[PATCH v1 00/35] Require GNU C --at least GCC 5 or Clang 4-- in headers

[Florian Weimer]

* Alejandro Colomar:

> Hi Florian,
>
> On Mon, Nov 10, 2025 at 07:06:00AM +0100, Florian Weimer wrote:
>> * Alejandro Colomar:
>> 
>> > Alejandro Colomar (35):
>> >   Assume __GNUC__
>> >   Assume __GNUC__ >= 2
>> >   Assume __GNUC__ >= 3
>> >   Assume __GNUC__ >= 4
>> 
>> No, this breaks some versions of Oracle Pro*C, tools based on CKit (such
>> as mlnlffigen), and many other things.
>
> Thanks!  Is it because of 'Assume __GNUC__'?  Or because one of the
> version bumps?  Could we assume a higher __GNUC__ but keep allowing
> non-__GNUC__?

I don't know.  Changing <sys/cdefs.h> is probably not advised because
it's shared with gnulib.  Support for GCC 1 can probably be removed from
the other headers, but the cleanup opportunities seem rather minimal.

Thanks,
Florian