Microsoft KB Archive/79829

= FIX: /Zm and $-Constant Produces A2075 in MASM 6.0 =

Article ID: 79829

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition

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This article was previously published under Q79829



SYMPTOMS
In the Microsoft Macro Assembler (MASM) version 6.0, the following error message may be produced

A2075: jump destination too far : by xxxxx byte(s)

when using the /Zm option, the MASM driver with MASM 6.0, or OPTION M510. When MASM 5.1 compatibility is not used or MASM 5.1 is used, the code assembles correctly.



CAUSE
This behavior is caused by using the current address operator, $, minus a constant (for example, jmp $-5), and the MASM driver with MASM 6.0, OPTION M510, or the /Zm switch when assembling.



RESOLUTION
Use a label instead of the current address operator or assemble without the MASM 5.1 switch.



STATUS
Microsoft has confirmed this to be a problem in MASM version 6.0. This problem was corrected in MASM version 6.0a.



MORE INFORMATION
The /Zm switch is the MASM 5.1 compatibility switch in MASM 6.0. The MASM driver calls ML with the /Zm option in MASM 6.0. OPTION M510 is a directive that specifies MASM 5.1 compatibility.

Sample Code
; Assembly options need: /Zm

DOSSEG .MODEL small .STACK 4096 .DATA .CODE start: mov     al,5h here:  dec     al        jnz     $-2             ; This line causes the A2075 error. ;jnz   here            ; Uncomment this line and comment out mov    ax,4c00h        ; jnz $-2 to get the code to assemble int    21h             ; correctly. END    start

Additional query words: 6.00 5.10 buglist6.00 fixlist6.00a

Keywords: kbfix KB79829

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