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Allow cflags.SH edits to ccflags to stick.
[perl5.git] / cflags.SH
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1#!/bin/sh
2
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3# Generate the cflags script, which is used to determine what cflags
4# to pass to the compiler.
5# We create a temporary test c program and repeatedly compile it with
6# various candidate flags, and from the compiler output, determine what
7# flags are supported.
8# From this we initialise the following variables in the cflags script:
9#
10# $warn
11# $stdflags
12# $extra
13# $_exe
14
a02608de 15case $PERL_CONFIG_SH in
1c3d792e 16'')
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17 if test -f config.sh; then TOP=.;
18 elif test -f ../config.sh; then TOP=..;
19 elif test -f ../../config.sh; then TOP=../..;
20 elif test -f ../../../config.sh; then TOP=../../..;
21 elif test -f ../../../../config.sh; then TOP=../../../..;
22 else
23 echo "Can't find config.sh."; exit 1
24 fi
25 . $TOP/config.sh
26 ;;
1c3d792e 27esac
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28# This forces SH files to create target in same directory as SH file.
29# This is so that make depend always knows where to find SH derivatives.
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30case "$0" in
31*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
32esac
bc730b18 33
37723ebb 34if test -f config_h.SH -a ! -f config.h; then
6ef8aa7c 35 . ./config_h.SH
11e2f395 36 CONFIG_H=already-done
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37fi
38
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39warn=''
40
41# Add -Wall for the core modules iff gcc and not already -Wall
42case "$gccversion" in
43'') ;;
44Intel*) ;; # The Intel C++ plays gcc on TV but is not really it.
45*) case "$ccflags" in
46 *-Wall*) ;;
47 *) warn="$warn -Wall" ;;
48 esac
49 ;;
50esac
51
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52# Create a test source file for testing what options can be fed to
53# gcc in this system; include a selection of most common and commonly
54# hairy include files.
55
56cat >_cflags.c <<__EOT__
57#include "EXTERN.h"
58#include "perl.h"
59/* The stdio.h, errno.h, and setjmp.h should be there in any ANSI C89. */
60#include <stdio.h>
61#include <errno.h>
62#include <setjmp.h>
63/* Just in case the inclusion of perl.h did not
64 * pull in enough system headers, let's try again. */
65#ifdef I_STDLIB
66#include <stdlib.h>
67#endif
68#ifdef I_STDDEF
69#include <stddef.h>
70#endif
71#ifdef I_STDARG
72#include <stdarg.h>
73#endif
74#ifdef I_LIMITS
75#include <limits.h>
76#endif
77#ifdef I_DIRENT
78#include <dirent.h>
79#endif
80#ifdef I_UNISTD
81#include <unistd.h>
82#endif
463bdbaf 83#ifdef I_SYS_TYPES
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84#include <sys/types.h>
85#endif
463bdbaf 86#ifdef I_SYS_PARAM
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87#include <sys/param.h>
88#endif
463bdbaf 89#ifdef I_SYS_RESOURCE
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90#include <sys/resource.h>
91#endif
463bdbaf 92#ifdef I_SYS_SELECT
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93#include <sys/select.h>
94#endif
95#if defined(HAS_SOCKET) && !defined(VMS) && !defined(WIN32) /* See perl.h. */
96#include <sys/socket.h>
97#endif
463bdbaf 98#ifdef I_SYS_STAT
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99#include <sys/stat.h>
100#endif
463bdbaf 101#ifdef I_SYS_TIME
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102#include <sys/time.h>
103#endif
463bdbaf 104#ifdef I_SYS_TIMES
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105#include <sys/times.h>
106#endif
463bdbaf 107#ifdef I_SYS_WAIT
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108#include <sys/wait.h>
109#endif
110/* The gcc -ansi can cause a lot of noise in Solaris because of:
111 /usr/include/sys/resource.h:148: warning: 'struct rlimit64' declared inside parameter list
112 */
113int main(int argc, char *argv[]) {
114
115/* Add here test code found to be problematic in some gcc platform. */
116
117/* Off_t/off_t is a struct in Solaris with largefiles, and with gcc -ansi
118 * that struct cannot be compared in some gcc releases with a flat
119 * integer, such as a STRLEN. */
120
215ed6ce 121 IV iv;
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122 Off_t t0a = 2;
123 STRLEN t0b = 3;
124 int t0c = t0a == t0b;
125
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126/* In FreeBSD 6.2 (and probably other releases too), with -Duse64bitint,
127 perl will use atoll(3). However, that declaration is hidden in <stdlib.h>
128 if we force the compiler to use -std=c89 mode.
