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

The information in this article applies to:

• Microsoft FORTRAN PowerStation for Windows NT, version 1.0

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