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Q112011: FIX: Access Violation with Pass by Value and -Ox -G3

Article: Q112011
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): kbCompiler kbFL32 kbFortranPSkbbuglist kbfixlist
Last Modified: 24-MAR-2000

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The information in this article applies to:

- Microsoft Fortran Powerstation 32 for Windows NT, version 1.0 
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SYMPTOMS
========

Using FORTRAN PowerStation for Windows NT to compile subprograms that pass
arguments by value (either by using [C] or [VALUE]) may produce an "access
violation" application error message box when compiling with both -G3 and - Ox.

CAUSE
=====

This compile-time error appears to be caused by either passing mismatched
arguments by value, or by passing expressions by value in the argument list.

RESOLUTION
==========

When using -G3 and -Ox and passing by value, always match argument lengths and
types and do not pass expressions.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft FORTRAN PowerStation
for Windows NT, version 1.0. This problem was corrected in FORTRAN PowerStation
32, version 4.0.

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

The following sample passes expressions by value, and will cause the compiler to
generate an access violation when compiling with -G3 -Ox:

Sample Code
-----------

  c Compile options needed: -G3 -Ox
  c
          subroutine s[c](rr,r4,r8,rt,rs)
          real*8 r8
          write(*,*) rr, r4, r8, rt,rs
          end

          real*8 r8 /0.d0/ 
          r4 = 0.
          rr = 0.
          rs = 0.
          rt = 0.
          call s(rr, r4,     r8,     rt, rs)
          call s(rr, r4+1.0, r8-1.0, rt, rs)
          end

Additional query words: 1.00 Dr. Watson

======================================================================
Keywords          : kbCompiler kbFL32 kbFortranPS kbbuglist kbfixlist
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword2 kbFORTRANPower32100NT
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

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