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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wall does not enable -Wconditional-uninitialized"
href="http://llvm.org/bugs/show_bug.cgi?id=17974">17974</a>
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<th>Summary</th>
<td>-Wall does not enable -Wconditional-uninitialized
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.3
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</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>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>christophe@taodyne.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Undetected use of uninitialised variable (detected at -O2 -Wall by gcc)"
href="show_bug.cgi?id=17940">Bug #17940</a> reported a case where gcc reports an uninitialised variable at -Wall
-O2, but clang does not. The bug was marked as "RESOLVED INVALID" because the
option -Wconditional-uninitialized exposes the bug. So I'm opening a new bug
because -Wall obviously does not enable that option:
ddd@Marypuce ~> clang -Wall -c -O2 /tmp/undetected.cpp
ddd@Marypuce ~> clang -Wconditional-uninitialized -c -O2 /tmp/undetected.cpp
/tmp/undetected.cpp:9:12: warning: variable 'result' may be uninitialized when
used here [-Wconditional-uninitialized]
return result;
^~~~~~
/tmp/undetected.cpp:6:17: note: initialize the variable 'result' to silence
this
warning
char *result;
^
= 0
1 warning generated.</pre>
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