gcc/libgomp/testsuite/libgomp.oacc-fortran/routine-3.f90

! { dg-do run }
! { dg-options "-fno-inline" }

  integer, parameter :: n = 10
  integer :: a(n), i
  integer, external :: fact
  !$acc routine (fact)
  !$acc parallel
  !$acc loop
  do i = 1, n
     a(i) = fact (i)
  end do
  !$acc end parallel
  do i = 1, n
     if (a(i) .ne. fact(i)) STOP 1
  end do
end
recursive function fact (x) result (res)
  !$acc routine
  integer, intent(in) :: x
  integer :: res
  if (x < 1) then
     res = 1
  else
     res = x * fact (x - 1)
  end if
end function fact