[Bug c++/121428] New: extern and member function definitions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121428

            Bug ID: 121428
           Summary: extern and member function definitions
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

We should reject the following due to [dcl.stc]/5: The extern specifier shall
be applied only to the declaration of a variable or function.
The extern specifier shall not be used in the declaration of a class member or
function parameter.

```
class X {
public:
        void mf();
};

extern void X::mf()
{
}

int main()
{
    X x;
    x.mf();
}
```