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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107461] [12/13 Regression] ambiguity error for friend with
 templated constexpr argument
Date: Sat, 04 Feb 2023 17:14:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107461

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Patrick Palka from comment #9)
> (In reply to Jakub Jelinek from comment #7)
> > Reduced testcase:
>=20
> Interestingly Clang also rejects this testcase, so I'm not sure if we were
> correct to accept it previously.

Note, the reduction was done purely with a test that it compiles without er=
rors
before your commit and with 1-3 errors "no matching function for call to" a=
fter
it.
Another thing is whether harfbuzz full source is valid or not, but that mig=
ht
be more difficult to find out because clang doesn't support the same
builtins/traits etc.=