[Bug c++/66443] New: Virtual inheritance vs. non-default constructors

["vpozdyayev at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66443

            Bug ID: 66443
           Summary: Virtual inheritance vs. non-default constructors
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vpozdyayev at gmail dot com
  Target Milestone: ---

This code has become valid in C++14, see
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1611 (and #1658).

Current result:
main.cpp: In constructor 'C::C()':
main.cpp:13:15: error: use of deleted function 'B::B()'
...

class A {
public:
    A( int ) {  }
};

class B: virtual public A {
public:
    virtual void do_something() = 0;
};

class C: public B {
public:
    C(): A( 1 ) {  }
    virtual void do_something() {  }
};

int main() {
    C c;
    return 0;
}