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]
cc1: all warnings being treated as errors
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.
---
m4/spice-compile-warnings.m4 | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
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],[
gl_WARN_ADD([-Wframe-larger-than=20460])
# 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. */
+#if __OPTIMIZE__
+# define _FORTIFY_SOURCE 2
+#endif
+])
# Extra special flags
dnl -fstack-protector stuff passes gl_WARN_ADD with gcc
--
1.7.10.1
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