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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compile error related to constexpr variable template in a template class"
href="https://bugs.llvm.org/show_bug.cgi?id=40195">40195</a>
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<th>Summary</th>
<td>Compile error related to constexpr variable template in a template class
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++'17
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ambrop7@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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<pre>The following C++17 program does not compile:
template<typename>
struct A {
template<typename>
inline static constexpr int X = 1;
inline static constexpr int Y = X<void>;
};
constexpr int Y = A<void>::Y;
clang++ -std=c++17 main.cpp
main.cpp:7:19: error: constexpr variable 'Y' must be initialized by a constant
expression
constexpr int Y = A<void>::Y;
^~~~~~~~~~
1 error generated.
This error is produced with any Clang version starting with 5.0.0 (where
sufficient C++17 support appeared). It compiles with GCC (7.1 and newer).</pre>
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