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Q87104: BUG: Repeated EQUIVALENCE’s Cause GP Fault During Compile

Article: Q87104
Product(s): Microsoft Fortran Compiler
Version(s): 5.1
Operating System(s): 
Keyword(s): 
Last Modified: 04-MAY-2001

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The information in this article applies to:

- Microsoft FORTRAN compiler for OS/2, version 5.1 
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SYMPTOMS
========

Code compiled with Microsoft FORTRAN 5.1 that contains repeated EQUIVALENCE
statements using the same variables may cause the compiler to generate a Trap D
protection violation during pass two of the compile.

The test case requires that the same variables be used in three different
EQUIVALENCE statements effectively equivalencing three different arrays
indirectly.

RESOLUTION
==========

Simplify EQUIVALENCE statements to directly equivalence arrays instead if
indirectly through equivalencing identical elements to the same separate
variable.

STATUS
======

Microsoft has confirmed this to be a problem in FORTRAN version 5.1. We are
researching this problem and will post new information here in the Microsoft
Knowledge Base as it becomes available.

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

The following code can be used to demonstrate the problem.

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

The following code reproduces the problem:

        CHARACTER*1 ASTDAT(70),HEDR01(70),HEDR07(70)

        EQUIVALENCE (HEDR01(1),NUMRES), (HEDR01(3),CUSIS),
       1        (HEDR01(11),CRADTS)

        EQUIVALENCE (HEDR07(1),NUMRES), (HEDR07(3),CUSIS),
       1        (HEDR07(11),PFDESS)

        EQUIVALENCE (ASTDAT(1),NUMRES), (ASTDAT(3),CUSIS),
       1        (ASTDAT(11),TICKES)

        stop
        end

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

The following code illustrates the solution:

          CHARACTER*1 ASTDAT(70),HEDR01(70),HEDR07(70)

        EQUIVALENCE (ASTDAT(1),HEDR01(1),HEDR07(1),NUMRES)
        EQUIVALENCE (HEDR01(3),CUSIS),
       1            (HEDR01(11),CRADTS,PFDESS,TICKES)
        stop
        end

Additional query words: 5.10

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Keywords          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword3 kbFORTRAN510OS2
Version           : :5.1

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