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-dnl Macros to check the presence of generic (non-typed) symbols.
-dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes@gmail.com>
-dnl Copyright (c) 2006-2008 xine project
-dnl Copyright (c) 2012 Lucas De Marchi <lucas.de.marchi@gmail.com>
-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 FLAG in ENV-VAR is supported by compiler and append it
-dnl to WHERE-TO-APPEND variable. Note that we invert -Wno-* checks to
-dnl -W* as gcc cannot test for negated warnings.
-dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
-
-AC_DEFUN([CC_CHECK_FLAG_APPEND], [
- AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
- AS_TR_SH([cc_cv_$2_$3]),
- [eval "AS_TR_SH([cc_save_$2])='${$2}'"
- eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'"
- AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; } ])],
- [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
- [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
- eval "AS_TR_SH([$2])='$cc_save_$2'"])
-
- AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
- [eval "$1='${$1} $3'"])
-])
-
-dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
-AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
- for flag in [$3]; do
- CC_CHECK_FLAG_APPEND([$1], [$2], $flag)
- 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([int main() { 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 $host in
- dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
- dnl are requested, as different implementations are present; to avoid problems
- dnl use -Wl,-z,defs only for those platform not behaving this way.
- *-freebsd* | *-openbsd*) ;;
- *)
- dnl First of all check for the --no-undefined variant of GNU ld. This allows
- dnl for a much more readable command line, so that people can understand what
- dnl it does without going to look for what the heck -z defs does.
- for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
- CC_CHECK_LDFLAGS([$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],,
- [void __attribute__((constructor)) ctor() { int a; }],
- [$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() { }],
- [$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));],
- [$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 $cc_cv_werror"
- for cc_attribute_align_try in 64 32 16 8 4 2; do
- AC_COMPILE_IFELSE([AC_LANG_SOURCE([
- int main() {
- static char c __attribute__ ((aligned($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
-])
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