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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 --- - MS ABI: insufficient padding inserted between zero sized virtual bases in a record with a bitfield"
href="http://llvm.org/bugs/show_bug.cgi?id=18702">18702</a>
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<th>Summary</th>
<td>MS ABI: insufficient padding inserted between zero sized virtual bases in a record with a bitfield
</td>
</tr>
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<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>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
extern "C" int printf(const char *, ...);
struct A {};
struct B {};
struct C : virtual A, virtual B {
int Field : 3;
C() {
printf("A: %Iu\n", (char *)(A *)this - (char *)this);
printf("B: %Iu\n", (char *)(B *)this - (char *)this);
}
};
int main() { C(); printf("sizeof(C): %Iu\n", sizeof(C)); }
clang gives us:
A: 12
B: 20
sizeof(C): 20
msvc gives:
A: 12
B: 24
sizeof(C): 24</pre>
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