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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wexceptions fails to emit for "will be caught by earlier handler" when using aliases"
href="https://llvm.org/bugs/show_bug.cgi?id=28904">28904</a>
</td>
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<tr>
<th>Summary</th>
<td>-Wexceptions fails to emit for "will be caught by earlier handler" when using aliases
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bloerwald@googlemail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</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=16911" name="attach_16911" title="reproducing source as file">attachment 16911</a> <a href="attachment.cgi?id=16911&action=edit" title="reproducing source as file">[details]</a></span>
reproducing source as file
-Wexceptions can detect duplicate `catch`es (e.g. catching int twice), but
fails to do so when using aliasing and aliased types mixed:
$ cat tmp.cpp
typedef int int_;
int main (int, char**) {
try {
throw 1;
}
catch (FIRST) {
return __LINE__;
}
catch (SECOND) {
return __LINE__;
}
return __LINE__;
}
$ for first in int int_; do \
for second in int int_; do \
echo $first $second \
$(clang++ -Weverything tmp.cpp -DFIRST=$first -DSECOND=$second 2>&1 |
wc -l) \
$(./a.out; echo $?); \
done; done
int int 13 7
int int_ 0 7
int_ int 0 7
int_ int_ 13 7
Only the case with the same name is detected (first and last). Note that all
combinations correctly call the first `catch` (line 7).</pre>
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