autotools: use -fno-strict-aliasing where supported

https://bugzilla.gnome.org/show_bug.cgi?id=769183

diff --git a/configure.ac b/configure.ac
index fa93504..40ee2f7 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -268,6 +268,10 @@ VISIBILITY_CFLAGS=""
 AS_COMPILER_FLAG([-fvisibility=hidden], [VISIBILITY_CFLAGS="-fvisibility=hidden"])
 AC_SUBST(VISIBILITY_CFLAGS)
 
+dnl disable strict aliasing
+AS_COMPILER_FLAG([-fno-strict-aliasing], [EXTRA_CFLAGS="-fno-strict-aliasing"])
+AC_SUBST(EXTRA_CFLAGS)
+
 dnl every flag in GST_OPTION_CFLAGS can be overridden at make time
 GST_OPTION_CFLAGS="\$(WARNING_CFLAGS) \$(ERROR_CFLAGS) \$(DEBUG_CFLAGS) \$(PROFILE_CFLAGS) \$(GCOV_CFLAGS) \$(OPT_CFLAGS) \$(DEPRECATED_CFLAGS)"
 AC_SUBST(GST_OPTION_CFLAGS)
@@ -275,7 +279,7 @@ AC_SUBST(GST_OPTION_CFLAGS)
 dnl FIXME: do we want to rename to GST_ALL_* ?
 dnl prefer internal headers to already installed ones
 dnl add GST_OPTION_CFLAGS, but overridable
-GST_CFLAGS="$GST_CFLAGS \$(GST_STATIC_CFLAGS) \$(GST_OPTION_CFLAGS) \$(VISIBILITY_CFLAGS)"
+GST_CFLAGS="$GST_CFLAGS $EXTRA_CFLAGS \$(GST_STATIC_CFLAGS) \$(GST_OPTION_CFLAGS) \$(VISIBILITY_CFLAGS)"
 AC_SUBST(GST_CFLAGS)
 AC_SUBST(GST_LIBS)