129*/
130 iv = Atol("42");
131
132 return (!t0c && (iv == 42)) ? 0 : -1; /* Try to avoid 'unused' warnings. */
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133}
134__EOT__
135
136stdflags=''
bc730b18 137
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138# Further gcc warning options. Build up a list of options that work.
139# Note that some problems may only show up with combinations of options,
140# e.g. a warning might show up only with -Wall -ansi, not with either
141# one individually.
142# TODO: Ponder whether to migrate this back to Configure so hints files can
143# tweak it. Also, be paranoid about whether results we've deduced in Configure
144# (especially about things like long long, which are not in C89) will still be
145# valid if we now add flags like -std=c89.
146
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147case "$gccversion" in
148'') ;;
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149[12]*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
150Intel*) ;; # # Is that you, Intel C++?
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151*) for opt in -ansi -std=c89 -W -Wextra -Wdeclaration-after-statement \
152 -Wendif-labels -Wc++-compat -Wwrite-strings
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153 do
154 case " $ccflags " in
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155 *" $opt "*) ;; # Skip if already there.
156 *) rm -f _cflags$_exe
4b76cb9d 157 case "`$cc -DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
bc730b18 158 *"unrecognized"*) ;;
d39195d4 159 *"unknown"*) ;;
215ed6ce 160 *"implicit declaration"*) ;; # Was something useful hidden?
bc730b18 161 *"Invalid"*) ;;
9ac4c107 162 *"is valid for C"*) ;;
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163 *) if test -x _cflags$_exe
164 then
165 case "$opt" in
166 -std*) stdflags="$stdflags $opt" ;;
167 *) warn="$warn $opt" ;;
168 esac
169 fi
170 ;;
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171 esac
172 ;;
173 esac
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174 done
175 ;;
176esac
a07cd53d 177rm -f _cflags.c _cflags$_exe
bc730b18 178
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179case "$gccversion" in
180'') ;;
181*)
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182 if [ "$gccansipedantic" = "" ]; then
183 # If we have -Duse64bitint (or equivalent) in effect and the quadtype
184 # has become 'long long', gcc -pedantic becomes unbearable (moreso
185 # when combined with -Wall) because long long and LL and %lld|%Ld
186 # become warn-worthy. So let's drop the -pedantic in that case.
187 case "$quadtype:$sPRId64" in
188 "long long"*|*lld*|*Ld*)
189 ccflags="`echo $ccflags|sed 's/-pedantic/ /'`"
190 warn="`echo $warn|sed 's/-pedantic/ /'`"
191 ;;
192 esac
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193 # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
194 # don't declare atoll() under -std=c89, but we need it. In general,
195 # insisting on -std=c89 is inconsistent with insisting on using
196 # 'long long'. So drop -std=c89 and -ansi as well if we're using
197 # 'long long' as our main integral type.
198 case "$ivtype" in
199 "long long")
200 ccflags=`echo $ccflags|sed -e 's/-pedantic/ /' -e 's/-std=c89/ /' -e 's/-ansi/ /'`
201 warn=`echo $warn|sed -e 's/-pedantic/ /' -e 's/-ansi/ /'`
a5105380 202 stdflags=`echo $stdflags|sed -e 's/-std=c89/ /'`
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203 ;;
204 esac
3e8416a3 205 fi
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206 # Using certain features (like the gcc statement expressions)
207 # requires knowing whether -pedantic has been specified.
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208 case "$warn$ccflags" in
209 *-pedantic*) warn="$warn -DPERL_GCC_PEDANTIC" ;;
210 esac
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211 ;;
212esac
b1e55cab 213
10edeb5d 214# Code to set any extra flags here.
a07cd53d 215extra=''
11fcce85 216
2b317908 217echo "Extracting cflags (with variable substitutions)"
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218# This section of the file will have variable substitutions done on it.
219# Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
220# Protect any dollar signs and backticks that you do not want interpreted
221# by putting a backslash in front. You may delete these comments.
165b7424 222rm -f cflags
2b317908 223$spitshell >cflags <<!GROK!THIS!
ecfc5424 224$startsh
bc730b18 225
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226# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
227
228# This file is generated by cflags.SH
229
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230# Base flags. myccflags so that the possible edits by cflags.SH will stick.
231myccflags="$ccflags"
11fcce85 232# Extra warnings, used e.g. for gcc.
bc730b18 233warn="$warn"
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234# Extra standardness.
235stdflags="$stdflags"
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236# Extra extra.
237extra="$extra"
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238# what do executables look like?
239_exe="$_exe"
bc730b18 240
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241!GROK!THIS!
242
44213caa 243# In the following dollars and backticks do not need the extra backslash.
