Fix-Up Overflow Caused By Extrn Statements and .Fardata

The information in this article applies to:

• Microsoft Macro Assembler for MS-DOS, version 5.1

SUMMARY

The following assembler modules produce a fix-up overflow error message during linking.

When linking these two modules together, the .fardata-simplified segment directive will cause a link-error fix-up overflow.

Every module with a .fardata segment is defining a different .fardata segment. The linker will keep the segments separate. Therefore, declaring the fvar variable external in module 2 generates the problem. The extrn far data item, fvar, should be declared outside the .fardata segment.

MORE INFORMATION

Module 1

.model large .stack .data public gvar .fardata public fvar fvar db 55h

.code extrn t2:proc start: mov ax,@DATA

       mov ds,ax
       mov ax,@FARDATA
       mov es,ax

       call dword ptr t2

Module 2

.model large .data extrn gvar:byte .fardata extrn fvar:byte

.code

    public t2
t2  proc   far
    mov bl, es:fvar
    ret FAR

    end