[Patch][aarch64] Use IFUNCs to enable LSE instructions in libatomic on aarch64

[Szabolcs Nagy]

On 29/09/17 21:29, Steve Ellcey wrote:
> On Thu, 2017-09-28 at 12:31 +0100, Szabolcs Nagy wrote:
>>  
>> i think this should be improved, see below.
> 
> Those were all good suggestions, here is a new patch that incorporates
> the changes.  I fixed the IFUNC_OPTIONS argument,
> renamed ARCH_AARCH64_LINUX_LSE, got rid of the auxv references, and
> changed HWCAP_TYPE to IFUNC_RESOLVER_ARGS.
> 
> Here is the new patch, tested with no regressions.
> 

looks good to me, but i cannot approve.

(this will make libatomic depend on ifuncs on aarch64*-linux-gnu.)

> Steve Ellcey
> sellcey@cavium.com
> 
> 
> 2017-09-29  Steve Ellcey  <sellcey@cavium.com>
> 
> 	* Makefile.am (ARCH_AARCH64_LINUX): Add IFUNC_OPTIONS and
> 	libatomic_la_LIBADD.
> 	* config/linux/aarch64/host-config.h: New file.
> 	* configure.ac (IFUNC_RESOLVER_ARGS): Define.
> 	(ARCH_AARCH64_LINUX): New conditional for IFUNC builds.
> 	* configure.tgt (aarch64): Set ARCH and try_ifunc.
> 	(aarch64*-*-linux*) Update config_path.
> 	(aarch64*-*-linux*) Set IFUNC_RESOLVER_ARGS.
> 	* libatomic_i.h (GEN_SELECTOR): Add IFUNC_RESOLVER_ARGS argument.
> 	* Makefile.in: Regenerate.
> 	* auto-config.h.in: Regenerate.
> 	* configure: Regenerate.
>