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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Wunknown-warning-option cannot be disabled via pragma"
href="https://bugs.llvm.org/show_bug.cgi?id=50006">50006</a>
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<th>Summary</th>
<td>-Wunknown-warning-option cannot be disabled via pragma
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm@behdad.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>[Broadly speaking, this is similar to
<a class="bz_bug_link
bz_status_CONFIRMED "
title="CONFIRMED - clang -Wunknown-pragmas shouldn't warn about a '#pragma GCC diagnostic' it doesn't know"
href="show_bug.cgi?id=25436">https://bugs.llvm.org/show_bug.cgi?id=25436</a>]
In HarfBuzz we declare what warnings we want as error, as warning, and ignored,
in a C++ header file:
<a href="https://github.com/harfbuzz/harfbuzz/blob/ed2ee8a8c26dc39e39172c169d8a0d434083fefe/src/hb.hh#L37-L138">https://github.com/harfbuzz/harfbuzz/blob/ed2ee8a8c26dc39e39172c169d8a0d434083fefe/src/hb.hh#L37-L138</a>
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.</pre>
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