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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wconditional-uninitialized false positive"
href="http://llvm.org/bugs/show_bug.cgi?id=18709">18709</a>
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<th>Summary</th>
<td>-Wconditional-uninitialized false positive
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>htam@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>-Wconditional-uninitialized leads to a number of false positives when variables
are conditionally saved and restored, even though the condition doesn't change
throughout the function.
$ cat foo.c
void foo(int bar) {
int baz = 0;
int baz_save;
if (bar) baz_save = baz;
if (bar) baz = baz_save;
}
$ clang foo.c -Wconditional-uninitialized -o /dev/null -c
foo.c:6:20: warning: variable 'baz_save' may be uninitialized when used here
[-Wconditional-uninitialized]
if (bar) baz = baz_save;
^~~~~~~~
foo.c:3:17: note: initialize the variable 'baz_save' to silence this warning
int baz_save;
^
= 0
1 warning generated.</pre>
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