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! { dg-do run }

! { dg-options "-fmax-subrecord-length=16" }

! Test Intel record markers with 16-byte subrecord sizes.

program main

  implicit none

  integer, dimension(20) :: n

  integer, dimension(30) :: m

  integer :: i

  real :: r

  integer :: k

  ! Maximum subrecord length is 16 here, or the test will fail.

  open (10, file="f10.dat", &

       form="unformatted", access="sequential")

  n = (/ (i**2, i=1, 20) /)

  write (10) n

  close (10)

  ! Read back the file, including record markers.

  open (10, file="f10.dat", form="unformatted", access="stream")

  read (10) m

  if (any(m .ne. (/ -16, 1, 4, 9, 16, 16, -16, 25, 36, 49, 64, &

       -16, -16, 81, 100, 121, 144, -16, -16, 169, 196, 225, &

       256, -16, 16, 289, 324, 361, 400, -16 /))) call abort

  close (10)

  open (10, file="f10.dat", form="unformatted", &

       access="sequential")

  m = 42

  read (10) m(1:5)

  if (any(m(1:5) .ne. (/ 1, 4, 9, 16, 25 /))) call abort

  if (any(m(6:30) .ne. 42)) call abort

  backspace 10

  n = 0

  read (10) n(1:5)

  if (any(n(1:5) .ne. (/ 1, 4, 9, 16, 25 /))) call abort

  if (any(n(6:20) .ne. 0)) call abort

  ! Append to the end of the file

  write (10) 3.14

  ! Test multiple backspace statements

  backspace 10

  backspace 10

  read (10) k

  if (k .ne. 1) call abort

  read (10) r

  if (abs(r-3.14) .gt. 1e-7) call abort

  close (10, status="delete")

end program main