https://bugs.llvm.org/show_bug.cgi?id=39076
Bug ID: 39076
Summary: "no matching constructor" when "using" template base
class constructor
Product: clang
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangbugs at nondot.org
Reporter: duvan.llvm at gmail.com
CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
Created attachment 20920
--> https://bugs.llvm.org/attachment.cgi?id=20920&action=edit
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.
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