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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Miscompilation for variadic function call"
href="http://llvm.org/bugs/show_bug.cgi?id=20547">20547</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Miscompilation for variadic function call
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>david.majnemer@gmail.com
</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>consider:
#include <assert.h>
#include <stdarg.h>
static const struct S {
int _[5];
} s;
#define CST 1779363874
void callee_b0f(int a1, int a2, int a3, int a4, struct S a5, int a6, int a7,
...) {
va_list ap;
va_start(ap, a7);
int c = va_arg(ap, int);
assert(CST == c);
}
int main() {
callee_b0f(0, 0, 0, 0, s, 0, 0, CST);
return 0;
}
compiling this on a x86_64-unknown-linux-gnu fires an assert, gcc 4.6.3
compiles this just fine.</pre>
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