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From: "steve_green at qq dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96330] New: Constexpr variables cannot be used in the
 template context.
Date: Mon, 27 Jul 2020 11:55:47 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 10.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96330

            Bug ID: 96330
           Summary: Constexpr variables cannot be used in the template
                    context.
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: steve_green at qq dot com
  Target Milestone: ---

demo code:
struct foo_t {
    template<class T>
        static constexpr bool bar =3D true;
};
inline constexpr foo_t foo{};

template<class T>
    struct baz {
        static_assert(foo.bar<T>); // bug in clang (before instantiation) a=
nd
gcc (during instantiation)
        static_assert(foo_t::bar<T>); // OK
    };

int main()
{
    static_assert(foo.bar<void>, ""); // OK
    static_assert(foo_t::bar<void>, ""); // OK
    static_cast<void>(baz<void>{});
}=