[MacPorts] #47332: gcc46 @4.6.4_7 gfortran internal compiler error related to procedure pointers

1 Apr 2015

      #47332: gcc46 @4.6.4_7 gfortran internal compiler error related to procedure
pointers
----------------------+--------------------------------
 Reporter:  wyeast@…  |      Owner:  macports-tickets@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:            |       Port:  gcc46 gcc47 gcc48
----------------------+--------------------------------
 When compiling with gfortran I get an internal compiler error when
 compiling code that allocates a derived type that includes a function
 (procedure) pointer which returns an array.  I see the same error with all
 of the following ports: gcc46 @4.6.4_7, gcc47 @4.7.4_3, and gcc48
 @4.8.4_0.  I am using a 10.6.8 Mac, but a coworker sees the same error
 with 10.9.5 (and gcc46 @4.6.4_7).

 The same code compiles fine with the same versions of gfortran listed
 above on Ubuntu and Homebrew.  Removing the array from being the return
 argument (e.g., making it an output argument) makes the error go away.

 The specific error is:
 {{{
 decomp.F: In function 'decomp_register_method':
 decomp.F:27:0: internal compiler error: in gfc_conv_descriptor_data_set,
 at fortran/trans-array.c:171
 Please submit a full bug report,
 with preprocessed source if appropriate.
 See <https://trac.macports.org/newticket> for instructions.
 }}}

 A minimal piece of code that can reproduce the bug is:
 {{{
 module decomp

    implicit none

    abstract interface
       function decomp_function(input) result(output)
          integer, intent(in) :: input
          integer, dimension(:), pointer :: output
       end function
    end interface

    type decomp_list
       procedure (decomp_function), pointer, nopass :: decompFunc => null()
    end type decomp_list

    type (decomp_list), save, pointer :: decompositions => null()

    contains

    subroutine decomp_register_method(decompList, decompFunc)
       type (decomp_list), pointer :: decompList
       procedure (decomp_function), pointer :: decompFunc

       type (decomp_list), pointer :: decompCursor

       allocate(decompCursor )
       decompCursor % decompFunc => decompFunc

    end subroutine decomp_register_method

 end module decomp
 }}}
 and can be compiled with "gfortran -ffree-form -c decomp.F" (assuming it's
 named decomp.F).

 A diff that will allow the code to compile is:
 {{{
 @@ -4,9 +4,10 @@ module decomp
     implicit none

     abstract interface
 -      function decomp_function(input) result(output)
 +      function decomp_function(input, output) result(ierr)
           integer, intent(in) :: input
 -         integer, dimension(:), pointer :: output
 +         integer, dimension(:),  pointer :: output
 +         integer :: ierr
        end function
     end interface

 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/47332>
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