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build: improve FORTIFY_SOURCE usage

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Based on this coreutils bug report, since coreutils copied what
libvirt had done:
https://lists.gnu.org/archive/html/bug-coreutils/2012-10/msg00121.html

* m4/virt-compile-warnings.m4 (LIBVIRT_COMPILE_WARNINGS): Allow
for user to pre-define _FORTIFY_SOURCE.
This commit is contained in:
Eric Blake 2012-10-23 14:00:32 -06:00
parent 2f3e2c0c43
commit cf9bced084
1 changed files with 1 additions and 1 deletions
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2
m4/virt-compile-warnings.m4
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@ -150,7 +150,7 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings,
without upsetting newer glibc. */
#if defined __OPTIMIZE__ && __OPTIMIZE__
#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])