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From 5bbe8b009d6daa809f679fd1d25c270abba468b4 Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Wed, 31 Jan 2018 17:52:39 +0100
Subject: [PATCH] Verify flags prior to adding them to CFLAGS, not after
---
configure.ac | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index b7b5908..4084965 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,8 +8,11 @@ m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
[AC_GNU_SOURCE])
AC_PROG_CC_C99
+
for flag in -Wall -Wextra; do
- AC_TRY_COMPILE([], [return 0;], [CFLAGS="$CFLAGS $flag"],)
+ OLD_CFLAGS=$CFLAGS
+ CFLAGS="$CFLAGS $flag"
+ AC_TRY_COMPILE(, [return 0;], [], [CFLAGS=$OLD_CFLAGS])
done
AC_CANONICAL_SYSTEM
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