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

ID: Q102695

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

The following code example demonstrates the correct method to declare an array in this manner:

Sample Code 2


C Compiler options needed: -4Yb -4Ys

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

FORTRAN PowerStation version 1.0 can be differentiated from the maintenance release version 1.0a by invoking the linker. Typing link32 | more from \F32\BIN directory will show version 2.8 for FORTRAN PowerStation version 1.0, and it will show version 1.0f for the maintenance release version 1.0a.

Additional query words: 1.00 buglist1.00 fixlist1.00a

Keywords :
Version : :1.0
Platform :
Issue type :