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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [MS] Clang mangles lambdas in member initializers incorrectly"
href="https://llvm.org/bugs/show_bug.cgi?id=31197">31197</a>
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<th>Summary</th>
<td>[MS] Clang mangles lambdas in member initializers incorrectly
</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>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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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>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
struct A {
int x = []() { return 1; }();
int y = []() { return 2; }();
};
int main() {
A a;
return a.x + a.y;
}
Clang optimizes this program to return 2 on Windows, because both lambdas use
the mangling context of the expression evaluation contexts of 'x' and 'y'
respectively.
This is underlying cause of the current Windows build failures in
ToolingTest.cpp:
<a href="http://lab.llvm.org:8011/builders/clang-x86-windows-msvc2015/builds/846">http://lab.llvm.org:8011/builders/clang-x86-windows-msvc2015/builds/846</a>
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\xutility(285,3):
error: definition with same mangled name as another definition
_Compressed_pair(_One_then_variadic_args_t,
^
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\xutility(285,3):
note: previous definition is here
C:\Program Files (x86)\Microsoft Visual Studio
14.0\VC\INCLUDE\xutility(298,14): error: definition with same mangled name as
another definition
const _Ty1& _Get_first() const _NOEXCEPT</pre>
</div>
</p>
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