
377esac
378
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379for f in -Wdeclaration-after-statement -Werror=declaration-after-statement \
380 -Wpointer-arith -Werror=pointer-arith
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381do
382 case "$cppflags" in
383 *"$f"*)
384 echo "cflags.SH: Removing $f from cppflags."
385 cppflags=`echo $cppflags|sed 's/$f/ /'` ;;
386 esac
387done
388
2eb17d1d 389# If usethreads and clang, add -Wthread-safety for clang 3.6 or later.
9ce5f19e 390# gccversion is defined also for clang, because compat, use that for matching.
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391# Apple overwrites clang version with XCode version, see hints/darwin.sh
392# for the gory details. Aggressively forward-proofing.
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393case "$usethreads" in
394define)
395case "$gccversion" in
2eb17d1d 396*" Clang 3."[56789]*|*" Clang "[456]*|*"Apple LLVM 6.1"*|*"Apple LLVM "[789]*)
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397 for f in -Wthread-safety
398 do
399 case " $warn " in
400 *" $f "*) ;; # Skip if already there.
401 *)
402 echo "cflags.SH: Adding $f because usethreads and clang and gccversion '$gccversion'"
403 warn="$warn $f"
404 ;;
405 esac
406 done
407;;
408esac
409;;
410esac
411
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412echo "cflags.SH: cc = $cc"
413echo "cflags.SH: ccflags = $ccflags"
414echo "cflags.SH: stdflags = $stdflags"
415echo "cflags.SH: optimize = $optimize"
416echo "cflags.SH: warn = $warn"
417
10edeb5d 418# Code to set any extra flags here.
a07cd53d 419extra=''
11fcce85 420
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421# Protect double or single quotes for better restoring of ccflags.
422myccflags=`echo $ccflags | sed -e 's/"/\\\"/g' -e "s/'/\\\'/g"`
423
2b317908 424echo "Extracting cflags (with variable substitutions)"
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425# This section of the file will have variable substitutions done on it.
426# Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
427# Protect any dollar signs and backticks that you do not want interpreted
428# by putting a backslash in front. You may delete these comments.
165b7424 429rm -f cflags
2b317908 430$spitshell >cflags <<!GROK!THIS!
ecfc5424 431$startsh
bc730b18 432
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433# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
434
435# This file is generated by cflags.SH
436
5bd6d383 437# Used to restore possible edits by cflags.SH.
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438myccflags="$myccflags"
439
11fcce85 440# Extra warnings, used e.g. for gcc.
bc730b18 441warn="$warn"
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442# Extra standardness.
443stdflags="$stdflags"
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444# Extra extra.
445extra="$extra"
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446# what do executables look like?
447_exe="$_exe"
bc730b18 448
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449!GROK!THIS!
450
44213caa 451# In the following dollars and backticks do not need the extra backslash.
2b317908 452$spitshell >>cflags <<'!NO!SUBS!'
a02608de 453case $PERL_CONFIG_SH in
2b317908 454'')
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455 if test -f config.sh; then TOP=.;
456 elif test -f ../config.sh; then TOP=..;
457 elif test -f ../../config.sh; then TOP=../..;
458 elif test -f ../../../config.sh; then TOP=../../..;
459 elif test -f ../../../../config.sh; then TOP=../../../..;
460 else
461 echo "Can't find config.sh."; exit 1
462 fi
463 . $TOP/config.sh
57d2761b 464 ccflags="$myccflags" # Restore possible edits by cflags.SH.
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465 ;;
466esac
467
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468# syntax: cflags [optimize=XXX] [file[.suffix]] ...
469# displays the proposed compiler command line for each 'file'
470#
471# with no file, dispalys it for all *.c files.
472# The optimise=XXX arg (if present) is evalled, setting the default
473# value of the $optimise variable, which is output on the command line
474# (but which may be overridden for specific files below)
75550b4e 475
1167a30e 476case "X$1" in
26102cc7 477Xoptimize=*|X"optimize=*")
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478 eval "$1"
479 shift
480 ;;
481esac
482
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483case $# in
4840) set *.c; echo "The current C flags are:" ;;
1c3d792e 485esac
2b317908 486
578789a7 487set `echo "$* " | sed -e 's/\.[oc] / /g' -e 's/\.obj / /g' -e "s/\\$obj_ext / /g"`
2b317908 488
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489for file do
490
491 case "$#" in
492 1) ;;
2b317908 493 *) echo $n " $file.c $c" ;;
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494 esac
495
44213caa 496 # allow variables like toke_cflags to be evaluated
2b317908 497
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498 case "$file" in
499 */*) ;;
500 *) eval 'eval ${'"${file}_cflags"'-""}' ;;
501 esac
2b317908 502
44213caa 503 # or customize here
2b317908 504
1c3d792e 505 case "$file" in
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506 regcomp) : work around http://bugs.debian.org/754054
507 case $archname in
508 mips-*|mipsel-*)
509 optimize="$optimize -fno-tree-vrp";;
510 esac;;
1c3d792e 511 *) ;;
5729ffdd 512
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513 # Customization examples follow.
514 #
515 # The examples are intentionally unreachable as the '*)' case above always
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516 # matches. To use them, move before the '*)' and edit as appropriate.
517 # It is not a good idea to set ccflags to an absolute value here, as it
518 # often contains general -D defines which are needed for correct
519 # compilation. It is better to edit ccflags as shown, using interpolation
520 # to add flags, or sed to remove flags.
5729ffdd 521
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522 av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
523 deb) ccflags="$ccflags -fno-jump-tables" ;;
524 hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
525 toke) optimize=-O0 ;;
7e827271 526 esac
666ea192 527
b1e55cab 528 echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
2b317908 529
a0d0e21e 530 . $TOP/config.sh
2b317908 531
a7d59441 532 # end per file behaviour
1c3d792e 533done
2b317908 534!NO!SUBS!
a0d0e21e 535chmod 755 cflags
2b317908 536$eunicefix cflags