configure: Enable -fvisibility=hidden for g++ as well
diff --git a/configure.ac b/configure.ac
index a7ee0f5..bf8feb6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -155,6 +155,13 @@
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