PRB: H2INC Does Not Handle #undef

Last reviewed: January 9, 1995
Article ID: Q120068

The information in this article applies to:

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

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 reference words: 6.10 6.11
KBCategory: kbtool kbprb
KBSubCategory: tlsMisc

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: January 9, 1995
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.