Article ID: 51608
Article Last Modified on 12/1/2003
APPLIES TO
- Microsoft FORTRAN Compiler 4.1
- Microsoft FORTRAN Compiler 5.0
- Microsoft FORTRAN Compiler 5.1
- Microsoft FORTRAN Compiler 4.1
- Microsoft FORTRAN Compiler 5.0
- Microsoft FORTRAN Compiler 5.1
This article was previously published under Q51608
SYMPTOMS
Compiling an application in OS/2 fails and a protection violation occurs. An attempt to compile the same application in MS-DOS fails and the compiler generates the appropriate message below. For FORTRAN version 5.1:
For FORTRAN versions 4.1 and 5.0:
CAUSE
The application contains an executable statement that refers to a variable that is used later as a formal parameter in an ENTRY statement but not as a formal argument in a SUBROUTINE statement. FORTRAN does not support this practice.
RESOLUTION
To avoid this error, declare each variable used in an executable statement as a formal argument in a SUBROUTINE statement.
STATUS
Microsoft has confirmed this to be a problem in FORTRAN versions 4.1, 5.0, and 5.1. This problem was corrected in FORTRAN PowerStation, version 1.0.
MORE INFORMATION
FORTRAN does not support using a variable in an executable statement if it does not appear in a SUBROUTINE statement. The fourth paragraph on page 163 in the Microsoft FORTRAN "Reference" manual for versions 5.0 and 5.1 includes the following statement:
A formal argument cannot appear in an executable statement that occurs before the ENTRY statement containing the formal argument unless the formal argument also appears in a FUNCTION, SUBROUTINE, or ENTRY statement that precedes the executable statement.
The next-to-last paragraph on page 208 of the Microsoft FORTRAN "Language Reference" manual for version 4.1 contains similar information.
FORTRAN PowerStation correctly generates the error:
The following code example demonstrates this problem.
Sample Code #1
C Compile options needed: None
A = 100.0
CALL SETPT (A)
CALL FRSTC
STOP
END
SUBROUTINE FRSTC
WRITE (*, *) B ! b in an executable statement
RETURN
ENTRY SETPT (B) ! b as formal parameter (for first time)
RETURN
END
If the application declares "B" as a formal parameter for the FRSTC subroutine, the program compiles without any errors.
Sample Code #2
A = 100.0
CALL SETPT (A)
CALL FRSTC (A)
STOP
END
SUBROUTINE FRSTC (B)
WRITE (*, *) B
RETURN
ENTRY SETPT (B)
RETURN
END
Additional query words: 4.10 5.00 5.10 buglist4.10 buglist5.00 buglist5.10 fixlist1.00
Keywords: kbfix KB51608
