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[Bug fortran/60718] Test case gfortran.dg/select_type_4.f90 fails on ARM


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60718

--- Comment #11 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Bernd Edlinger from comment #6)
> hmm,
> 
> gfc_build_class_symbol creates different types,
> if a class has the allocatable, target or pointer attribute.
> 
>   get_unique_hashed_string (tname, ts->u.derived);
>   if ((*as) && attr->allocatable)
>     sprintf (name, "__class_%s_%d_%da", tname, rank, (*as)->corank);
>   else if ((*as) && attr->pointer)
>     sprintf (name, "__class_%s_%d_%dp", tname, rank, (*as)->corank);
>   else if ((*as))
>     sprintf (name, "__class_%s_%d_%d", tname, rank, (*as)->corank);
>   else if (attr->pointer)
>     sprintf (name, "__class_%s_p", tname);
>   else if (attr->allocatable)
>     sprintf (name, "__class_%s_a", tname);
>   else
>     sprintf (name, "__class_%s", tname);
> 
> 

One other thing, should be noted:

the above code causes name clashes, if the class name ends with "_p"
as demonstrated in the following test example:

cat unique_name.f90
! { dg-do run }
!
module test_module

  implicit none

  type, public :: test_p
    private
    class(test_p), pointer :: next => null()
  end type test_p

  type, public :: test
!  call do_it (x)
!  Error: Type mismatch in argument 'x' at (1); passed CLASS(test_p) to
CLASS(test)
    class(test), pointer :: next => null()
  end type test

contains

  subroutine do_it (x)
    class(test_p), target :: x

    x%next => x
    return
  end subroutine do_it

end module test_module

  use test_module
  class(test_p), pointer :: x
  allocate (x)
  call do_it (x)
  deallocate (x)
end


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