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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94753] -undef, c++20 and feature-test macros
Date: Sat, 13 Apr 2024 23:29:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94753

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I am going to fix this for GCC 15.

The check for -undef is done way to early it seems in c_cpp_builtins .
Basically the code to define the feature macros need to be moved to before =
that
check.

The reason why __cplusplus works is because that is done via libcpp rather =
than
from the front-end.=