http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56596
janus at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code CC| |janus at gcc dot gnu.org --- Comment #1 from janus at gcc dot gnu.org 2013-03-13 14:17:40 UTC --- Reduced test case: program main implicit none type :: base_type integer :: i end type type, extends(base_type) :: extended_type integer :: j end type class(base_type), dimension(:), allocatable :: a type(extended_type), dimension(1:2) :: tmp allocate (extended_type :: a(2)) tmp%i=a%i end I think the problem is in the allocate statement: a._data.data = (void * restrict) __builtin_malloc (8); The allocation size seems to be independent of whether one allocates with "base_type" or "extended type".