From 0584101e15539dc022db27bba801e5d6e8d4679b Mon Sep 17 00:00:00 2001
From: Panu Matilainen <pmatilai@redhat.com>
Date: Thu, 8 Dec 2016 10:07:09 +0200
Subject: Unbreak gcc options checking

Commit c810a0aca3f1148d2072d44b91b8cc9caeb4cf19 changed the gcc flag
test to include a call to alloca() which at least on GCC 6.2 just
causes all the tests to fail with implicit declaration warnings
which are errors since we test with -Werror. Include <alloca.h>
to avoid the warnings and thus make the test functional again.
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2eaf97ed5..0e5188646 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,8 @@ if test "$GCC" = yes; then
     echo
     for flag in $cflags_to_try; do
         CFLAGS="$CFLAGS $flag -Werror"
-        AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[alloca(100);]])],[
+        AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[#include <alloca.h>
+						alloca(100);]])],[
                 echo "   $flag"
                 RPMCFLAGS="$RPMCFLAGS $flag"
         ],[])
-- 
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