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Date: Sat, 04 Jul 2009 07:50:00 -0000
Subject: [Bug fortran/40646]  New: ICE assigning array return value from type-bound  procedure
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Reported by Charlie Sharpsteen at
  http://gcc.gnu.org/ml/fortran/2009-07/msg00010.html

The program runs with NAG f95 5.1 and prints twice:
   1.0000000000000000   1.0000000000000000   1.0000000000000000   
   1.0000000000000000

With gfortran:
  aaa.f90: In function 'bugtest':
  aaa.f90:30:0: internal compiler error: Segmentation fault

valgrind shows:
==17749== Invalid read of size 1
==17749==    at 0x56D412: gfc_return_by_reference (trans-types.c:2089)
==17749==    by 0x550D88: gfc_trans_assignment (trans-expr.c:4412)

which is:
  2087  gfc_return_by_reference (gfc_symbol * sym)
  2088  {
  2089    if (!sym->attr.function)
  2090      return 0;


! Testcase by Charlie Sharpsteen
module bugTestMod
implicit none
  type:: boundTest
  contains
    procedure, nopass:: test => returnMat
  end type boundTest
contains
  function returnMat( a, b ) result( mat )
    integer:: a, b
    double precision, dimension(a,b):: mat 
    mat = 1d0
  end function returnMat
end module bugTestMod

program bugTest
  use bugTestMod
  implicit none
  double precision, dimension(2,2):: testCatch
  type( boundTest ):: testObj
  write(*,*)testObj%test(2,2)  ! <<<< OK (at run time)
  testCatch = testObj%test(2,2)! <<<< ICE
  write(*,*)testCatch
end program bugTest


-- 
           Summary: ICE assigning array return value from type-bound
                    procedure
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40646