KB120068 - PRB: H2INC Does Not Handle #undef

Article ID: 120068

Article Last Modified on 2/11/2004

Microsoft Macro Assembler 6.1 Standard Edition
Microsoft Macro Assembler 6.11 Standard Edition

This article was previously published under Q120068

SYMPTOMS

The H2INC utility does not appear to handle #undef correctly. For example, the following code fragment causes "error A2005: symbol redefinition: test2" to appear:

   #define test2  2
   #if test2 == 2
      #undef test2
      #define test2 3
   #endif

CAUSE

This behavior is by design.

The following .INC file is generated for the fragment listed in the "SYMPTOMS" section:

    option expr32
    option casemap:none

    ; Begin of file xxx.h
    test2          EQU          2t
    test2          EQU          3t
    ; End of file xxx.h

NOTE: In MASM, constants defined with EQU cannot be redefined.

RESOLUTION

A #define can define "text equates" as well as "numeric equates." In the case of numeric constants, use an editor to change the "EQU" to a "=".

Additional query words: 6.10 6.11

Keywords: KB120068