Knowledge Base

BUG: Compiling With -4Ya -Ox -4fps1 Causes Stack Corruption

PSS ID Number: 147760

Article Last Modified on 11/2/1999

The information in this article applies to:

This article was previously published under Q147760

SYMPTOMS

An application that is compiled with the -4Ya -Ox -4fps1 compiler switches together causes stack data corruption at run time.

CAUSE

Multiple variables are being assigned to the same stack location.

RESOLUTION

Don't use these compiler switches together.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. 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 illustrates the problem:

Sample Code

C Compile options needed: -4Ya -Ox -4fps1

      INTEGER NUMBER, DIVSOR, QUOT, REM
      NUMBER = 5
      DIVSOR = 2
      CALL DIVIDE (NUMBER, DIVSOR, QUOT, REM)

      PRINT *, 'Quotient : ', QUOT
      PRINT *, 'Remainder: ', REM
      END

      SUBROUTINE DIVIDE (NUMBER,DIVSOR,QUOT,REM)
      INTEGER NUMBER, DIVSOR, QUOT, REM, Q
      Q = NUMBER/DIVSOR
      REM = NUMBER-DIVSOR*Q
      QUOT = Q
      END
The following program output is produced at run time: 
Quotient :           1
Remainder:           0
The correct output should be: 
Quotient :           2
Remainder:           1

Additional query words: 4.00

Keywords: kbLangFortran KB147760
Technology: kbAudDeveloper kbFORTRANPower400NT kbFortranSearch kbZNotKeyword8


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