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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - False positive warning on out param"
href="https://bugs.llvm.org/show_bug.cgi?id=50379">50379</a>
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<th>Summary</th>
<td>False positive warning on out param
</td>
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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>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>alonzakai@gmail.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>$ cat a.cpp
void foo(int& x) {
x = 10;
}
int main() {
int x;
foo(x);
return x;
}
$ clang++ a.cpp -W
a.cpp:1:15: warning: parameter 'x' set but not used
[-Wunused-but-set-parameter]
void foo(int& x) {
^
1 warning generated.
It is technically true that x is set but not used, but it is an out param, so
that is a natural way to use it, and I don't think it should warn?
This changed in the last few days, based on it starting to break on our CI
today.</pre>
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