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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:
Marc-André Lureau 2012-07-03 21:40:36 +02:00
parent 4b310b03e9
commit 8d9a9ca521
1 changed files with 8 additions and 1 deletions
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9
acinclude.m4
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@ -19,7 +19,7 @@ AC_DEFUN([VIRT_VIEWER_COMPILE_WARNINGS],[
warnCFLAGS=
try_compiler_flags="-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -fasynchronous-unwind-tables"
try_compiler_flags="-fexceptions -fstack-protector --param=ssp-buffer-size=4 -fasynchronous-unwind-tables"
case "$enable_compile_warnings" in
no)
@ -44,6 +44,13 @@ AC_DEFUN([VIRT_VIEWER_COMPILE_WARNINGS],[
;;
esac
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings. */
#if defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
compiler_flags=
for option in $try_compiler_flags; do
SAVE_CFLAGS="$CFLAGS"