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m4/attributes.m4
321 строка
11 KB
Sam James
m4: fix -Wstrict-protoypes
22 ноя 2022, 06:17
22 ноя 2022, 06:17
9d71834
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dnl Macros to check the presence of generic (non-typed) symbols. dnl Copyright (c) 2006-2007 Diego Pettenò <flameeyes@gmail.com> dnl Copyright (c) 2006-2007 xine project dnl dnl This program is free software; you can redistribute it and/or modify dnl it under the terms of the GNU General Public License as published by dnl the Free Software Foundation; either version 2, or (at your option) dnl any later version. dnl dnl This program is distributed in the hope that it will be useful, dnl but WITHOUT ANY WARRANTY; without even the implied warranty of dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the dnl GNU General Public License for more details. dnl dnl You should have received a copy of the GNU General Public License dnl along with this program; if not, write to the Free Software dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA dnl 02110-1301, USA. dnl dnl As a special exception, the copyright owners of the dnl macro gives unlimited permission to copy, distribute and modify the dnl configure scripts that are the output of Autoconf when processing the dnl Macro. You need not follow the terms of the GNU General Public dnl License when using or distributing such scripts, even though portions dnl of the text of the Macro appear in them. The GNU General Public dnl License (GPL) does govern all other use of the material that dnl constitutes the Autoconf Macro. dnl dnl This special exception to the GPL applies to versions of the dnl Autoconf Macro released by this project. When you make and dnl distribute a modified version of the Autoconf Macro, you may extend dnl this special exception to the GPL to apply to your modified version as dnl well. dnl Check if the flag is supported by compiler dnl CC_CHECK_CFLAGS_SILENT([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [ AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]), [ac_save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $1" AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; }])], [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"], [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"]) CFLAGS="$ac_save_CFLAGS" ]) AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes], [$2], [$3]) ]) dnl Check if the flag is supported by compiler (cacheable) dnl CC_CHECK_CFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) AC_DEFUN([CC_CHECK_CFLAGS], [ AC_CACHE_CHECK([if $CC supports $1 flag], AS_TR_SH([cc_cv_cflags_$1]), CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here! ) AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes], [$2], [$3]) ]) dnl CC_CHECK_CFLAG_APPEND(FLAG, [action-if-found], [action-if-not-found]) dnl Check for CFLAG and appends them to CFLAGS if supported AC_DEFUN([CC_CHECK_CFLAG_APPEND], [ AC_CACHE_CHECK([if $CC supports $1 flag], AS_TR_SH([cc_cv_cflags_$1]), CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here! ) AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes], [CFLAGS="$CFLAGS $1"; $2], [$3]) ]) dnl CC_CHECK_CFLAGS_APPEND([FLAG1 FLAG2], [action-if-found], [action-if-not]) AC_DEFUN([CC_CHECK_CFLAGS_APPEND], [ for flag in $1; do CC_CHECK_CFLAG_APPEND($flag, [$2], [$3]) done ]) dnl Check if the flag is supported by linker (cacheable) dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) AC_DEFUN([CC_CHECK_LDFLAGS], [ AC_CACHE_CHECK([if $CC supports $1 flag], AS_TR_SH([cc_cv_ldflags_$1]), [ac_save_LDFLAGS="$LDFLAGS" LDFLAGS="$LDFLAGS $1" AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 1; }])], [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"], [eval "AS_TR_SH([cc_cv_ldflags_$1])="]) LDFLAGS="$ac_save_LDFLAGS" ]) AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes], [$2], [$3]) ]) dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for dnl the current linker to avoid undefined references in a shared object. AC_DEFUN([CC_NOUNDEFINED], [ dnl We check $host for which systems to enable this for. AC_REQUIRE([AC_CANONICAL_HOST]) case $host in dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads dnl are requested, as different implementations are present; to avoid problems dnl use -Wl,-z,defs only for those platform not behaving this way. *-freebsd* | *-openbsd*) ;; *) dnl First of all check for the --no-undefined variant of GNU ld. This allows dnl for a much more readable commandline, so that people can understand what dnl it does without going to look for what the heck -z defs does. for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"]) break done ;; esac AC_SUBST([LDFLAGS_NOUNDEFINED]) ]) dnl Check for a -Werror flag or equivalent. -Werror is the GCC dnl and ICC flag that tells the compiler to treat all the warnings dnl as fatal. We usually need this option to make sure that some dnl constructs (like attributes) are not simply ignored. dnl dnl Other compilers don't support -Werror per se, but they support dnl an equivalent flag: dnl - Sun Studio compiler supports -errwarn=%all AC_DEFUN([CC_CHECK_WERROR], [ AC_CACHE_CHECK( [for $CC way to treat warnings as errors], [cc_cv_werror], [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror], [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])]) ]) ]) AC_DEFUN([CC_CHECK_ATTRIBUTE], [ AC_REQUIRE([CC_CHECK_WERROR]) AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))], AS_TR_SH([cc_cv_attribute_$1]), [ac_save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $cc_cv_werror" AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])], [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"], [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"]) CFLAGS="$ac_save_CFLAGS" ]) AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes], [AC_DEFINE( AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1, [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))] ) $4], [$5]) ]) AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [ CC_CHECK_ATTRIBUTE( [constructor],, [extern void foo(void); void __attribute__((constructor)) ctor(void) { foo(); }], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_DESTRUCTOR], [ CC_CHECK_ATTRIBUTE( [destructor],, [extern void foo(void); void __attribute__((destructor)) dtor(void) { foo(); }], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_FORMAT], [ CC_CHECK_ATTRIBUTE( [format], [format(printf, n, n)], [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [ CC_CHECK_ATTRIBUTE( [format_arg], [format_arg(printf)], [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [ CC_CHECK_ATTRIBUTE( [visibility_$1], [visibility("$1")], [void __attribute__((visibility("$1"))) $1_function(void) { }], [$2], [$3]) ]) AC_DEFUN([CC_ATTRIBUTE_NONNULL], [ CC_CHECK_ATTRIBUTE( [nonnull], [nonnull()], [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; }], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_UNUSED], [ CC_CHECK_ATTRIBUTE( [unused], , [void some_function(void *foo, __attribute__((unused)) void *bar);], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [ CC_CHECK_ATTRIBUTE( [sentinel], , [void some_function(void *foo, ...) __attribute__((sentinel));], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [ CC_CHECK_ATTRIBUTE( [deprecated], , [void some_function(void *foo, ...) __attribute__((deprecated));], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_ALIAS], [ CC_CHECK_ATTRIBUTE( [alias], [weak, alias], [void other_function(void *foo) { } void some_function(void *foo) __attribute__((weak, alias("other_function")));], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_MALLOC], [ CC_CHECK_ATTRIBUTE( [malloc], , [void * __attribute__((malloc)) my_alloc(int n);], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_PACKED], [ CC_CHECK_ATTRIBUTE( [packed], , [struct astructure { char a; int b; long c; void *d; } __attribute__((packed)); char assert@<:@(sizeof(struct astructure) == (sizeof(char)+sizeof(int)+sizeof(long)+sizeof(void*)))-1@:>@;], [$1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_CONST], [ CC_CHECK_ATTRIBUTE( [const], , [int __attribute__((const)) twopow(int n) { return 1 << n; } ], [$1], [$2]) ]) AC_DEFUN([CC_FLAG_VISIBILITY], [ AC_REQUIRE([CC_CHECK_WERROR]) AC_CACHE_CHECK([if $CC supports -fvisibility=hidden], [cc_cv_flag_visibility], [cc_flag_visibility_save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $cc_cv_werror" CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden], cc_cv_flag_visibility='yes', cc_cv_flag_visibility='no') CFLAGS="$cc_flag_visibility_save_CFLAGS"]) AS_IF([test "x$cc_cv_flag_visibility" = "xyes"], [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1, [Define this if the compiler supports the -fvisibility flag]) $1], [$2]) ]) AC_DEFUN([CC_FUNC_EXPECT], [ AC_REQUIRE([CC_CHECK_WERROR]) AC_CACHE_CHECK([if compiler has __builtin_expect function], [cc_cv_func_expect], [ac_save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $cc_cv_werror" AC_COMPILE_IFELSE([AC_LANG_SOURCE( [int some_function() { int a = 3; return (int)__builtin_expect(a, 3); }])], [cc_cv_func_expect=yes], [cc_cv_func_expect=no]) CFLAGS="$ac_save_CFLAGS" ]) AS_IF([test "x$cc_cv_func_expect" = "xyes"], [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1, [Define this if the compiler supports __builtin_expect() function]) $1], [$2]) ]) AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [ AC_REQUIRE([CC_CHECK_WERROR]) AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported], [cc_cv_attribute_aligned], [ac_save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $cc_cv_werror" for cc_attribute_align_try in 64 32 16 8 4 2; do AC_COMPILE_IFELSE([AC_LANG_SOURCE([ int main(void) { static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0; return c; }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break]) done CFLAGS="$ac_save_CFLAGS" ]) if test "x$cc_cv_attribute_aligned" != "x"; then AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned], [Define the highest alignment supported]) fi ])