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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/55117] Programs fails to read namelist (contains derived types objects)
Date: Fri, 04 Jan 2013 16:59:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55117

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #7 from kargl at gcc dot gnu.org 2013-01-04 16:58:36 UTC ---
(In reply to comment #6)
> Another manifestation of this problem is with type extension.  Here is another
> small example which fails.  (Tested on v4.6.3 and also a 1/4/2013 snapshot of
> the 4.8 trunk.):
> 
> program test_type_extension
> 
>   type t1_t
>      real :: x
>   end type t1_t
> 
>   type, extends(t1_t) :: t1e_t
>      character(8) :: string
>   end type t1e_t
> 
>   type(t1e_t) :: t1e
> 
>   integer :: answer
>   namelist /test_NML/ t1e, answer
> 
>   open(unit=1,file='test1.inp')
>   read(1,NML=test_NML)
> 
>   write(*,*) t1e%x, t1e%string, answer
> 
> end program test_type_extension
> 
> File test1.inp contains:
> 
> &test_NML
> t1e%x = 2.,t1e%string='gfortran',answer=42
> /
> 
> wws@w6ws-4:~/fortran/xxx$ gfortran namelist.f90
> wws@w6ws-4:~/fortran/xxx$ a.out
> At line 17 of file namelist.f90 (unit = 1, file = 'test1.inp')
> Fortran runtime error: Cannot match namelist object name %x

If one modifies your code to have gfortran create the file 
with the namelist, it can then read it back.  Here's what I
have
program test_type_extension

  type t1_t
     real :: x
  end type t1_t

  type, extends(t1_t) :: t1e_t
     character(8) :: string
  end type t1e_t

  type(t1e_t) :: t1e

  integer :: answer
  namelist /test_NML/ t1e, answer

  t1e%x = 2.
  t1e%string='gfortran'
  answer=42

  open(unit=2,file='test2.inp')
  write(2,NML=test_NML)
  close(2)

  t1e%x = 0
  t1e%string=''
  answer=0

  open(unit=2,file='test2.inp')
  read(2,NML=test_NML)
  close(2)

  write(*,*) t1e%x, t1e%string, answer

  open(unit=1,file='test1.inp')
  read(1,NML=test_NML)

  write(*,*) t1e%x, t1e%string, answer

end program test_type_extension

% gfc4x -o z foo.f90 && ./z
   2.00000000     gfortran          42
At line 36 of file foo.f90 (unit = 1, file = 'test1.inp')
Fortran runtime error: Cannot match namelist object name %x

% cat test2.inp 
&TEST_NML
 T1E%T1_T%X=  2.00000000    ,
 T1E%STRING="gfortran",
 ANSWER=         42,
 /

It appears that gfortran's handling of an extended
derived type in its namelist code is incorrect.