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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - missing return value"
href="http://llvm.org/bugs/show_bug.cgi?id=15688">15688</a>
</td>
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<th>Summary</th>
<td>missing return value
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>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>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>drivehappy@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10303" name="attach_10303" title="Reproduce source code">attachment 10303</a> <a href="attachment.cgi?id=10303&action=edit" title="Reproduce source code">[details]</a></span>
Reproduce source code
When a function contains a missing return value when a return type is specified
the program will contain undefined results. For the attached code I receive an
"Illegal instruction" when running the executable.
The ISO C++ standard 6.6.3 does state that, "Flowing off the end of a function
is equivalent to a return with no value; this results in undefined behavior in
a value-returning function." If this is the reason clang is generating code
then I would consider it resolved. However some more diagnostics might be more
helpful, instead of the seemingly benign warning of: "missing_return.cpp:2:1:
warning: control reaches end of non-void function"
Appears in Clang 3.2 and trunk, under Debug and Release for both 32 and 64-bit
generated code.</pre>
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</p>
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