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C:\test\junk>dir /w a b
 Volume in drive C has no label.
...
[.]  [..]
               0 File(s)              0 bytes
               2 Dir(s)  15,859,965,952 bytes free

C:\test\junk>type makefile
all:
    xcopy /f /r /i /e /d a\*.* b\*.*

C:\test\junk>nmake all

...

        xcopy /f /r /i /e /d a\*.* b\*.*
0 File(s) copied

C:\test\junk>nmake all

...
Invalid switch - /b
NMAKE : fatal error U1077: 'xcopy' : return code '0x4'
Stop.