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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MS __declspec(empty_bases) generates error with virtual inheritance"
href="https://bugs.llvm.org/show_bug.cgi?id=37015">37015</a>
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<th>Summary</th>
<td>MS __declspec(empty_bases) generates error with virtual inheritance
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>6.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>soumi.manna@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>The below program fails to generate correct size of Derived class when
__declspec(empty_bases) is applied on virtual inheritance. Microsoft compiler
compiles the test.
bash-3.2$ cat test.cpp
struct Empty1 {};
struct Empty2 {};
struct __declspec(empty_bases) Derived : virtual Empty2
{
};
static_assert(sizeof(Derived) == 8, "Derived should be 8 byte");
struct Derived1 : virtual Derived, virtual Empty1
{
};
static_assert(sizeof(Derived1) == 16, "Derived1 should be 16 byte");
bash-3.2$ clang -c test.cpp
test.cpp:12:1: error: static_assert failed "Derived1 should be 16 byte"
static_assert(sizeof(Derived1) == 16, "Derived1 should be 16 byte");
^ ~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
bash-3.2$ cl -c test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24210 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
test.cpp</pre>
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