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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101557] the value of '<temporary>' is not usable in a
 constant expression
Date: Wed, 21 Jul 2021 15:24:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101557

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
clang++ rejects it similarly.
pr101557.C:40:16: error: constexpr variable 'size3' must be initialized by a
constant expression
constexpr auto size3 =3D mysize(a);
               ^       ~~~~~~~~~
pr101557.C:22:45: note: read of temporary is not allowed in a constant
expression outside the expression that created the temporary
Wonder if this isn't related to the recently posted PR100976 patch.=