NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
!ERROR, !MESSAGE Directives
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     Syntax:  !ERROR text
 
     Displays <text> in the message for error U1050, then stops the
     NMAKE session. Spaces or tabs before <text> are ignored. U1050 and
     other errors are displayed to standard error.
 
     !ERROR stops the build even if any of the following are used:
 
          !CMDSWITCHES Directive
          Dash (-) Modifier
          .IGNORE Directive
          /I Option
          /K Option
 
     Syntax:  !MESSAGE text
 
     Displays <text> to standard output, then continues the NMAKE
     session. Spaces or tabs before <text> are ignored.
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