2b317908 244$spitshell >>cflags <<'!NO!SUBS!'
a02608de 245case $PERL_CONFIG_SH in
2b317908 246'')
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247 if test -f config.sh; then TOP=.;
248 elif test -f ../config.sh; then TOP=..;
249 elif test -f ../../config.sh; then TOP=../..;
250 elif test -f ../../../config.sh; then TOP=../../..;
251 elif test -f ../../../../config.sh; then TOP=../../../..;
252 else
253 echo "Can't find config.sh."; exit 1
254 fi
255 . $TOP/config.sh
57d2761b 256 ccflags="$myccflags" # Restore possible edits by cflags.SH.
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257 ;;
258esac
259
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260# syntax: cflags [optimize=XXX] [file[.suffix]] ...
261# displays the proposed compiler command line for each 'file'
262#
263# with no file, dispalys it for all *.c files.
264# The optimise=XXX arg (if present) is evalled, setting the default
265# value of the $optimise variable, which is output on the command line
266# (but which may be overridden for specific files below)
75550b4e 267
1167a30e 268case "X$1" in
26102cc7 269Xoptimize=*|X"optimize=*")
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270 eval "$1"
271 shift
272 ;;
273esac
274
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275case $# in
2760) set *.c; echo "The current C flags are:" ;;
1c3d792e 277esac
2b317908 278
578789a7 279set `echo "$* " | sed -e 's/\.[oc] / /g' -e 's/\.obj / /g' -e "s/\\$obj_ext / /g"`
2b317908 280
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281for file do
282
283 case "$#" in
284 1) ;;
2b317908 285 *) echo $n " $file.c $c" ;;
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286 esac
287
44213caa 288 # allow variables like toke_cflags to be evaluated
2b317908 289
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290 if echo $file | grep -v / >/dev/null
291 then
292 eval 'eval ${'"${file}_cflags"'-""}'
293 fi
2b317908 294
44213caa 295 # or customize here
2b317908 296
1c3d792e 297 case "$file" in
1c3d792e 298 *) ;;
5729ffdd 299
44213caa 300 # Customization examples follow:
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301 av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
302 deb) ccflags="$ccflags -fno-jump-tables" ;;
303 hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
304 toke) optimize=-O0 ;;
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305 esac
306
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307 # The examples are intentionally unreachable as the '*)' case always
308 # matches. To use them, move before the '*)' and edit as appropriate.
309 # It is not a good idea to set ccflags to an absolute value here, as it
310 # often contains general -D defines which are needed for correct
311 # compilation. It is better to edit ccflags as shown, using interpolation
312 # to add flags, or sed to remove flags.
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313
314
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315 case "$cc" in
316 *g++*)
317 # Extra paranoia in case people have bad canned ccflags:
318 # bad in the sense that the flags are accepted by g++,
319 # but then whined about.
320 for f in -Wdeclaration-after-statement -std=c89
321 do
322 ccflags=`echo $ccflags|sed 's/$f/ /'`
323 done
324 ;;
325 esac
326 cppflags=`echo $cppflags|sed 's/-Wdeclaration-after-statement/ /'`
327
328 case "$cc" in
eb387cb8 329 *clang*)
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330 # clang complains a lot about -Wunused-value which are not fixable
331 warn="$warn -Wno-unused-value"
332 ;;
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333 *g++*)
334 # Without -Wno-unused-variable g++ 4.x compiles are rather unwatchable
335 # because of all the warnings about Perl___notused, and g++ doesn't do
336 # __attribute__((unused)) (and even if at some stage it may, people do
337 # have older gcc installations), and ((void)x) isn't enough to silence
338 # the noises about XS functions not using their cv parameter, so we need
339 # the -Wno-unused-parameter too.
340 # Yes, we lose some valid warnings, but hopefully other compilers
341 # (like gcc) will still pick up those warnings.
342 for o in -Wno-unused-variable -Wno-unused-parameter
343 do
344 case "$warn" in
345 *$o*) ;;
346 *) warn="$warn $o" ;;
347 esac
348 done
349 ;;
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350 *)
351 # clang may not be called clang
352 case "`$cc -v 2>&1`" in
353 *clang*)
354 case "$warn" in
355 *-Wno-unused-value) ;;
356 *) warn="$warn -Wno-unused-value"
357 esac
358 esac
7e827271 359 esac
666ea192 360
69c7f294 361
44213caa 362 # Can we perhaps use $ansi2knr here
b1e55cab 363 echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
2b317908 364
a0d0e21e 365 . $TOP/config.sh
2b317908 366
a7d59441 367 # end per file behaviour
1c3d792e 368done
2b317908 369!NO!SUBS!
a0d0e21e 370chmod 755 cflags
2b317908 371$eunicefix cflags