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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - False positives for -Wunused-but-set-variable with op assignment operators (e.g. `|=`)"
href="https://bugs.llvm.org/show_bug.cgi?id=51849">51849</a>
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<th>Summary</th>
<td>False positives for -Wunused-but-set-variable with op assignment operators (e.g. `|=`)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>luismarques@lowrisc.org
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>I think this is a false positive.
This happens with trunk (9aeecdfa8e91) and the latest RC (13.0.0-rc3):
$ cat test.c
void f(void) {
int result = 0;
#ifdef BUG
result |= 42;
#else
result = result | 42;
#endif
}
$ ./bin/clang -Wunused-but-set-variable -c test.c
$ ./bin/clang -Wunused-but-set-variable -c test.c -DBUG
test.c:2:7: warning: variable 'result' set but not used
[-Wunused-but-set-variable]
int result = 0;
^
1 warning generated.</pre>
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