Mesa (master): configure: Enable -fvisibility=hidden for g++ as well

[Kristian Høgsberg]

Module: Mesa
Branch: master
Commit: 7b34fcc4874671dc92413fa1a091eafac4191cee
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b34fcc4874671dc92413fa1a091eafac4191cee

Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Wed Sep  8 20:34:07 2010 -0400

configure: Enable -fvisibility=hidden for g++ as well

---

 configure.ac |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index a7ee0f5..bf8feb6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -155,6 +155,13 @@ fi
 if test "x$GXX" = xyes; then
     CXXFLAGS="$CXXFLAGS -Wall"
 
+    # Enable -fvisibility=hidden if using a gcc that supports it
+    save_CXXFLAGS="$CXXFLAGS"
+    AC_MSG_CHECKING([whether $CXX supports -fvisibility=hidden])
+    CXXFLAGS="$CXXFLAGS -fvisibility=hidden"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
+		   [CXXFLAGS="$save_CXXFLAGS" ; AC_MSG_RESULT([no])]);
+
     # Work around aliasing bugs - developers should comment this out
     CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
 fi