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From: "tobi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/100891] New: #pragma GCC diagnostic ignored
Date: Thu, 03 Jun 2021 09:46:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100891

            Bug ID: 100891
           Summary: #pragma GCC diagnostic ignored
           Product: gcc
           Version: 10.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tobi at gcc dot gnu.org
  Target Milestone: ---

$ cat t.cpp
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmultichar"

// Check that I'm disabling warnings correctly: the following warnings
disappear correctly:
#pragma GCC diagnostic ignored "-Wnarrowing"
#pragma GCC diagnostic ignored "-Woverflow"
#endif
            constexpr int native{ 'ABCD' };
            constexpr short i{123456}; // crosscheck
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
$ g++ -Wall -c t.cpp
t.cpp:8:35: warning: multi-character character constant [-Wmultichar]
             constexpr int native{ 'ABCD' };
                                   ^~~~~~
$

Compiler explorer link here: https://godbolt.org/z/P5cjqKs4a

Verified with all versions on the compiler explorer back to 6.2.=