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From: "lhyatt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/69543] [10/11/12/13 Regression] _Pragma does not
 apply within macro
Date: Thu, 07 Jul 2022 14:05:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D69543

Lewis Hyatt <lhyatt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D97498
                 CC|                            |lhyatt at gcc dot gnu.org

--- Comment #20 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
See PR97498 which is closely related to this. It seems that the use of
input_location while handling diagnostic pragmas is problematic in other ca=
ses
besides the one discussed here (i.e. also when processing a diagnostic pop.)

Here is a test case from that PR, which breaks because of the input_location
workaround discussed here though:

=3D=3D=3D=3D=3D=3D
static void f() {} _Pragma("GCC diagnostic error \"-Wunused-function\"")
=3D=3D=3D=3D=3D=3D

The above errors for C but not C++, because in C, input_location points to =
the
start of the line and so it takes effect too early.=