Precedence in Macro Definitions

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If a macro has multiple definitions, NMAKE uses the highest-precedence definition. The following list shows the order of precedence, from highest to lowest:

1. A macro defined on the command line
   
   
2. A macro defined in a makefile or include file
   
   
3. An inherited environment-variable macro
   
   
4. A macro defined in the Tools.ini file
   
   
5. A predefined macro, such as CC and AS

Use /E to cause macros inherited from environment variables to override makefile macros with the same name. Use !UNDEF to override a command line.