[Spice-commits] m4/spice-compile-warnings.m4

Alon Levy alon at kemper.freedesktop.org
Wed Jun 6 07:32:15 PDT 2012

 m4/spice-compile-warnings.m4 |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

New commits:
commit d905a1f24c93e99812388f6def42f8285c2acc6c
Author: Alon Levy <alevy at redhat.com>
Date:   Wed Jun 6 16:03:53 2012 +0300

    m4/spice-compile-warnings: Squelch _FORTIFY_SOURCE when needed to avoid glibc #warnings.
    Fix copied from libvirt, commit by Eric Blake.
    glibc 2.15 (on Fedora 17) coupled with explicit disabling of
    optimization during development dies a painful death:
    /usr/include/features.h:314:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
    Work around this by only conditionally defining _FORTIFY_SOURCE,
    in the case where glibc can actually use it.  The trick is using
    AH_VERBATIM instead of AC_DEFINE.

diff --git a/m4/spice-compile-warnings.m4 b/m4/spice-compile-warnings.m4
index 601ecf8..959971a 100644
--- a/m4/spice-compile-warnings.m4
+++ b/m4/spice-compile-warnings.m4
@@ -111,8 +111,12 @@ AC_DEFUN([SPICE_COMPILE_WARNINGS],[
     # Use improved glibc headers
-      [enable compile-time and run-time bounds-checking, and some warnings])
+    [/* Enable compile-time and run-time bounds-checking, and some warnings. */
+#if __OPTIMIZE__
+# define _FORTIFY_SOURCE 2
     # Extra special flags
     dnl -fstack-protector stuff passes gl_WARN_ADD with gcc

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