title: Passing C/C++ #defines to makefile
body: <p>I develop C/C++ using the Eclipse IDE. Eclipse also generates a makefile which I don't want to edit as it will simply be overwritten.</p>
  
  <p>I want to use that makefile for nightly build within Hudson.</p>
  
  <p>How do I pass #defines which are made in the project file of the IDE to the makefile ?  (and why doesn't Eclipse already include them in the generated makefile?)</p>
  
  <p>I actually had this figured out once, then accidentally overwrote it :-(   But at least I know that it can be done...</p>