[jira] Commented: (STDCXX-301) [XLC++ 8.0] bogus error 1540-0062 explicitly instantiating class template before definition

["Martin Sebor (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/STDCXX-301?page=comments#action_12450534 ] 
            
Martin Sebor commented on STDCXX-301:
-------------------------------------

I think the original test case can be simplified to this:

$ cat t.cpp && xlC -qversion && xlC -c t.cpp
struct A;
template <class T> struct B { void foo (T = T::foo ()); };
template struct B<A>;
struct A { int foo (); };

IBM XL C/C++ Enterprise Edition V8.0 for AIX   
Version: 08.00.0000.0010  
"t.cpp", line 2.43: 1540-0062 (S) The incomplete class "A" must not be used as a qualifier.
"t.cpp", line 3.17: 1540-0700 (I) The previous message was produced while processing "struct B<A>".


> [XLC++ 8.0] bogus error 1540-0062 explicitly instantiating class template before definition
> -------------------------------------------------------------------------------------------
>
>                 Key: STDCXX-301
>                 URL: http://issues.apache.org/jira/browse/STDCXX-301
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: External
>         Environment: IBM XLC++ 8.0
>            Reporter: Martin Sebor
>
> PMR 02310,K78,000
> The well-formed program below fails to compile with XLC++ 8.0 on AIX (I haven't checked Linux). It compiles successfully with XLC++ 7.0.
> $ cat t.cpp && xlC -qversion && xlC -c t.cpp
> template <class> 
> struct A {
>     static int foo ();
>     static int bar (int);
> };
> template <class, class> class B;
> template <class T, class U>
> struct C {
>     int operator*() { return U::bar (b->baz ()); }
>     B<T, U> *b;
> };
> template <class, class U>
> struct D {
>     void barf (U);
> };
> template struct D<int, C<int, A<int> > >;
> template <class, class U>
> struct B {
>     int baz ();
>     virtual int foobar (int i = U::foo ()) { return i; }
> };
> template <class T, class U>
> void D<T, U>::barf (U u)
> {
>     *u;
> }
> IBM XL C/C++ Enterprise Edition V8.0 for AIX   
> Version: 08.00.0000.0010  
> "t.cpp", line 28.33: 1540-0062 (S) The incomplete class "U" must not be used as a qualifier.
> "t.cpp", line 12.39: 1540-0700 (I) The previous message was produced while processing "struct B<int,A<int> >".

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