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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105826] New: failure to compile namespace-scope constexpr
 new-expression
Date: Thu, 02 Jun 2022 20:12:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105826

            Bug ID: 105826
           Summary: failure to compile namespace-scope constexpr
                    new-expression
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

As discussed in
<https://gcc.gnu.org/pipermail/gcc-patches/2022-June/596134.html>, this sho=
uld
compile in C++20:

struct A
{
  int i;
  constexpr A(int *p): i(*p) { delete p; }
};

constexpr int i =3D A(new int(42)).i;

but currently we issue

$ ./cc1plus -quiet q.C -std=3Dc++20
q.C:7:34: error: the value of =E2=80=98<anonymous>=E2=80=99 is not usable i=
n a constant
expression
    7 | constexpr int i =3D A(new int(42)).i;
      |                                  ^
q.C:7:31: note: =E2=80=98<anonymous>=E2=80=99 was not declared =E2=80=98con=
stexpr=E2=80=99
    7 | constexpr int i =3D A(new int(42)).i;
      |                               ^=