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Q104859: FIX: $STORAGE:2 or /4I2 Generates Incorrect Code

Article: Q104859
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): 
Last Modified: 24-MAR-2000

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft FORTRAN PowerStation for MS-DOS, version 1.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Using the undocumented compiler option /4I2 or the equivalent undocumented
metacommand $STORAGE:2 will:

- Miscalculate integer array sizes for DATA statements

- Interpret explicitly declared INTEGER*4 variables as INTEGER*2

RESOLUTION
==========

The compiler option /4I2 and the metacommand $STORAGE:2 are not intended to be
used with this compiler. They are not documented for the same reason. However,
any erroneous behavior may be avoided by replacing every instance of "integer "
with "integer*2 " and declaring

     implicit integer*2 (i-n)

at the very beginning of each subroutine.

It is necessary to replace every instance of "integer " with "integer*2 " because
explicit integer declarations are treated as integer*4.

STATUS
======

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

MORE INFORMATION
================

Sample Code 1
-------------

  C Compile options needed: none (or comment out line 1 and use: /4I2)
  $storage:2
        integer iunit(3)
        data iunit/100,10,1/ 
        print*, iunit
        end
  C This will generate the following error:
  C   F2408: IUNIT : DATA : too few constants to initialize item

Sample Code 2
-------------

  C Compile options needed: none (or comment out line 1 and use: /4I2)
  $storage:2
        integer*4 i,j
        j = 30000
        i = j*j
        print*, i,j
        end
  C When run, this will give the following wrong result:
  C   -5888    30000
  C instead of the following correct result:
  C   900000000    30000

FORTRAN PowerStation version 1.0 can be differentiated from the maintenance
release version 1.0a by invoking the linker. Typing "link32 | more" (without the
quotation marks) 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          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword3 kbFORTRANPower100DOS
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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