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From: "soap at gentoo dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/108022] [11/12/13 regression] -frecord-gcc-switches
 doesn't record preprocessor macros since r11-5739-g7caa49706316e6
Date: Thu, 08 Dec 2022 15:05:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108022

David Seifert <soap at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |soap at gentoo dot org

--- Comment #4 from David Seifert <soap at gentoo dot org> ---
(In reply to Jakub Jelinek from comment #3)
> -frecord-gcc-switches is a totally useless option btw, just forget it exi=
sts
> and use -grecord-gcc-switches instead.

The problem is, the UX isn't exactly helpful. The only way I managed to ext=
ract
the macro definition was

gcc -ggdb3 -grecord-gcc-switches -D_TEST_SAVE_CPPFLAGS test.c -o ~/test &&
objdump -s -j .debug_str test | grep SAVE

which doesn't make our use case any easier really (since it requires heavy
debug flags).=