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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang (both trunk and 3.4) hangs at -Os and above on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=18556">18556</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang (both trunk and 3.4) hangs at -Os and above on x86_64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>su@cs.ucdavis.edu
</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>The following testcase causes the current clang trunk and clang 3.4 to hang
when compiling at -Os and above in both 32-bit and 64-bit mode on
x86_64-linux-gnu.
This is a regression from clang 3.3.
$ clang-trunk -v
clang version 3.5 (trunk 199196)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
$ clang-trunk -O1 -c small.c
$ clang-3.3 -Os -c small.c
$
$ timeout -s 9 10 clang-trunk -Os -c small.c
Killed
$ timeout -s 9 10 clang-3.4 -Os -c small.c
Killed
$
-------------------------------------
int a, b, e, *g = &e;
unsigned short c, d;
void
fn1 ()
{
int *e, **f;
f = &e;
*f = 0;
for (c = 0; c != 1;)
{
for (d = 1; d; d++)
{
*f = &a;
if (**f)
continue;
*g = 0;
}
if (**f)
continue;
b = 0;
}
}
void
fn2 ()
{
fn1 ();
fn1 ();
}</pre>
</div>
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