[MacPorts] #15514: reinplace should warn if nothing got replaced

[MacPorts]

#15514: reinplace should warn if nothing got replaced
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  Reporter:  ryandesign at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement              |      Status:  new                                  
  Priority:  Normal                   |   Milestone:  MacPorts base enhancements           
 Component:  base                     |     Version:  1.6.0                                
Resolution:                           |    Keywords:                                       
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Comment (by raimue at macports.org):

 Not sure if it is faster or better than `diff -q`, but `cmp -s $file
 $tmpfile` returns as exit value if two files differ, without any output on
 stdout (getting rid of `>/dev/null`).

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Ticket URL: <http://trac.macports.org/ticket/15514#comment:6>
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