From: ike@localhost.claranet.nl   
      
   George Neuner   wrote:   
   >GCC's -O3 optimization level is widely known to cause strange problems   
   >... almost always because the program is violating assumptions made by   
   >the more advanced optimizations.   
   >   
   >The -O2 level typically is safe.  If you think you need the -O3   
   >optimizations, you should individually enable them to see if any   
   >breaks the program.  Specify -O3 only if you find they all work.   
      
   Sometimes using -O3 makes the program run slower than when using -O2.   
      
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