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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/88174] Make __real__ += __val usable in constexpr context.
Date: Wed, 08 Jun 2022 15:37:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88174

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jakub at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 53104
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53104&action=3Dedit
gcc13-pr88174.patch

Untested fix.

Also fixes e.g.:
#include <complex>

constexpr bool
foo ()
{
  std::complex<double> a (1.0, 2.0);
  a +=3D 3.0;
  a.real (6.0);
  return a.real () =3D=3D 6.0 && a.imag () =3D=3D 2.0;
}

static_assert (foo ());

with -std=3Dc++20 which failed before.=