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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __attribute__((noreturn)) merged in an if-expression "?:""
href="http://llvm.org/bugs/show_bug.cgi?id=16982">16982</a>
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<th>Summary</th>
<td>__attribute__((noreturn)) merged in an if-expression "?:"
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.3
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>LLVM Codegen
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>crabcaek@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>In the following code, if the parameter `err' is zero, the functions will
return.
good(0) returns fine, but bad(0) doesn't, the thread returns from dontexit()
into garbage memory.
void exit(int) __attribute__((noreturn));
void dontexit(int);
int good(int err)
{
if(err)
exit(0);
else
dontexit(0);
}
int bad(int err)
{
(err ? exit : dontexit)(0);
}
It looks like the types "void (int)" and "void (int) __attribute__((noreturn))"
are being merged into "void (int)" for the ?: expression, and so clang assumes
"(err ? exit : dontexit)(0)" doesn't return.
This happens on both -O0, -Os and -O3.
Possibly related to #10347.</pre>
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</p>
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