[PATCH] powerpc:GCC(<10) doesn't allow -mlong-double-64 after -mabi=ieeelongdouble

[Florian Weimer]

* MAHESH BODAPATI:

> On 15/05/23 6:39 pm, Florian Weimer wrote:
>> * MAHESH BODAPATI via Libc-alpha:
>>
>>> From: Mahesh Bodapati <mahesh.bodapati@ibm.com>
>>>
>>> Removed -mabi=ieeelongdouble on failing tests. It resolves the error.
>>> error: ‘-mabi=ieeelongdouble’ requires ‘-mlong-double-128’
>> I think this is only need if GCC defaults to -mabi=ieeelongdouble, and
>> GCC 10 is not ready for that for different reasons?
>
> Yes,these tests are under "sysdeps/ieee754/ldbl-opt" and ieee754
> defaults to -mabi=ieeelongdouble and the
>
> CFLAGS were appended with -mlong-double-64 in commit
> dee2bea048b688b643a9a ,but powerpc gcc (<10)
>
> doesn't support mabi=ieeelongdouble with -mlong-double-64.the support
> has been addedin gcc 12.1 and
>
> it has been back-ported till gcc 10 so we are filtering out the
> -mabi=ieelongdouble to make it work

I think if you backport this stuff to GCC 10, you should also pick up
the commit that fixed GCC.  I believe its commit cb16bc3b5f34733ef9bb
("rs6000: Allow -mlong-double-64 after -mabi={ibm,ieee}longdouble
[PR104208, P R87496]").

Thanks,
Florian