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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Win] LNK2005: bool const std::_Is_integral<bool> already defined"
href="https://bugs.llvm.org/show_bug.cgi?id=42027">42027</a>
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<th>Summary</th>
<td>[Win] LNK2005: bool const std::_Is_integral<bool> already defined
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++14
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mikhail.strelnikov@gmail.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Self-hosting on Windows
(<a href="https://github.com/llvm/llvm-project/blob/master/llvm/utils/release/build_llvm_package.bat">https://github.com/llvm/llvm-project/blob/master/llvm/utils/release/build_llvm_package.bat</a>)
is broken by this commit:
<a href="https://github.com/llvm-mirror/clang/commit/4241f674da3531d69abc759d727fb0ae7b31535e">https://github.com/llvm-mirror/clang/commit/4241f674da3531d69abc759d727fb0ae7b31535e</a>
Another way to reproduce the bug:
// h.hpp
#pragma once
template<typename T>
constexpr bool v = false;
template <>
constexpr bool v<bool> = true;
// unit1.cpp
#include "h.hpp"
// unit2.cpp
#include "h.hpp"
int main()
{
return v<bool>;
}
# clang++ -std=c++14 unit1.cpp unit2.cpp
error LNK2005: "bool const v<bool>" (??$v@_N@@3_NB) already defined
I've no idea if it is OK code for C++14, but this is what MS STL does in its
<xtr1common> header.</pre>
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