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[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. */
76#ifdef I_STDLIB
77#include <stdlib.h>
78#endif
79#ifdef I_STDDEF
80#include <stddef.h>
81#endif
82#ifdef I_STDARG
83#include <stdarg.h>
84#endif
85#ifdef I_LIMITS
86#include <limits.h>
87#endif
88#ifdef I_DIRENT
89#include <dirent.h>
90#endif
91#ifdef I_UNISTD
92#include <unistd.h>
93#endif
463bdbaf 94#ifdef I_SYS_TYPES
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95#include <sys/types.h>
96#endif
463bdbaf 97#ifdef I_SYS_PARAM
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98#include <sys/param.h>
99#endif
463bdbaf 100#ifdef I_SYS_RESOURCE
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101#include <sys/resource.h>
102#endif
463bdbaf 103#ifdef I_SYS_SELECT
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104#include <sys/select.h>
105#endif
106#if defined(HAS_SOCKET) && !defined(VMS) && !defined(WIN32) /* See perl.h. */
107#include <sys/socket.h>
108#endif
463bdbaf 109#ifdef I_SYS_STAT
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110#include <sys/stat.h>
111#endif
463bdbaf 112#ifdef I_SYS_TIME
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113#include <sys/time.h>
114#endif
463bdbaf 115#ifdef I_SYS_TIMES
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116#include <sys/times.h>
117#endif
463bdbaf 118#ifdef I_SYS_WAIT
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119#include <sys/wait.h>
120#endif
121/* The gcc -ansi can cause a lot of noise in Solaris because of:
122 /usr/include/sys/resource.h:148: warning: 'struct rlimit64' declared inside parameter list
123 */
124int main(int argc, char *argv[]) {
125
126/* Add here test code found to be problematic in some gcc platform. */
127
128/* Off_t/off_t is a struct in Solaris with largefiles, and with gcc -ansi
129 * that struct cannot be compared in some gcc releases with a flat
130 * integer, such as a STRLEN. */
131
215ed6ce 132 IV iv;
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133 Off_t t0a = 2;
134 STRLEN t0b = 3;
135 int t0c = t0a == t0b;
136
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137/* In FreeBSD 6.2 (and probably other releases too), with -Duse64bitint,
138 perl will use atoll(3). However, that declaration is hidden in <stdlib.h>
139 if we force the compiler to use -std=c89 mode.
140*/
141 iv = Atol("42");
142
143 return (!t0c && (iv == 42)) ? 0 : -1; /* Try to avoid 'unused' warnings. */
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144}
145__EOT__
146
147stdflags=''
bc730b18 148
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149# Further gcc warning options. Build up a list of options that work.
150# Note that some problems may only show up with combinations of options,
151# e.g. a warning might show up only with -Wall -ansi, not with either
152# one individually.
813665af 153# TODO: Ponder whether to migrate this back to Configure so hints files can
215ed6ce 154# tweak it. Also, be paranoid about whether results we've deduced in Configure
813665af 155# (especially about things like long long, which are not in C89) will still be
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156# valid if we now add flags like -std=c89.
157
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158case "$gccversion" in
159'') ;;
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160[12]*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
161Intel*) ;; # # Is that you, Intel C++?
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162# XXX Note that -std=c89 without -pedantic is rather pointless.
163# Just -std=c89 means "if there is room for interpretation,
164# interpret the C89 way." It does NOT mean "strict C89",
165# you would need to add the -pedantic to get that.
166#
167# XXX If -pedantic (or -pedantic-errors!) is ever added,
d2d49204 168# the -Werror=declaration-after-statement can be removed
abf4b099 169# since "-std=c89 -pedantic" implies the -Werror=d-a-s.
905ccdc7 170*) for opt in -ansi -std=c89 -Wextra -W \
d2d49204 171 -Werror=declaration-after-statement \
fae2e960 172 -Wc++-compat -Wwrite-strings
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173 do
174 case " $ccflags " in
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175 *" $opt "*) ;; # Skip if already there.
