From: Jatin_Bhateja@mentor.com   
      
   Hi  Michiel,   
      
    >I propose that in addition to comparing modification dates, we selectively   
    >compare AST's (if the source file is newer). At the very least this allows   
    >the programmer to modify style, layout and comments without requiring any   
    >recompilation at all. If the comparison utility is smart enough, you may   
    >even perform trivial refactoring without losing semantic equivalence.   
      
   As per your thought programmer can make cosmetic changes like changing   
   the comments / spaces / tabs / new lines,   
   any such cosmetic change will not lead to re-compilation. How are you   
   going to keep the line number info updated ?   
   It needed by source debugger to refer to correct source line analogous   
   to current assembly/machine instruction .   
      
   --   
   Thanks and Regards   
   Jatin Bhateja   
      
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