SIGSTKSZ is now a run-time variable

[Carol Bouchard]

M4 Experts:

Since this issue seems to be in a standstill, I've put together a patch
that I can use locally.
I'm seeking input for this patch I've produced for m4 package.  I'd
appreciate your thoughts.
Carol

On Tue, Mar 16, 2021 at 3:46 PM Carol Bouchard <cbouchar@redhat.com> wrote:

> Folks:
>
> I misstated earlier that the latest Fedora is going in this direction.
> This appears to be a glibc only issue as my build is pulling in glibc and
> not playing nicely with m4.
> According to https://pkgs.org/download/glibc-devel, fedora rawhide is
> pulling in the latest version glibc-devel 2.33.
> I'm wondering if there is a short-term work-around I can use.
>
> Carol
>
> On Tue, Mar 9, 2021 at 4:30 PM Scott Lurndal <slurndal@sonic.net> wrote:
>
>> On Tue, Mar 09, 2021 at 08:58:38PM +0100, Bruno Haible via austin-group-l
>> at The Open Group wrote:
>> > Eric Blake wrote:
>> > > I can open a defect against POSIX if we decide that is needed, but
>> want
>> > > some consensus first on whether it is glibc's change that went too
>> far,
>> > > or POSIX's requirements that are too restrictive for what glibc wants
>> to do.
>> >
>> > Thanks for opening the discussion, Eric.
>> >
>> > Here are a couple of questions, to understand the motivation and the
>> possible
>> > alternative solutions to the problem:
>> >
>> > 1) As far as I understand, the issue occurs with certain x86 or x86_64
>> >    processors.
>> >
>> >    1.1) What has been the value of MINSIGSTKSZ on x86 and x86_64 so far?
>> >    1.2) What value of MINSIGSTKSZ is needed for AVX-512F support?
>> >    1.3) Will the trend to larger MINSIGSTKSZ values continue for Intel
>> >         processors?
>>
>> It's not just Intel processors.
>>
>> 64-bit ARM processors that support scalable vectors (SVE) support
>> vectors of up to 2084 bits, and they have 32 vector registers which would
>> require 8Kbytes for the SVE state alone if the implementation supports
>> the full 2kbits.
>>
>> scott
>>
>>
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