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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang should allow unreachable [[clang::fallthrough]] in template functions if any template expansion uses it"
href="http://llvm.org/bugs/show_bug.cgi?id=18619">18619</a>
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<th>Summary</th>
<td>Clang should allow unreachable [[clang::fallthrough]] in template functions if any template expansion uses it
</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>All
</td>
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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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>joepeck02@gmail.com
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</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11940" name="attach_11940" title="[TEST] Example file">attachment 11940</a> <a href="attachment.cgi?id=11940&action=edit" title="[TEST] Example file">[details]</a></span>
[TEST] Example file
See attached test case.
template<bool strict>
void doSomething(char c)
{
switch (c) {
case 'a': {
if (strict) return;
[[clang::fallthrough]];
}
default:
break;
}
}
Compiling the above will either warn about doSomething<true> with an
unreachable fall through, or doSomething<false> missing [[clang::fallthrough]]:
example.cpp:11:13: warning: fallthrough annotation in unreachable code
[-Wimplicit-fallthrough]
[[clang::fallthrough]];
^
example.cpp:20:5: note: in instantiation of function template
specialization 'doSomething<true>' requested here
doSomething<true>('a');
^
1 warning generated.</pre>
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