bug#65727: bug#63365: bug#65727: 30.0.50; Build failure in MSYS2 when --with-native-compilation

[Andrea Corallo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <acorallo@gnu.org>
>> Cc: "63365@debbugs.gnu.org" <63365@debbugs.gnu.org>,  "eliz@gnu.org"
>>  <eliz@gnu.org>,  65727@debbugs.gnu.org,  Arash Esbati <arash@gnu.org>,
>>   András Svraka <svraka.andras@gmail.com>
>> Date: Fri, 17 May 2024 08:06:56 -0400
>> 
>> I believe this is a GCC bug as the sibling call optimizer should not run
>> in functions making use of 'builtin_unwind_init', even if this one is
>> undocumented (otherwise I can't see its reason of being 🙂).
>> 
>> So I filed a GCC bug [1].
>> 
>> Despite the fact that this will or not be recognized as a bug (and in
>> case fixed), I think we'll have to fix this on our codebase disabling
>> the sibling call optimizations on the sentive function(s).
>
> Agreed.  Can you install a patch along these lines?

Work in progress 👍

> Do we have other functions that could be sensitive to this issue?

All functions calling 'flush_stack_call_func' are impacted, but I think
I've a fix that touches only 'flush_stack_call_func'.

  Andrea