Add some more autoconf macros to filter our CFLAGS usage

Hopefully these new autoconf macros, with a little magic, will allow us to
compile with any compiler and still choose the options we have available
to us.

Tested locally with gcc 4.2.2 and gcc 3.4.6; the latter doesn't support two
of the items we previously had hardcoded in our CFLAGS.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index d93cea84..823d4691 100644
--- a/configure.ac
+++ b/configure.ac
@@ -162,6 +162,11 @@ AC_CHECK_FUNCS([realpath regcomp strcasecmp strdup strerror strnlen \
 # Enable large file support if available
 AC_SYS_LARGEFILE
 
+# Check if we can use symbol visibility support in GCC
+GCC_VISIBILITY_CC
+# Check if we have -fgnu89-inline flag
+GCC_GNU89_INLINE_CC
+
 # Host-dependant flags
 case "${host}" in
 	*-*-cygwin*)