[Bug fortran/64209] [OOP] runtime segfault with CLASS(*), INTENT(OUT) dummy argument

["janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64209

--- Comment #6 from janus at gcc dot gnu.org ---
Here is a reduced test case for the remaining segfault:

PROGRAM main
  IMPLICIT NONE
  INTEGER :: copy_x(3)
  CALL copy(1,copy_x)
  PRINT *, copy_x
CONTAINS
  SUBROUTINE copy(x,a)
    integer, INTENT(IN) :: x
    CLASS(*), INTENT(OUT) :: a(:)
      SELECT TYPE(a); TYPE IS(integer)
    a(:) = x
      END SELECT
  END SUBROUTINE
END PROGRAM


It's a very similar scheme as in comment #2, only this time we have an
array-valued CLASS(*), INTENT(OUT) argument.


I think the problem is with _def_init being NULL again. For the array case here
the dump shown a line like:

    a->_vptr->_copy (a->_vptr->_def_init, &a->_data);

Again we need a conditional check for _def_init being non-NULL.