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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107939] [11/12/13 Regression] Rejects use of `extern const`
 variable in a template since r11-557
Date: Thu, 02 Mar 2023 22:48:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107939

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
A similar example

extern const int z;
template<int> constexpr auto p =3D z;

works, because require_constant_expression is OK with 'z' here.  The differ=
ence
between 'z' here and 'q' in the previous test is
INTEGRAL_OR_ENUMERATION_TYPE_P, which makes decl_maybe_constant_var_p return
different answers:

  else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
           && INTEGRAL_OR_ENUMERATION_TYPE_P (type))
    /* And const integers.  */;=