NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
NMAKE Exit Codes
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     NMAKE returns an exit code to the operating system or the calling
     program. A value of 0 indicates execution of NMAKE with no errors.
     Warnings return exit code 0.
 
     Code      Meaning
 
     0         No error
 
     1         Incomplete build; issued only when /K is used
               See: /K Option
 
     2         Program error, possibly due to one of the following:
 
                  ■ A syntax error in the makefile
                  ■ An error or exit code from a command
                  ■ An interruption by the user
 
     4         System error; out of memory
 
     255       Target is not up-to-date; issued only when /Q is used
               See: /Q Option
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