Microsoft KB Archive/147760

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

PSS ID Number: 147760

Article Last Modified on 11/2/1999

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The information in this article applies to:


 * Microsoft Fortran PowerStation for Windows 95 and Windows NT 4.0

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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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