176 *) rm -f _cflags$_exe
4b76cb9d 177 case "`$cc -DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
bc730b18 178 *"unrecognized"*) ;;
d39195d4 179 *"unknown"*) ;;
215ed6ce 180 *"implicit declaration"*) ;; # Was something useful hidden?
bc730b18 181 *"Invalid"*) ;;
9ac4c107 182 *"is valid for C"*) ;;
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183 *) if test -x _cflags$_exe
184 then
185 case "$opt" in
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186 -std*)
187 echo "cflags.SH: Adding $opt."
188 stdflags="$stdflags $opt"
189 ;;
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190 *) case "$opt" in
191 -W)
192 # -Wextra is the modern form of -W, so add
193 # -W only if -Wextra is not there already.
194 case " $warn " in
195 *-Wextra*) ;;
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196 *)
197 echo "cflags.SH: Adding $opt."
198 warn="$warn opt"
199 ;;
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200 esac
201 ;;
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202 *)
203 echo "cflags.SH: Adding $opt."
204 warn="$warn $opt"
205 ;;
905ccdc7 206 esac
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207 esac
208 fi
209 ;;
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210 esac
211 ;;
212 esac
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213 done
214 ;;
215esac
a07cd53d 216rm -f _cflags.c _cflags$_exe
bc730b18 217
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218case "$gccversion" in
219'') ;;
220*)
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221 if [ "$gccansipedantic" = "" ]; then
222 # If we have -Duse64bitint (or equivalent) in effect and the quadtype
223 # has become 'long long', gcc -pedantic becomes unbearable (moreso
224 # when combined with -Wall) because long long and LL and %lld|%Ld
225 # become warn-worthy. So let's drop the -pedantic in that case.
226 case "$quadtype:$sPRId64" in
227 "long long"*|*lld*|*Ld*)
5bd6d383 228 echo "cflags.SH: Removing -pedantic and warn because of quadtype='long long'."
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229 ccflags="`echo $ccflags|sed 's/-pedantic/ /'`"
230 warn="`echo $warn|sed 's/-pedantic/ /'`"
231 ;;
232 esac
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233 # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
234 # don't declare atoll() under -std=c89, but we need it. In general,
235 # insisting on -std=c89 is inconsistent with insisting on using
813665af 236 # 'long long'. So drop -std=c89 and -ansi as well if we're using
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237 # 'long long' as our main integral type.
238 case "$ivtype" in
239 "long long")
5bd6d383 240 echo "cflags.SH: Removing -pedantic, -std=c89, and -ansi because of ivtype='long long'."
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241 ccflags=`echo $ccflags|sed -e 's/-pedantic/ /' -e 's/-std=c89/ /' -e 's/-ansi/ /'`
242 warn=`echo $warn|sed -e 's/-pedantic/ /' -e 's/-ansi/ /'`
a5105380 243 stdflags=`echo $stdflags|sed -e 's/-std=c89/ /'`
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244 ;;
245 esac
3e8416a3 246 fi
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247 # Using certain features (like the gcc statement expressions)
248 # requires knowing whether -pedantic has been specified.
9ac4c107 249 case "$warn$ccflags" in
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250 *-pedantic*)
251 echo "cflags.SH: Adding -DPERL_PEDANTIC because of -pedantic."
252 warn="$warn -DPERL_GCC_PEDANTIC"
253 ;;
254 esac
255 ;;
256esac
257
258case "$cc" in
259*g++*)
260 # Extra paranoia in case people have bad canned ccflags:
261 # bad in the sense that the flags are accepted by g++,
262 # but then whined about.
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263 #
264 # -Werror=d-a-s option is valid for g++, by definition,
265 # but we remove it just for cleanliness and shorter command lines.
266 for f in -Wdeclaration-after-statement \
267 -Werror=declaration-after-statement \
268 -std=c89
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269 do
270 case "$ccflags" in
271 *"$f"*)
272 echo "cflags.SH: Removing $ccflags because of g++."
273 ccflags=`echo $ccflags|sed 's/$f/ /'` ;;
274 esac
275 done
276 ;;
277esac
278
d2d49204 279for f in -Wdeclaration-after-statement -Werror=declaration-after-statement
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280do
281 case "$cppflags" in
282 *"$f"*)
283 echo "cflags.SH: Removing $f from cppflags."
