[Bug fortran/54667] [OOP] gimplification failure with c_f_pointer

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54667

--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-09-22 18:38:42 UTC ---
(In reply to comment #7)
> The only other compiler I have access to is ifort 11.1 (which also accepts it),
> so that doesn't add much unfortunately.

As do crayftn and PGI, however, it is a constraint (i.e. the compiler does not
have to diagnose it) but required that the user does. From Fortran 2008
15.2.3.6 and 15.2.3.3:

CPTR shall be a scalar of type C PTR. It is an INTENT (IN) argument. Its value
   shall be
   * the C address of an interoperable data entity, or
   * the result of a reference to C LOC with a noninteroperable argument.

And CLASS is not interoperable, while C_LOC has

 [...] It shall either be a variable with interoperable type and kind type
 parameters, or be a scalar, nonpolymorphic variable with no length type
parameters."

(Note in TS29113, the "scalar, " has been deleted.)