mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-27 14:15:34 +07:00
eb2e280f9c
Set a separate variable for adding warning flags. Build systems are not supposed to change CFLAGS and LDFLAGS, these are user variables. Reference: http://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html
289 lines
9.6 KiB
Plaintext
289 lines
9.6 KiB
Plaintext
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
|
|
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])='$3'"
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
|
|
[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 $host in
|
|
dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
|
|
dnl are requested, as different implementations are present; to avoid problems
|
|
dnl use -Wl,-z,defs only for those platform not behaving this way.
|
|
*-freebsd* | *-openbsd*) ;;
|
|
*)
|
|
dnl First of all check for the --no-undefined variant of GNU ld. This allows
|
|
dnl for a much more readable commandline, so that people can understand what
|
|
dnl it does without going to look for what the heck -z defs does.
|
|
for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
|
|
CC_CHECK_LDFLAGS([$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],,
|
|
[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
|
|
])
|