[Bug fortran/37199] array assignment from function writes out of bounds

[dominiq at lps dot ens dot fr]

------- Comment #2 from dominiq at lps dot ens dot fr  2008-08-22 10:56 -------
Confirmed on i686-apple-darwin9 (both 32 and 64 bit modes). Compiling the test
with -fbounds-check gives at run time:

At line 18 of file pr37199.f90
Fortran runtime error: Array bound mismatch for dimension 1 of array 'pxq'

The modified test

program bounds_issue
  implicit none
  integer, parameter  :: dp = kind(1.0d0)
  real(dp), pointer :: pdf0(:,:), dpdf(:,:)

  allocate(pdf0(0:282,-6:7))
  allocate(dpdf(0:282,-6:7))  ! with dpdf(0:283,-6:7) [illegal] error
disappears
  write(*,*) lbound(dpdf), ubound(dpdf)
  pdf0 = 1.0d0
  dpdf = 0.0d0
  dpdf = tmp_PConv(pdf0)
  if (any(dpdf /= pdf0)) call abort()

contains
  function tmp_PConv(q_in) result(Pxq)
    real(dp),      intent(in) :: q_in(0:,-6:)
    real(dp)                  :: Pxq(0:ubound(q_in,dim=1),-6:7)
    Pxq = 0d0
    write(*,*) lbound(q_in), ubound(q_in)
    write(*,*) lbound(Pxq),  ubound(Pxq)
    Pxq = q_in
    return
  end function tmp_PConv

end program bounds_issue

gives at run time

           0          -6         282           7
           0          -6         282           7
           0          -6         282           7

and does not abort, suggesting that the copy has been properly done. It looks
like as another "off by one" issue(?).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37199