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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 --- - Clang miscompiles varargs function when targeting x86_64-pc-win32"
href="http://llvm.org/bugs/show_bug.cgi?id=20569">20569</a>
</td>
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<th>Summary</th>
<td>Clang miscompiles varargs function when targeting x86_64-pc-win32
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<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>
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<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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
#include <assert.h>
#include <stdarg.h>
static const struct S {
int x[3];
} global = {{1, 2, 3}};
static void f(int arg, ...) {
va_list ap;
va_start(ap, arg);
struct S s = va_arg(ap, struct S);
assert(global.x[0] == s.x[0]);
va_end(ap);
}
int main() {
f(0, global);
return 0;
}
This test succeeds using gcc, clang and MSVC.</pre>
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