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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Layout difference of packed struct different from GCC"
href="http://llvm.org/bugs/show_bug.cgi?id=18613">18613</a>
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<th>Summary</th>
<td>Layout difference of packed struct different from GCC
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>david.majnemer@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>we disagree with gcc but agree with icc on the following:
extern "C" int printf(const char *, ...);
struct A {};
struct B : public virtual A {};
struct C : public A {};
struct D : public A, public B {};
#pragma pack(push, 4)
struct E : public B, public A, public virtual D {};
#pragma pack(pop)
int main() { printf("sizeof(E): %zu\n", sizeof(E)); }
gcc gives sizeof(E): 24
clang and icc give sizeof(E): 20</pre>
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