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Subject: [Bug c++/106223] difference in behaviour between no optimization and
 -O for specialization of std::forward
Date: Thu, 07 Jul 2022 09:58:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106223

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Nimrod from comment #2)
> Quoted from https://timsong-cpp.github.io/cppwp/n4659/namespace.std#2
>=20
> "A program may explicitly instantiate a template defined in the standard
> library only if the declaration depends on the name of a user-defined type
> and the instantiation meets the standard library requirements for the
> original template."

That paragraph has nothing to do with your case, you are adding a
specialization, not an explicit instantiation.

If the standard allows this nonsense then it needs to be fixed. std::move a=
nd
std::forward are effectively built-in language primitives, and you should n=
ot
be messing with them.=