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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GNU statement expression in static initializer is miscompiled to all bytes zero"
href="https://llvm.org/bugs/show_bug.cgi?id=29024">29024</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>GNU statement expression in static initializer is miscompiled to all bytes zero
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<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>ju.orth@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following example:
------------
struct x {
unsigned char i;
};
const struct x *f(void);
const struct x *f(void)
{
static const struct x *x = __extension__ ({
static const struct x z = { .i = 255 };
&z;
});
return x;
}
const struct x *g(void);
const struct x *g(void)
{
static const struct x z = { .i = 255 };
static const struct x *x = &z;
return x;
}
-----------
which miscompiles to
-----------
f:
movl $f.z, %eax
retq
g:
movl $g.z, %eax
retq
f.z:
.zero 1
g.z:
.byte 255
-----------
GCC rejects statement expressions in constant positions.</pre>
</div>
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