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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "no matching constructor" when "using" template base class constructor"
href="https://bugs.llvm.org/show_bug.cgi?id=39076">39076</a>
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<th>Summary</th>
<td>"no matching constructor" when "using" template base class constructor
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<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>duvan.llvm@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20920" name="attach_20920" title="Small source code file to reproduce the problem.">attachment 20920</a> <a href="attachment.cgi?id=20920&action=edit" title="Small source code file to reproduce the problem.">[details]</a></span>
Small source code file to reproduce the problem.
When compiling the attached file
bash> clang++ --std=c++17 bug.C
clang errors out with:
bug.C:14:15: error: no matching constructor for initialization of 'Sub<double>'
Sub<double> sub(nullptr);
^ ~~~~~~~
bug.C:8:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'nullptr_t' to 'const Sub<double>' for 1st
argument
struct Sub : public Base<T, T> {
^
bug.C:8:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'nullptr_t' to 'Sub<double>' for 1st argument
struct Sub : public Base<T, T> {
^
bug.C:8:8: note: candidate constructor (the implicit default constructor) not
viable: requires 0 arguments, but 1 was provided
1 error generated.
It seems the base class constructor Base(double*) is not picked up despite the
using base = Base<T, T>;
using typename base::Base;
Works in gcc 8.2.0.</pre>
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