NMAKE Help (nmake.hlp) (Table of Contents; Topic list)
/Q Option
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     Syntax:  /Q
 
     Checks time stamps of targets that would be updated by the build
     but does not run the build. NMAKE returns a zero exit code if the
     targets are up-to-date and a nonzero exit code if any target is
     out-of-date. Only preprocessing commands are executed. This option
     is useful when running NMAKE from a batch file.
     See: NMAKE Exit Codes
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