On Tue, Jan 29, 2013 at 10:39:08AM +0100, Michal Privoznik wrote: > If the _FORTIFY_SOURCE has been already defined, we unconditionally > redefine it, leaving us with warning/error thrown at compilation time. > --- > m4/virt-compile-warnings.m4 | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4 > index cdcbad9..894ab59 100644 > --- a/m4/virt-compile-warnings.m4 > +++ b/m4/virt-compile-warnings.m4 > @@ -84,8 +84,13 @@ AC_DEFUN([LIBVIRT_SANDBOX_COMPILE_WARNINGS],[ > gl_WARN_ADD([-Wframe-larger-than=4096]) > > # Use improved glibc headers > - AC_DEFINE([_FORTIFY_SOURCE], [2], > - [enable compile-time and run-time bounds-checking, and some warnings]) > + AH_VERBATIM([FORTIFY_SOURCE], > + [/* Enable compile-time and run-time bounds-checking, and some warnings, > + without upsetting newer glibc. */ > + #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ > + # define _FORTIFY_SOURCE 2 > + #endif > + ]) > > # Extra special flags > dnl -fstack-protector stuff passes gl_WARN_ADD with gcc ACK Daniel