[Bug fortran/60922] [4.9/5 regression] Memory leak with INTENT(OUT) CLASS argument w/ allocatable CLASS components

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60922

janus at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #6 from janus at gcc dot gnu.org ---
Here is a reduced and cleaned-up test case:


program test_leak
  implicit none

  type d_base_vect_type
  end type

  type d_vect_type
    class(d_base_vect_type), allocatable :: v
  end type

  type(d_vect_type) :: ainvd
  integer :: itx

  do itx=1,2
    write(*,*) 'Iteration ',itx
    call d_vect_bld_x(ainvd)
  end do

contains

  subroutine d_vect_bld_x(x)
    class(d_vect_type), intent(out) :: x
    allocate(x%v)
  end subroutine

end program


With 4.9 and trunk (but not with 4.8), valgrind shows:

==11044== 1 bytes in 1 blocks are definitely lost in loss record 2 of 2
==11044==    at 0x4C2ABA0: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11044==    by 0x40102F: d_vect_bld_x.3431 (test_leak.f90:23)
==11044==    by 0x400EA3: MAIN__ (test_leak.f90:16)
==11044==    by 0x401096: main (test_leak.f90:14)