FIX: F2559, DX1020 From Illegal Array Bound, -4Yb, and -4Ys

The information in this article applies to:

• Microsoft FORTRAN PowerStation for MS-DOS, version 1.0

SYMPTOMS

An attempt to compile an application may fail and Microsoft FORTRAN PowerStation may generate the following messages:

   error F2559: array bound used illegal variable
   DOSXNT : fatal error DX1020: unhandled exception:
      General protection fault

CAUSE

The application declares an array using an initialized INTEGER variable as an array bound and refers to that array using an INTEGER as a subscript. The compile command line includes both the -4Yb and -4Ys option switches.

The General Protection Fault occurs because the array has an illegal array bound.

RESOLUTION

Modify the source code to define the array bound in a PARAMETER statement before using it in the array declaration or declare the array using an integer constant.

STATUS

Microsoft has confirmed this to be a problem in FORTRAN PowerStation version 1.0 for MS-DOS. This problem has been resolved with FORTRAN PowerStation maintenance release version 1.0a for MS-DOS.

MORE INFORMATION

The following code example demonstrates this problem:

Sample Code 1

C Compiler options needed: -4Yb -4Ys

      real x(n)
      i = 1
      x(i) = 1.0
      end

Sample Code 2

C Compiler options needed: -4Yb -4Ys

      parameter (n = 10)
      real x(n)
      i = 1
      x(i) = 1.0
      end