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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 --- - wrong code at -O1 and higher, variadic function"
href="http://llvm.org/bugs/show_bug.cgi?id=17311">17311</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O1 and higher, variadic function
</td>
</tr>
<tr>
<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>Linux
</td>
</tr>
<tr>
<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>jed@59a2.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</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=11253" name="attach_11253" title="test case">attachment 11253</a> <a href="attachment.cgi?id=11253&action=edit" title="test case">[details]</a></span>
test case
Attached is a test case that I have reduced after noticing in the error
handling code of one of my projects. It is only present with clang at -O1 and
higher.
$ make a.out && ./a.out
clang -Wall -Wextra -pedantic -std=c99 -O1 -g -c -o a.o a.c
clang -Wall -Wextra -pedantic -std=c99 -O1 -g -c -o xrank.o xrank.c
clang -o a.out a.o xrank.o
main() line 47 in /dir/NOT THE FILE NAME
At any lower optimization level, or with gcc, this program prints the expected
output:
main() line 47 in /dir/a.c
I'm running Archlinux from today (2013-09-20),
clang version 3.3 (tags/RELEASE_33/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Linux batura 3.11.1-1-ARCH #1 SMP PREEMPT Sat Sep 14 19:30:21 CEST 2013 x86_64
GNU/Linux
Test case also available at:
<a href="https://gist.github.com/jedbrown/6646889">https://gist.github.com/jedbrown/6646889</a></pre>
</div>
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