[Bug c++/115670] auto placeholder for return type should change the linkage of the function if the type becomes local linkage too

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115670

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> So at -O1, foo0, foo5, foo6 are the only ones left.
> 
> at -O0, foo1, foo2, foo3, foo4 are also emitted but that is expected since
> GCC emits static unused functions always at -O0.
> 
> 
> So let's keep this for foo0/foo5. I will file one for foo6 in a second.

Note if the definition of the anonymous namespace is in a header, then GCC does
warn for s2 (not for foo6 though).