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

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glibc 2.15 (on Fedora 17) coupled with explicit disabling of
optimization during development dies a painful death:

In file included from /usr/include/limits.h:27:0,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/include/limits.h:169,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/include/syslimits.h:7,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/include/limits.h:34,
                 from util/bitmap.c:26:
/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/virt-compile-warnings.m4 (LIBVIRT_COMPILE_WARNINGS): Squelch
_FORTIFY_SOURCE when needed to avoid glibc #warnings.
(cherry picked from commit 2af63b1c34)
This commit is contained in:
Eric Blake 2012-06-04 11:33:20 -06:00 committed by Cole Robinson
parent 2a75b756d0
commit f6e7865d27
1 changed files with 6 additions and 2 deletions
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8
m4/virt-compile-warnings.m4
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@ -102,8 +102,12 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
# Silence certain warnings in gnulib, and use improved glibc headers
AC_DEFINE([lint], [1],
[Define to 1 if the compiler is checking for lint.])
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