[Bug c++/101356] The non-public member of a local class cannot be accessed by a friend of the class

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101356

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-08-02 00:00:00         |2021-12-13
             Blocks|                            |65608

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
When we do friend void ::show(); we get the following warning:

<source>: In function 'auto fun()':
<source>:5:21: warning: 'void show()' has not been declared within '::'
    5 |         friend void ::show();
      |                     ^~
<source>:3:10: note: only here as a 'friend'
    3 |     void show();
      |          ^~~~


And even this is rejected:
namespace A {
void show();
}
auto fun(){
    struct C{
        friend void A::show();
        private:
          int c;
    };
    return C{};
}
void A::show(){
   auto o = fun();
   o.c = 0;
}


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65608
[Bug 65608] [meta-bug] friend issues