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Q108346: FIX: Substring Out of Range Hangs with -4Yb -Ox -G5

Article: Q108346
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): 
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
========

An attempt to execute a program that is compiled using the -4Yb, -Ox, and -G5
options and that contains a character substring expression out of range may
cause the application to hang.

CAUSE
=====

Compiler options -4Yb and -G5, along with the optimization (option -Ox) cause
the compiler to generate incorrect code.

RESOLUTION
==========

This problem does not occur with a different combination of options. Avoid the
-Ox optimization option, the -4Yb extended-error-handling option, or use the -G4
processor option instead of -G5.

STATUS
======

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

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

The example program below demonstrates the problem:

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

  C Compile options needed: -4Yb, -Ox and -G5

        character m*10 /'1234567890'/ 
        l = 3
        write(*,*) l ! putting this inside the loop avoids hang
        do while (m(l:l) .ne. 'Q')
        l = l + 1
        end do
        write(*,*) 'L = ', l
        write(*,*) 'M = ', m
        end

Additional query words: 1.00 lock halt

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Keywords          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword2 kbFORTRANPower32100NT
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

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