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 d01d0f1..f121002 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,7 +96,14 @@
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"