3 # Generate the cflags script, which is used to determine what cflags
4 # to pass to the compiler for compiling the core perl.
6 # This does NOT affect the XS compilation (ext, dist, cpan)
7 # since that uses %Config values directly.
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.
14 # We create a temporary test C program and repeatedly compile it with
15 # various candidate flags, and from the compiler output, determine what
16 # flags are supported.
18 # From this we initialise the following variables in the cflags script:
20 # $myccflags (possibly edited version of $Config{ccflags})
26 case $PERL_CONFIG_SH in
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=../../../..;
34 echo "Can't find config.sh."; exit 1
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.
42 */*) cd `expr X$0 : 'X\(.*\)/'` ;;
45 if test -f config_h.SH -a ! -f config.h; then
52 # Add -Wall for the core modules iff gcc and not already -Wall
55 Intel*) ;; # The Intel C++ plays gcc on TV but is not really it.
58 *) warn="$warn -Wall" ;;
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.
67 cat >_cflags.c <<__EOT__
70 /* The stdio.h, errno.h, and setjmp.h should be there in any ANSI C89. */
74 /* Just in case the inclusion of perl.h did not
75 * pull in enough system headers, let's try again. */
87 #include <sys/types.h>
90 #include <sys/param.h>
93 #include <sys/resource.h>
96 #include <sys/select.h>
98 #if defined(HAS_SOCKET) && !defined(VMS) && !defined(WIN32) /* See perl.h. */
99 #include <sys/socket.h>
102 #include <sys/stat.h>
105 #include <sys/time.h>
108 #include <sys/times.h>
111 #include <sys/wait.h>
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
116 int main(int argc, char *argv[]) {
118 /* Add here test code found to be problematic in some gcc platform. */
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. */
127 int t0c = (STRLEN)t0a == t0b;
129 printf("%s: %d\n", argv[0], argc);
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.
137 return (!t0c && (iv == 42)) ? 0 : -1; /* Try to avoid 'unused' warnings. */
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
147 # TODO: Ponder whether to migrate this back to Configure so hints files can
148 # tweak it. Also, be paranoid about whether results we've deduced in Configure
149 # (especially about things like long long, which are not in C89) will still be
150 # valid if we now add flags like -std=c89.
153 case "$gccansipedantic" in
154 define) pedantic='-pedantic' ;;
157 case "$gccversion" in
159 [12].*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
160 Intel*) ;; # # Is that you, Intel C++?
162 # NOTE 1: the -std=c89 without -pedantic is a bit pointless.
163 # Just -std=c89 means "if there is room for interpretation,
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.)
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.
176 # NOTE 3: the relative order of these options matters:
178 # -std=c89 before -ansi
179 # -pedantic* before -Werror=d-a-s
181 *) warns="-std=c89 -ansi $pedantic \
182 -Werror=pointer-arith \
184 -Wc++-compat -Wwrite-strings"
185 # declaration after statement is normal in C++ rather than an
186 # extension and compilers complain if we try to warn about it
187 case "$d_cplusplus" in
189 *) warns="$warns -Werror=declaration-after-statement" ;;
194 *" $opt "*) ;; # Skip if already there.
195 *) rm -f _cflags$_exe
196 flags="-DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt"
198 *-pedantic*) flags="$flags -DPERL_GCC_PEDANTIC" ;;
200 # echo "opt = $opt, flags = $flags"
201 cmd="$cc $flags _cflags.c -o _cflags$_exe"
203 # echo "$cmd --> $out"
207 *"implicit declaration"*) ;; # Was something useful hidden?
209 *"is valid for C"*) ;;
210 *) if test -x _cflags$_exe
214 echo "cflags.SH: Adding $opt."
215 stdflags="$stdflags $opt"
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
223 echo "cflags.SH: Adding $opt."
224 stdflags="$stdflags $opt"
229 # -Wextra is the modern form of -W, so add
230 # -W only if -Wextra is not there already.
234 echo "cflags.SH: Adding $opt."
239 -Werror=declaration-after-statement)
240 # -pedantic* (with -std=c89) covers -Werror=d-a-s.
241 case "$stdflags$warn" in
242 *-std=c89*-pedantic*|*-pedantic*-std=c89*) ;;
244 echo "cflags.SH: Adding $opt."
249 -Werror=pointer-arith)
250 # -pedantic* covers -Werror=p-a
254 echo "cflags.SH: Adding $opt."
260 echo "cflags.SH: Adding $opt."
269 case "$ccflags$warn" in
272 case "$ccflags$optimize" in
273 *-DDEBUGGING*) overlength='-Wno-overlength-strings' ;;
275 for opt2 in -DPERL_GCC_PEDANTIC $overlength
277 case "$ccflags$warn" in
279 *) echo "cflags.SH: Adding $opt2 because of -pedantic."
280 warn="$warn $opt2" ;;
288 rm -f _cflags.c _cflags$_exe
290 case "$gccversion" in
293 case "$warn$ccflags" in
295 # If we have -Duse64bitint (or equivalent) in effect and the quadtype
296 # has become 'long long', gcc -pedantic* becomes unbearable
297 # (moreso when combined with -Wall) because long long and LL and %lld|%Ld
298 # become warn-worthy. So let's drop the -pedantic in that case.
