From: Alan Coopersmith <alan.coopersmith@sun.com>
Date: Sun, 17 Jan 2010 02:34:23 +0000 (-0800)
Subject: Check if gcc supports -fvisibility=hidden before adding to CFLAGS
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=adda7f3215a0f749751977cbbb6cef67f7163be5;p=mesa.git

Check if gcc supports -fvisibility=hidden before adding to CFLAGS

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
---

diff --git a/configure.ac b/configure.ac
index d01d0f18846..f121002d4be 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,7 +96,14 @@ esac
 
 dnl Add flags for gcc and g++
 if test "x$GCC" = xyes; then
-    CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -std=c99 -ffast-math -fvisibility=hidden"
+    CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -std=c99 -ffast-math"
+
+    # Enable -fvisibility=hidden if using a gcc that supports it
+    save_CFLAGS="$CFLAGS"
+    AC_MSG_CHECKING([whether $(CC) supports -fvisibility=hidden])
+    CFLAGS="$CFLAGS -fvisibility=hidden"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
+		   [CFLAGS="$save_CFLAGS" ; AC_MSG_RESULT([no])]);
 
     # Work around aliasing bugs - developers should comment this out
     CFLAGS="$CFLAGS -fno-strict-aliasing"