On Wed, 11 Jun 2025, Uecker, Martin wrote:
> c: remaining fix for the composite type inconsistency [PR120510]
>
> There is an old GNU extension which allows overriding the
> promoted old-style arguments when there is an earlier prototype
> An example (from a test added for PR16666) is the following.
>
> float dremf (float, float);
>
> float
> dremf (x, y)
> float x, y;
> {
> return x + y;
> }
>
> The types of the two declarations are not compatible, because
> the arguments are not self-promoting. Add a special case
> to function_types_compatible_p that can be toggled via a flag
> for comptypes_internal and add a helper function to be able to
> add the checking assertions to composite_type.
>
> PR c/120510
>
> gcc/c/ChangeLog:
> * c-typeck.cc (composite_type_internal): Activate checking
> assertions for all types and also inputs.
> (comptypes_for_composite_check): New helper function.
> (function_types_compatible_p): Add exception.
>
> gcc/testsuite/ChangeLog:
> * gcc.dg/old-style-prom-4.c: New test.
OK.
--
Joseph S. Myers
josmy...@redhat.com
