FIX: Public Labels Are Prefixed with Underscore Incorrectly

• Microsoft Macro Assembler for MS-DOS, version 5.1
• Microsoft Macro Assembler for OS/2, version 5.1

SYMPTOMS

If you assemble the following program with MASM version 5.1 and examine the public label, TheProc, you will find an underscore prefixed to it. Another symptom of the problem may occurs during link time. The linker will generate the error L2029 unresolved external on public labels.

CAUSE

The space before the comma in the structure initialization of Data1 causes the problem to occur.

RESOLUTION

Removing the space before the comma in the structure initialization of Data1 will allow you to work around the problem.

STATUS

Microsoft has confirmed this to be a problem in MASM version 5.1. This problem was corrected in MASM version 5.1a.

Sample Code

; Assemble options needed: none

StrucType STRUC
Label1  DB "LPT"
Label2  DB "   "
StrucType ENDS

_DATA SEGMENT
Data1   StrucType < , "1">
_DATA ENDS

_TEXT SEGMENT
ASSUME CS:_TEXT, DS:_DATA
PUBLIC TheProc

TheProc PROC NEAR
        mov ax, 4C00h
        int 21h
TheProc ENDP
_TEXT ENDS

END 

Additional query words: 5.10 buglist5.10 fixlist5.10a

Keywords :
Version : :5.1
Platform :
Issue type :