BUG: Error A2005 Generated Due to Conflict with Global Label

• Microsoft Macro Assembler (MASM) for MS-DOS, versions 6.1 and 6.11
• Microsoft MASM for Windows NT, version 6.11

SYMPTOMS

According to page 354 of the "MASM 6.1 Programmer's Guide," labels within a procedure that are defined with a single colon are local, provided there is a language specifier on the .Model statement. However, if the symbol used for a local label appears as a global label in an earlier part of the source file, the following error is generated during assembly:

   A2005: symbol redefinition

RESOLUTION

If possible, rearrange the code so that the global label does not appear before the local label.

STATUS

Microsoft has confirmed this to be a bug in MASM versions 6.1 and 6.11. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following sample code can be used to demonstrate the problem. If "two proc" were placed after "one proc", there would be no assembly errors and the "jmp two" would cause a jump to the local label "two".

Sample Code

; Assemble options needed: none

   .model small, C
   .code

   two proc
      ret
   two endp

   one proc

      jmp two
      nop

   two:            ; error A2005: symbol redefinition : two

   one endp
   end