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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang compiles a return statement with an expression in a void function (illegal under C90 6.6.6.4) with -std=c90 -pedantic"
href="https://llvm.org/bugs/show_bug.cgi?id=27055">27055</a>
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<th>Summary</th>
<td>Clang compiles a return statement with an expression in a void function (illegal under C90 6.6.6.4) with -std=c90 -pedantic
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</td>
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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>
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<th>Keywords</th>
<td>accepts-invalid
</td>
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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>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>ryao@gentoo.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16082" name="attach_16082" title="Test case where Clang allows a void function to return an expression">attachment 16082</a> <a href="attachment.cgi?id=16082&action=edit" title="Test case where Clang allows a void function to return an expression">[details]</a></span>
Test case where Clang allows a void function to return an expression
ISO C90 6.6.6.4 says that "A return statement with an expression shall not
appear in a function whose return type is void."
Both Sun Studio and the TenDRA make this a build failure as the specification
requires while Clang does what GCC does. The sudo project had a bug filed
agaisnt it because of Sun Studio:
<a href="https://bugzilla.sudo.ws/show_bug.cgi?id=727">https://bugzilla.sudo.ws/show_bug.cgi?id=727</a>
Clang will only emit a warning when -pendantic is specified and adding -std=c90
does not change the behavior to a warning. The GCC documentation for -pedantic
clearly states that things disallowed by the specification emit errors:
<a href="https://gcc.gnu.org/onlinedocs/gcc-4.9.3/gcc/Warning-Options.html">https://gcc.gnu.org/onlinedocs/gcc-4.9.3/gcc/Warning-Options.html</a>
This probably should be a warning even without `-pendantic`.
This was also filed against GCC, which exhibits the same behavior:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70400">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70400</a>
Also, I tested the attached minimal test case against both GCC 4.9.3 and Clang
3.8.0. kate in ##c on freenode tested against TenDRA while the reporter for the
sudo bug caught the issue in sudo with Sun Studio 12.</pre>
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