[llvm-bugs] [Bug 50006] New: -Wunknown-warning-option cannot be disabled via pragma

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50006

            Bug ID: 50006
           Summary: -Wunknown-warning-option cannot be disabled via pragma
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at behdad.org
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

[Broadly speaking, this is similar to
https://bugs.llvm.org/show_bug.cgi?id=25436]

In HarfBuzz we declare what warnings we want as error, as warning, and ignored,
in a C++ header file:

https://github.com/harfbuzz/harfbuzz/blob/ed2ee8a8c26dc39e39172c169d8a0d434083fefe/src/hb.hh#L37-L138

clang (tested with Apple clang 12) warns about unknown warning options:

warning: unknown warning option '-Wunsafe-loop-optimizations'
[-Wunknown-warning-option]
warning: unknown warning option '-Wlogical-op'; did you mean '-Wlong-long'?
[-Wunknown-warning-option]

However, we have this before adding other warning options:

#pragma GCC diagnostic ignored "-Wunknown-warning-option"

But clang seems to ignore it. Making that line say "clang" instead of "GCC"
doesn't make any difference.

If I pass -Wno-unknown-warning-option on the commandline it works. As pragma
doesn't.

Am I doing this wrong? Thanks.

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