284 cppflags=`echo $cppflags|sed 's/$f/ /'` ;;
285 esac
286done
287
10edeb5d 288# Code to set any extra flags here.
a07cd53d 289extra=''
11fcce85 290
2b317908 291echo "Extracting cflags (with variable substitutions)"
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292# This section of the file will have variable substitutions done on it.
293# Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
294# Protect any dollar signs and backticks that you do not want interpreted
295# by putting a backslash in front. You may delete these comments.
165b7424 296rm -f cflags
2b317908 297$spitshell >cflags <<!GROK!THIS!
ecfc5424 298$startsh
bc730b18 299
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300# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
301
302# This file is generated by cflags.SH
303
5bd6d383 304# Used to restore possible edits by cflags.SH.
57d2761b 305myccflags="$ccflags"
11fcce85 306# Extra warnings, used e.g. for gcc.
bc730b18 307warn="$warn"
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308# Extra standardness.
309stdflags="$stdflags"
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310# Extra extra.
311extra="$extra"
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312# what do executables look like?
313_exe="$_exe"
bc730b18 314
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315!GROK!THIS!
316
44213caa 317# In the following dollars and backticks do not need the extra backslash.
2b317908 318$spitshell >>cflags <<'!NO!SUBS!'
a02608de 319case $PERL_CONFIG_SH in
2b317908 320'')
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321 if test -f config.sh; then TOP=.;
322 elif test -f ../config.sh; then TOP=..;
323 elif test -f ../../config.sh; then TOP=../..;
324 elif test -f ../../../config.sh; then TOP=../../..;
325 elif test -f ../../../../config.sh; then TOP=../../../..;
326 else
327 echo "Can't find config.sh."; exit 1
328 fi
329 . $TOP/config.sh
57d2761b 330 ccflags="$myccflags" # Restore possible edits by cflags.SH.
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331 ;;
332esac
333
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334# syntax: cflags [optimize=XXX] [file[.suffix]] ...
335# displays the proposed compiler command line for each 'file'
336#
337# with no file, dispalys it for all *.c files.
338# The optimise=XXX arg (if present) is evalled, setting the default
339# value of the $optimise variable, which is output on the command line
340# (but which may be overridden for specific files below)
75550b4e 341
1167a30e 342case "X$1" in
26102cc7 343Xoptimize=*|X"optimize=*")
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344 eval "$1"
345 shift
346 ;;
347esac
348
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349case $# in
3500) set *.c; echo "The current C flags are:" ;;
1c3d792e 351esac
2b317908 352
578789a7 353set `echo "$* " | sed -e 's/\.[oc] / /g' -e 's/\.obj / /g' -e "s/\\$obj_ext / /g"`
2b317908 354
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355for file do
356
357 case "$#" in
358 1) ;;
2b317908 359 *) echo $n " $file.c $c" ;;
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360 esac
361
44213caa 362 # allow variables like toke_cflags to be evaluated
2b317908 363
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364 if echo $file | grep -v / >/dev/null
365 then
366 eval 'eval ${'"${file}_cflags"'-""}'
367 fi
2b317908 368
44213caa 369 # or customize here
2b317908 370
1c3d792e 371 case "$file" in
1c3d792e 372 *) ;;
5729ffdd 373
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374 # Customization examples follow.
375 #
376 # The examples are intentionally unreachable as the '*)' case above always
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377 # matches. To use them, move before the '*)' and edit as appropriate.
378 # It is not a good idea to set ccflags to an absolute value here, as it
379 # often contains general -D defines which are needed for correct
380 # compilation. It is better to edit ccflags as shown, using interpolation
381 # to add flags, or sed to remove flags.
5729ffdd 382
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383 av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
384 deb) ccflags="$ccflags -fno-jump-tables" ;;
385 hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
386 toke) optimize=-O0 ;;
7e827271 387 esac
666ea192 388
44213caa 389 # Can we perhaps use $ansi2knr here
b1e55cab 390 echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
2b317908 391
a0d0e21e 392 . $TOP/config.sh
2b317908 393
a7d59441 394 # end per file behaviour
1c3d792e 395done
2b317908 396!NO!SUBS!
a0d0e21e 397chmod 755 cflags
2b317908 398$eunicefix cflags