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From: "david.sagan at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/95293] New: Fortran not passing array by reference
Date: Sat, 23 May 2020 20:36:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95293

            Bug ID: 95293
           Summary: Fortran not passing array by reference
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: david.sagan at gmail dot com
  Target Milestone: ---

The test program is:

program test
implicit none

type cb_struct
  real :: cbar =3D 0
end type

type scratch_struct
  type (cb_struct) :: cc(10)
  real :: zz(10) =3D 0
end type

type (scratch_struct), target :: s1

!

s1%cc(2)%cbar =3D 7
call sub2(s1%cc%cbar)
print *, 'Sub2 result:', s1%cc(2)%cbar, '  ! Wrong. Should be 10'

s1%zz(2) =3D 7
call sub3(s1%zz)
print *, 'Sub3 result:', s1%zz(2)

!--------------------------------------
contains

subroutine sub2(vec)
  real, target, intent(inout) :: vec(:)
  real, pointer :: ptr
  ptr =3D> vec(1)
  print *, 'In sub2:', associated(ptr, s1%cc(1)%cbar), vec(2)
  vec(2) =3D 23
  s1%cc(2)%cbar =3D 10
end subroutine sub2

subroutine sub3(vec)
  real, target, intent(inout) :: vec(:)
  real, pointer :: ptr
  ptr =3D> vec(1)
  print *, 'In sub3:', associated(ptr, s1%zz(1)), vec(2)
  vec(2) =3D 23
  s1%zz(2) =3D 10
end subroutine sub3

end program


Running gives:

> gfortran test.f90
> ./a.out=20
 In sub2: F   7.00000000=20=20=20=20
 Sub2 result:   23.0000000       ! Wrong. Should be 10
 In sub3: T   7.00000000=20=20=20=20
 Sub3 result:   10.0000000

I get the same result on Linux and Mac with gcc 8.3.1 and gcc 9.3.=