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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/91488] [9/10/11 Regression] char_traits::length
 causes "inlining failed in call to always_inline" error with -fgnu-tm -O2
 -std=c++17
Date: Mon, 16 Nov 2020 22:03:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91488

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to ensadc from comment #1)
> It seems that the inliner does not like the `static` specifier in
> `__constant_string_p`. This also triggers "inlining failed in call to
> always_inline" error:
>=20
> static __attribute__((always_inline)) constexpr bool
> f()
> {
>     return __builtin_is_constant_evaluated();
> }
>=20
> int main() {
>     (void)f();
> }

That 'static' causes ODR violations, so I think we need to get rid of it
anyway.=