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 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 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
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.
-AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
- AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),
- [ac_save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS $1"
- AC_COMPILE_IFELSE([int a;],
- [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
- [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
- CFLAGS="$ac_save_CFLAGS"
- ])
+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])
- AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
- [$2], [$3])
-])
+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'"])
-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_$2_$3])[ = xyes],
+ [eval "$1='${$1} $3'"])
+])
- AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
- [$2], [$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]),
[$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
AS_TR_SH([cc_cv_attribute_$1]),
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
- AC_COMPILE_IFELSE([$3],
+ 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"
[cc_flag_visibility_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
- cc_cv_flag_visibility='yes',
- cc_cv_flag_visibility='no')
+ cc_cv_flag_visibility='yes',
+ cc_cv_flag_visibility='no')
CFLAGS="$cc_flag_visibility_save_CFLAGS"])
-
+
AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
[AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
[Define this if the compiler supports the -fvisibility flag])
[cc_cv_func_expect],
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
- AC_COMPILE_IFELSE(
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[int some_function() {
int a = 3;
return (int)__builtin_expect(a, 3);
- }],
+ }])],
[cc_cv_func_expect=yes],
[cc_cv_func_expect=no])
CFLAGS="$ac_save_CFLAGS"
[ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $cc_cv_werror"
for cc_attribute_align_try in 64 32 16 8 4 2; do
- AC_COMPILE_IFELSE([
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([
int main() {
static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
return c;
- }], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
+ }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
done
CFLAGS="$ac_save_CFLAGS"
])
~ianmdlvl / elogind.git / blobdiff