[libvirt] [PATCH] build: silence ar warnings on rawhide

[Daniel P. Berrange]

On Tue, Jun 02, 2015 at 09:24:26AM -0600, Eric Blake wrote:
> Newer binutils 'ar' has added an option 'D' for deterministic
> builds, and at least on rawhide, this option is enabled by default.
> But it conflicts with the 'u' optimization where the linker only
> modifies libraries based on file timestamps, but can result in
> different library ordering based on which files were touched last.
> Thus, it results in some noisy compilation, for every CCLD line:
> 
>   CCLD     libvirt_driver_qemu_impl.la
>   ar: `u' modifier ignored since `D' is the default (see `U')
> 
> Upstream automake has decided that defaulting ARFLAGS to 'cru' is
> no longer beneficial, and that switching the default to 'cr' will
> both silence the noise and not penalize modern build systems.
> 
> https://lists.gnu.org/archive/html/automake-patches/2015-06/msg00000.html
> 
> But rather than wait for newer automake to propagate to all systems
> that already have newer binutils, we might as well just use the new
> default ourselves, even on older platforms.
> 
> Signed-off-by: Eric Blake <eblake at redhat.com>
> ---
> 
> This is bugging me even more now that Fedora 22 also suffers from
> the same issue (we've been ignoring it in rawhide for several months
> now).  While it seems trivial, I'd like a review before pushing.
> 
>  configure.ac | 4 ++++
>  1 file changed, 4 insertions(+)

ACK


Regards,
Daniel
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