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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Inherited constructor unusable for constexpr static member of class template"
href="https://bugs.llvm.org/show_bug.cgi?id=47555">47555</a>
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<th>Summary</th>
<td>Inherited constructor unusable for constexpr static member of class template
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</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>feodor.alexeev@gmail.com
</td>
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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>Given the code (godbolt link <a href="https://godbolt.org/z/dc1G1W">https://godbolt.org/z/dc1G1W</a>):
struct Storage {
explicit constexpr Storage(int) {}
};
struct Derived : Storage {
using Storage::Storage;
};
// static Derived kInstance{1};
template<typename>
struct Template {
static constexpr Derived kDerived{0};
};
Both clang 10.0.1 and current clang trunk (reported as 12.0.0) on Compiler
Explorer emit the following error:
<source>:13:30: error: constexpr variable 'kDerived' must be initialized by a
constant expression
static constexpr Derived kDerived{0};
^~~~~~~~~~~
<source>:13:30: note: constructor inherited from base class 'Storage' cannot be
used in a constant expression; derived class cannot be implicitly initialized
<source>:6:20: note: declared here
using Storage::Storage;
^
Worth noting, uncommenting the line "static Derived kInstant{1};" or commenting
out "template<typename>" makes code compile.</pre>
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