[PATCH] ISL, MPC, MPFR: fix configuration issues on ARM64/Darwin host

[Cedric Berger]

On 13.05.22 16:25, Joel Sherrill wrote:
> On Fri, May 13, 2022, 9:08 AM Karel Gardas <karel at functional.vision> wrote:
>
>> Joel,
>>
>> I agree that having support upstreamed would be the best option. Due to
>> upstream lag behind apple hardware development I'm afraid we would miss
>> RTEMS 6 release if we would wait on upstream here, hence apple M1 users
>> would not be able to use RTEMS 6.
>>
> Submitting them and then referencing the upstream email, git commit, or
> attachment to their ticket.  We don't wait for upstream releases.

The fixes here are just patches for the autoconf "config.sub" files of 
these 3 projects.

The problem with these projets (isl/mpc/mfpr) is that they have not had 
any releases for 2+ years, before the M1.

#find build . -name config.sub | xargs grep '^timestamp='

[...]mpfr-4.1.0/config.sub:timestamp='2018-02-22'
[...]isl-0.24/config.sub:timestamp='2018-02-22'
[...]mpc-1.2.1/build-aux/config.sub:timestamp='2020-01-01'

The other projects in the tree using autoconf that have been released in 
2021+ compile fine on the M1.

The 3 projects in questions have nothing special to do to get M1 support 
except release a new version with up-to-date autoconf stuff.

Cedric