From: Eric Blake Date: Mon, 4 Jun 2012 17:33:20 +0000 (-0600) Subject: build: allow building with newer glibc-headers and -O0 X-Git-Tag: v0.9.13-rc1~148 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2af63b1c349114df98c163a8401fd9cf2facdabe;p=thirdparty%2Flibvirt.git build: allow building with newer glibc-headers and -O0 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. --- diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4 index 5527bff501..a91d69f463 100644 --- a/m4/virt-compile-warnings.m4 +++ b/m4/virt-compile-warnings.m4 @@ -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