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m4: fix CC_CHECK_WERROR and CC_FLAG_VISIBILITY macros

Browse source 
These macros come from systemd, but CC_CHECK_CFLAGS_SILENT was removed in
systemd commit eb2e280f9c59b66965c9316eadc4c113a13ca744, breaking some of
them.

CC_FLAG_VISIBILITY doesn't need to require CC_CHECK_WERROR because
CC_CHECK_FLAG_APPEND always append -Werror anyway. Which kinda brings into
question why we have CC_CHECK_WERROR in the first place, but whavever.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2014-05-15 09:52:14 +10:00
parent 4e7863eee1
commit a5a1042312
1 changed files with 6 additions and 11 deletions
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17
m4/attributes.m4
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@ -109,13 +109,14 @@ dnl
dnl Other compilers don't support -Werror per se, but they support
dnl an equivalent flag:
dnl - Sun Studio compiler supports -errwarn=%all
dnl we don't test for that, it gives us false positives when gcc doesn't
dnl actually complain about it. If someone wants to compile this on sun, let
dnl them fix it.
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])])
])
[CC_CHECK_FLAG_APPEND([cc_cv_werror], [CFLAGS], [-Werror])])
])
AC_DEFUN([CC_CHECK_ATTRIBUTE], [
@ -225,17 +226,11 @@ AC_DEFUN([CC_ATTRIBUTE_CONST], [
])
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"])
[CC_CHECK_FLAG_APPEND([cc_cv_flag_visibility], [CFLAGS], [-fvisibility=hidden])])
AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
AS_IF([test "x$cc_cv_flag_visibility" != "x"],
[AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
[Define this if the compiler supports the -fvisibility flag])
$1],