[Qemu-trivial] [PATCH] configure: Undefine _FORTIFY_SOURCE prior using it

[Michal Privoznik]

Currently, we are enforcing the _FORTIFY_SOURCE=2 without any
previous detection if the macro has been already defined, e.g.
by environment, or is just enabled by compiler by default.

Signed-off-by: Michal Privoznik <address@hidden>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index b7635e4..97070eb 100755
--- a/configure
+++ b/configure
@@ -3159,7 +3159,7 @@ if test "$gcov" = "yes" ; then
   CFLAGS="-fprofile-arcs -ftest-coverage -g $CFLAGS"
   LDFLAGS="-fprofile-arcs -ftest-coverage $LDFLAGS"
 elif test "$debug" = "no" ; then
-  CFLAGS="-O2 -D_FORTIFY_SOURCE=2 $CFLAGS"
+  CFLAGS="-O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 $CFLAGS"
 fi
 
 
-- 
1.8.0.2