http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45900
Summary: [OOP] Polymorphic method not called
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ort...@gmail.com
The following example code provides an incorrect result using gfortran 4.6.0
20100925. I believe the code is valid and I have tested the same code with the
Intel Fortran compiler (ifort) 11.1 on Linux and the results returned are
correct. See the below example:
types.f90
---------------------------------------------------------
module A
implicit none
type :: aType
contains
procedure :: callback
end type aType
contains
subroutine callback( callback_ )
implicit none
class(aType) :: callback_
print *, "Error: aType method called."
end subroutine callback
subroutine solver( callback_ )
implicit none
class(aType) :: callback_
call callback_%callback()
end subroutine solver
end module A
module B
use A, only: aType
implicit none
type, extends(aType) :: bType
integer :: i
contains
procedure :: callback
end type bType
contains
subroutine callback( callback_ )
implicit none
class(bType) :: callback_
print *, "Made it."
end subroutine callback
end module B
program main
use A
use B
implicit none
type(bType) :: bTypeInstance
integer :: iflag
bTypeInstance%i = 4
call bTypeInstance%callback()
call solver( bTypeInstance )
end program main
---------------------------------------------------------
The result produced running this code are found to be:
$ gfortran -o t types.f90
$ ./t
Error: aType method called.
Made it.
While ifort correctly produces the result:
Made it.
Made it.
A workaround is to do change "use A" in the main to:
use A, only: solver
Using built-in specs.
COLLECT_GCC=gfortran
Target: x86_64-apple-darwin10.4.0
Configured with: ../gcc-4.6-20100925/configure --prefix=~$HOME/gcc-trunk
--enable-languages=fortran --enable-checking=release --disable-bootstrap
Thread model: posix
gcc version 4.6.0 20100925 (experimental) (GCC)
