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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang rejects narrowing conversions in case labels"
href="https://bugs.llvm.org/show_bug.cgi?id=35287">35287</a>
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<th>Summary</th>
<td>Clang rejects narrowing conversions in case labels
</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>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Keywords</th>
<td>compile-fail
</td>
</tr>
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<th>Severity</th>
<td>normal
</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>miyuki-llvm@miyuki.ru
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Consider the following test case:
$ cat test.cc
int main() {
switch (0u) {
case -1: break;
}
}
Clang rejects this code when compiling in C++11 and later modes with the
following error:
$ clang++ -std=c++11 -fsyntax-only test.cc
test.cc:3:10: error: case value evaluates to -1, which cannot be narrowed to
type 'unsigned int' [-Wc++11-narrowing]
case -1: break;
^
GCC and EDG (ICC 18) accept this code: <a href="https://godbolt.org/g/hVWQgW">https://godbolt.org/g/hVWQgW</a>
ISTM that Clang is wrong (nothing in [stmt.switch] suggests that narrowing
conversions are not allowed in case labels).</pre>
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