[ping] allow target (OS) SUBTARGET_OVERRIDE_OPTIONS on aarch64

[James Greenhalgh]

On Wed, Dec 12, 2018 at 09:42:05AM -0600, Olivier Hainque wrote:
> Ping for one of the changes last proposed here:
> 
>  https://gcc.gnu.org/ml/gcc-patches/2018-11/msg00761.html
> 
> Submitted separately as an attempt to facilitate the review
> process.
> 
> This one proposes the possibility for target (OS) configurations
> to provide a SUBTARGET_OVERRIDE_OPTIONS macro as other CPU ports
> do, needed by our aarch64-vxworks7 port to come.
> 
> Got access to a linux box, so in addition to the Ada nighty
> testing we do on the cross port, bootstrapped and regression
> tested on aarch64-linux.
> 
> OK to commit ?

OK.

Thanks,
James

> 2018-12-12  Olivier Hainque  <hainque@adacore.com>
> 
> 	* config/aarch64/aarch64.c (aarch64_override_options): Once arch,
> 	cpu and tune were validated, insert SUBTARGET_OVERRIDE_OPTIONS if
> 	defined.