[Dwarf-Discuss] C++14 deduced return type

[Jason Merrill]

C++14 will allow declaration of functions with a return type that will 
be deduced from return statements in the definition:

struct A {
   auto f(); // return type unknown
};
auto A::f() { return 42; } // return type is int

When we emit the debug information for A, we may not yet know what the 
return type of f is, and we need to handle that somehow in DWARF.  My 
inclination is just to leave off the DW_AT_type on the member 
declaration, and then provide one on the specification; consumers ought 
to handle that fine, though in the absence of a specification they will 
treat the declaration as having a return type of void.

Jason