From cfcc7c144879ebe61ac2472216314fc1331b4450 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Thu, 12 Nov 2015 11:29:49 -0500
Subject: [PATCH] configure: check for $cxx before use

I broke this when adding checks for clang++.

Reported-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1447345789-840-1-git-send-email-jsnow@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 configure | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 46fd8bdf8c..f75df4b68f 100755
--- a/configure
+++ b/configure
@@ -4435,7 +4435,8 @@ fi
 if test "$fortify_source" != "no"; then
   if echo | $cc -dM -E - | grep __clang__ > /dev/null 2>&1 ; then
     fortify_source="no";
-  elif echo | $cxx -dM -E - | grep __clang__ > /dev/null 2>&1 ; then
+  elif test -n "$cxx" &&
+       echo | $cxx -dM -E - | grep __clang__ >/dev/null 2>&1 ; then
     fortify_source="no";
   else
     fortify_source="yes"