[Bug c++/100596] [12 Regression] error: attribute appertains to a friend declaration that is not a definition since r12-786-g149061188c7c6ddf

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100596

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Rejecting such code was the point of the patch.  I guess we'll have to either
downgrade to a warning or just not complain about GNU attributes at all.