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build: silence some compiler warnings from gnulib

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Gnulib claims that there are some classes of warnings that are
worth enabling during development, but where silencing those
warnings causes code bloat that is not necessary in an optimized
build.  The code bloat to silence the warnings is only enabled
by -Dlint.  Follow the lead of coreutils in setting up -Dlint
whenever full warnings are requested.

* m4/virt-compile-warnings.m4 (LIBVIRT_COMPILE_WARNINGS): Add
-Dlint, and move _FORTIFY_SOURCE to config.h instead of CFLAGS.
This commit is contained in:
Eric Blake 2012-01-12 14:14:44 -07:00
parent 927cfaf467
commit d940e3bdb9
1 changed files with 6 additions and 1 deletions
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m4/virt-compile-warnings.m4
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@ -100,8 +100,13 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
gl_WARN_ADD([-Wframe-larger-than=4096])
dnl gl_WARN_ADD([-Wframe-larger-than=256])
# 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])
# Extra special flags
gl_WARN_ADD([-Wp,-D_FORTIFY_SOURCE=2])
dnl -fstack-protector stuff passes gl_WARN_ADD with gcc
dnl on Mingw32, but fails when actually used
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