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From: "tom at honermann dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106423] New: -Wc++20-compat diagnostics not suppressed by
 #pragma GCC diagnostic ignored
Date: Sun, 24 Jul 2022 03:32:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106423

            Bug ID: 106423
           Summary: -Wc++20-compat diagnostics not suppressed by #pragma
                    GCC diagnostic ignored
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tom at honermann dot net
  Target Milestone: ---

As demonstrated at https://godbolt.org/z/GoTqPTcM3, use of gcc's '#pragma G=
CC
diagnostic ignored "-Wc++20-compat"' directive fails to suppress -Wc++20-co=
mpat
enabled diagnostics. gcc versions 10 and up are affected.

$ cat t.cpp
#pragma GCC diagnostic ignored "-Wc++20-compat"
int constinit;

$ gcc -c -std=3Dc++17 -Wc++20-compat t.cpp
t.cpp:2:5: warning: identifier =E2=80=98constinit=E2=80=99 is a keyword in =
C++20
[-Wc++20-compat]
    2 | int constinit;
      |     ^~~~~~~~~=