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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/104568] [10/11/12 Regression] ICE [c++20] caused by option
 "-std=c++20 -Wall" when operand of operator new has size equal to 0
Date: Wed, 16 Feb 2022 18:29:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104568

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

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Make it
typedef int T[0];

constexpr bool
foo ()
{
  auto p =3D new T[0];
  delete p;
  return true;
}

constexpr bool a =3D foo ();
so that it is constant evaluated always, doesn't need -Wall then, just
-std=3Dc++20 or -std=3Dc++23.=