From 5252a9ad51a480a8b070473b5dffeeaf4c64514c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20=27Flameeyes=27=20Petten=C3=B2?=
 <flameeyes@gmail.com>
Date: Thu, 22 May 2008 17:32:18 +0200
Subject: Create a backend macro CC_CHECK_FLAGS_SILENT for specific flag
 macros, and use it for checking -fvisibility=hidden.

--HG--
extra : transplant_source : %7B%9AW%E8%B4u%06%18%E4%25K%80d%CF%B2z%EA%0C%ECA
---
 m4/attributes.m4 | 56 +++++++++++++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 25 deletions(-)

(limited to 'm4')

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index 56cdd51d1..2b7175b1c 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -32,9 +32,8 @@ 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], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_cflags_$1]),
+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;],
@@ -50,6 +49,19 @@ AC_DEFUN([CC_CHECK_CFLAGS], [
   fi
 ])
 
+AC_DEFUN([CC_CHECK_CFLAGS], [
+  AC_CACHE_CHECK([if $CC supports $1 flag],
+    AS_TR_SH([cc_cv_cflags_$1]),
+    CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
+  )
+
+  if eval test [x$]AS_TR_SH([cc_cv_cflags_$1]) = xyes; then
+    ifelse([$2], , [:], [$2])
+  else
+    ifelse([$3], , [:], [$3])
+  fi
+])
+
 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
@@ -175,28 +187,22 @@ AC_DEFUN([CC_ATTRIBUTE_PACKED], [
 ])
 
 AC_DEFUN([CC_FLAG_VISIBILITY], [
-	AC_REQUIRE([CC_CHECK_WERROR])
-	ac_save_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS $cc_cv_werror"
-	AC_CACHE_CHECK([if compiler supports -fvisibility=hidden],
-		[cc_cv_flag_visibility],
-		[
-		save_CFLAGS=$CFLAGS
-		CFLAGS="$CFLAGS -fvisibility=hidden"
-		AC_COMPILE_IFELSE([int a;],
-			[cc_cv_flag_visibility=yes],
-			[cc_cv_flag_visibility=no])
-		CFLAGS="$save_CFLAGS"
-		])
-	CFLAGS="$ac_save_CFLAGS"
-	
-	if test "x$cc_cv_flag_visibility" = "xyes"; then
-		AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1, [Define this if the compiler supports the -fvisibility flag])
-		$1
-	else
-		true
-		$2
-	fi
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
+    [cc_cv_flag_visibility],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
+	cc_cv_flag_visibility='yes',
+	cc_cv_flag_visibility='no')
+     CFLAGS="$ac_save_CFLAGS"])
+  
+  if test "x$cc_cv_flag_visibility" = "xyes"; then
+    AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1, [Define this if the compiler supports the -fvisibility flag])
+    ifelse([$1], , [:], [$1])
+  else
+    ifelse([$2], , [:], [$2])
+  fi
 ])
 
 AC_DEFUN([CC_FUNC_EXPECT], [
-- 
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