From f2788a5543f72cdbe5fafd95ea7b37fab06745e3 Mon Sep 17 00:00:00 2001
From: Ben Fuhrmannek
Date: Fri, 4 Mar 2016 21:39:12 +0100
Subject: use C11 if available, otherwise try C99 (closes #7)

---
 config.m4 | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/config.m4 b/config.m4
index f73dfe8..9cb8969 100644
--- a/config.m4
+++ b/config.m4
@@ -27,4 +27,20 @@ if test "$PHP_SUHOSIN7_DEBUG" != "no"; then
 	AC_DEFINE(SUHOSIN7_DEBUG, 1, [Whether to enable suhosin7 debugging])
 fi
 
-CFLAGS="$CFLAGS -std=c11"
+AC_MSG_CHECKING([for C11 support with -std=c11])
+old_CFLAGS="$CFLAGS"
+CFLAGS+=" -std=c11"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[AC_MSG_RESULT([yes])],[
+	AC_MSG_RESULT([no])
+	CFLAGS="$old_CFLAGS"
+	echo "===== WARNING ============================================"
+	echo "  Suhosin7 is written in C11, but your compiler lacks C11"
+	echo "  support. Trying C99 instead, but compiling may fail."
+	echo "=========================================================="
+	AC_MSG_CHECKING([for C99 support with -std=c99])
+	CFLAGS+=" -std=c99"
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],[AC_MSG_RESULT([yes])],[
+		AC_MSG_RESULT([no])
+		CFLAGS="$old_CFLAGS"
+	])
+])
-- 
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