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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect diagnostic issued by -Wunreachable-code for switch case on enums"
href="http://llvm.org/bugs/show_bug.cgi?id=19494">19494</a>
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<th>Summary</th>
<td>Incorrect diagnostic issued by -Wunreachable-code for switch case on enums
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.2
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>eyal.lotem@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12414" name="attach_12414" title="Small test case">attachment 12414</a> <a href="attachment.cgi?id=12414&action=edit" title="Small test case">[details]</a></span>
Small test case
A comprehensive switch(enum_value) that has a case for each named enum value,
all of which have a "return" confuses clang. It believes that no possible
runtime value is possible besides the named enum values, however this is
incorrect. C (and clang) allow enum-typed variables to be assigned from
non-named values of the enum.
The test case compiles into a correct executable, but if compiled with
-Wunreachable-code, issues an incorrect warning like:
clang -Wunreachable-code -o testclangunreachable testclangunreachable.c &&
./testclangunreachable
testclangunreachable.c:11:12: warning: will never be executed
[-Wunreachable-code]
printf("Unreachable code reached!\n");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
Unreachable code reached!</pre>
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