[Bug c++/84287] New: pointer to member function type with dependent parameter cannot be mangled

["jens.maurer at gmx dot net" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84287

            Bug ID: 84287
           Summary: pointer to member function type with dependent
                    parameter cannot be mangled
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jens.maurer at gmx dot net
  Target Milestone: ---

This is a (reduced) attempt at SFINAE, which fails with gcc 7.3:


struct S {
  void f(const int&);
};

template<class T>
int g(T x, decltype(static_cast<void (S::*)(const T&)>(&S::f)) * = nullptr) { }

int x = g(0);


$ g++  x.cc
x.cc: In instantiation of ‘int g(T, decltype (static_cast<void (S::*)(const
T&)>(& S::f))*) [with T = int]’:
x.cc:6:5: sorry, unimplemented: mangling offset_ref
 int g(T x, decltype(static_cast<void (S::*)(const T&)>(&S::f)) * = nullptr) {
}
     ^