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From: "dangelog at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/96416] to_address() is broken by static_assert in
 pointer_traits
Date: Wed, 21 Apr 2021 08:45:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96416

--- Comment #18 from Giuseppe D'Angelo <dangelog at gmail dot com> ---
Hello,

(In reply to Jonathan Wakely from comment #17)
> (In reply to Giuseppe D'Angelo from comment #14)
> > To summarize:
> >=20
> > * should a wording defect be raised against std::to_address(Ptr), to st=
ate
> > that pointer_traits<Ptr> being well-formed is actually a prerequisite?
>=20
> I'd prefer if pointer_traits was just SFINAE friendly.

I guess that's a reasonable thing to wish for, given I'm not the first fall=
ing
for it; I hope I'll be the last :)

> > * should LWG3446's resolution be amended?
>=20
> See https://cplusplus.github.io/LWG/issue3541
>=20
> > * if there's going to be a GCC 10.3, is the commit above solving LWG3446
> > going to be cherry-picked into it? Otherwise, either one blacklists GCC=
 10,
> > or has to specialize pointer_traits there as a workaround (?).
>=20
> It missed the 10.3 release, but it's on the gcc-10 branch as r10-9698, wh=
ich
> will be in GCC 10.4:
> https://gcc.gnu.org/g:32a859531e854382c18abf0b14a306d83f793eb5
> That also includes the fix for LWG 3541.

Thank you very much for the new issue and the cherry-pick of the fix.=