300 # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
301 # don't declare atoll() under -std=c89, but we need it. In general,
302 # insisting on -std=c89 is inconsistent with insisting on using
303 # 'long long'. So drop -std=c89 and -ansi as well if we're using
304 # 'long long' as our main integral type.
306 # usedtrace (DTrace) uses unportable features (dollars in identifiers,
307 # and gcc statement expressions), it is just easier to turn off pedantic.
309 case "$quadtype:$ivtype:$sPRId64:$usedtrace" in
310 *"long long"*|*lld*|*Ld*) remove='long long' ;;
311 *) case "$usedtrace" in
312 define) remove='usedtrace' ;;
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 $stdflags|sed -e 's/-std=c89/ /'`
329 # Older clang releases are not wise enough for -Wunused-value.
330 case "$gccversion" in
331 *"Apple LLVM "[34]*|*"Apple LLVM version "[34]*)
332 for f in -Wno-unused-value
334 echo "cflags.SH: Adding $f because clang version '$gccversion'"
340 # The quadmath Q format specifier will cause -Wformat to whine.
341 case "$gccversion" in
343 *) case "$usequadmath" in
347 echo "cflags.SH: Adding $f because of usequadmath."
357 # Extra paranoia in case people have bad canned ccflags:
358 # bad in the sense that the flags are accepted by g++,
359 # but then whined about.
361 # -Werror=d-a-s option is valid for g++, by definition,
362 # but we remove it just for cleanliness and shorter command lines.
363 for f in -Wdeclaration-after-statement \
364 -Werror=declaration-after-statement \
368 case "$ccflags$warn" in
370 echo "cflags.SH: Removing $f because of g++."
371 ccflags=`echo $ccflags|sed 's/$f/ /'`
372 warn=`echo $warn|sed 's/$f/ /'`
379 for f in -Wdeclaration-after-statement -Werror=declaration-after-statement \
380 -Wpointer-arith -Werror=pointer-arith
384 echo "cflags.SH: Removing $f from cppflags."
385 cppflags=`echo $cppflags|sed 's/$f/ /'` ;;
389 # If usethreads and clang, add -Wthread-safety for clang 3.6 or later.
390 # gccversion is defined also for clang, because compat, use that for matching.
391 # Apple overwrites clang version with XCode version, see hints/darwin.sh
392 # for the gory details. Aggressively forward-proofing.
393 case "$usethreads" in
395 case "$gccversion" in
396 *" Clang 3."[56789]*|*" Clang "[456]*|*"Apple LLVM 6.1"*|*"Apple LLVM "[789]*)
397 for f in -Wthread-safety
400 *" $f "*) ;; # Skip if already there.
402 echo "cflags.SH: Adding $f because usethreads and clang and gccversion '$gccversion'"
412 echo "cflags.SH: cc = $cc"
413 echo "cflags.SH: ccflags = $ccflags"
414 echo "cflags.SH: stdflags = $stdflags"
415 echo "cflags.SH: optimize = $optimize"
416 echo "cflags.SH: warn = $warn"
418 # Code to set any extra flags here.
421 # Protect double or single quotes for better restoring of ccflags.
422 myccflags=`echo $ccflags | sed -e 's/"/\\\"/g' -e "s/'/\\\'/g"`
424 echo "Extracting cflags (with variable substitutions)"
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.
430 $spitshell >cflags <<!GROK!THIS!
433 # !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
435 # This file is generated by cflags.SH
437 # Used to restore possible edits by cflags.SH.
438 myccflags="$myccflags"
440 # Extra warnings, used e.g. for gcc.
442 # Extra standardness.
446 # what do executables look like?
451 # In the following dollars and backticks do not need the extra backslash.
452 $spitshell >>cflags <<'!NO!SUBS!'
453 case $PERL_CONFIG_SH in
455 if test -f config.sh; then TOP=.;
456 elif test -f ../config.sh; then TOP=..;
457 elif test -f ../../config.sh; then TOP=../..;
458 elif test -f ../../../config.sh; then TOP=../../..;
459 elif test -f ../../../../config.sh; then TOP=../../../..;
461 echo "Can't find config.sh."; exit 1
464 ccflags="$myccflags" # Restore possible edits by cflags.SH.
468 # syntax: cflags [optimize=XXX] [file[.suffix]] ...
469 # displays the proposed compiler command line for each 'file'
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 $optimise variable, which is output on the command line
474 # (but which may be overridden for specific files below)
477 Xoptimize=*|X"optimize=*")
484 0) set *.c; echo "The current C flags are:" ;;
487 set `echo "$* " | sed -e 's/\.[oc] / /g' -e 's/\.obj / /g' -e "s/\\$obj_ext / /g"`
493 *) echo $n " $file.c $c" ;;
496 # allow variables like toke_cflags to be evaluated
500 *) eval 'eval ${'"${file}_cflags"'-""}' ;;
506 regcomp) : work around http://bugs.debian.org/754054
509 optimize="$optimize -fno-tree-vrp";;
513 # Customization examples follow.
515 # The examples are intentionally unreachable as the '*)' case above always
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.
522 av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
523 deb) ccflags="$ccflags -fno-jump-tables" ;;
524 hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
525 toke) optimize=-O0 ;;
528 echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
532 # end per file behaviour