[virt-tools-list] [PATCH virt-viewer 01/19] build: allow building with newer glibc-headers and -O0

[Christophe Fergeau]

Looks good, ACK

Christophe

On Mon, Jul 16, 2012 at 06:57:36PM +0200, Marc-André Lureau wrote:
>     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.
> ---
>  acinclude.m4 |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/acinclude.m4 b/acinclude.m4
> index 73b5a7b..0c308bc 100644
> --- a/acinclude.m4
> +++ b/acinclude.m4
> @@ -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"
> -- 
> 1.7.10.4
> 
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