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build: allow building with newer glibc-headers and -O0

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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.
This commit is contained in:
Christophe Fergeau 2012-06-07 17:23:05 +02:00
parent d55d7ee729
commit 331cba23cc
1 changed files with 6 additions and 2 deletions
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8
m4/spice-compile-warnings.m4
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@ -104,8 +104,12 @@ AC_DEFUN([SPICE_COMPILE_WARNINGS],[
gl_WARN_ADD([-Wframe-larger-than=9216])
# 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 defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
# Extra special flags
dnl -fstack-protector stuff passes gl_WARN_ADD with gcc