https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70827
Bug ID: 70827
Summary: [6 regression] dubious use of deleted function in
inherited constructor
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lucdanton at free dot fr
Target Milestone: ---
struct move_only {
move_only() = default;
move_only(move_only&&) = default;
};
struct base {
base(move_only) {}
};
struct derived: base {
// error: use of deleted function 'constexpr move_only::move_only(const
move_only&)'
using base::base;
};
int main()
{
// note: synthesized method 'derived::derived(move_only)' first required
here
derived h(move_only {});
}
=====
Using GCC 6.1:
$ g++-trunk --version
g++-trunk (GCC) 6.1.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++-trunk -std=c++11 main.cpp
main.cpp: In constructor 'derived::derived(move_only)':
main.cpp:12:17: error: use of deleted function 'constexpr
move_only::move_only(const move_only&)'
using base::base;
^~~~
main.cpp:1:8: note: 'constexpr move_only::move_only(const move_only&)' is
implicitly declared as deleted because 'move_only' declares a move constructor
or move assignment operator
struct move_only {
^~~~~~~~~
main.cpp: In function 'int main()':
main.cpp:18:27: note: synthesized method 'derived::derived(move_only)' first
required here
derived h(move_only {});
=====
The program compiles fine with 5.3.1, earlier 6 snapshots, and Clang.
