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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 --- - Miscompilation with K&R function prototype"
href="https://llvm.org/bugs/show_bug.cgi?id=25309">25309</a>
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<tr>
<th>Summary</th>
<td>Miscompilation with K&R function prototype
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<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>
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<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>anton@samba.org
</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>creduce gave me the following cut down testcase:
#include <assert.h>
static int i;
static int *volatile m = &i, *o = &i;
static void zot(void)
{
assert(*o);
}
void blah() { }
int main(void)
{
*o = 0;
*m = 1;
blah(&o);
zot();
return 0;
}
I was somewhat surprised clang accepts K&R function prototypes, but it does,
and we miscompile the testcase at -O2.</pre>
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