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

ID: Q104859

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 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 :