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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - missed -Wsometimes-uninitialized for switch statement without default"
href="https://bugs.llvm.org/show_bug.cgi?id=41684">41684</a>
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<th>Summary</th>
<td>missed -Wsometimes-uninitialized for switch statement without default
</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
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>masahiroy@kernel.org
</td>
</tr>
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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>[test case 1]
int foo(int x)
{
int y;
switch (x) {
case 1:
y = 1;
break;
}
return y;
}
[test case 2]
int foo(int x)
{
int y;
switch (x) {
case 1:
y = 1;
break;
default:
break;
}
return y;
}
The difference between [test case 1] and [test case 2]
is the presence of "default:' label.
$ clang -O2 -Wsometimes-uninitialized -c -o test.o test.c
produced the same object for both cases.
However, clang reports Wsometimes-uninitialized warning
for [test case 2], but does not for [test case 1].</pre>
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