Merged revisions 11878,11881-11882,11889,11891-11893,11895,11899-11902,11935,11938,12212,12304,12308-12310,12316,12330-12332,12334,12339-12340 via svnmerge from 
svn+ssh://jonas@svn.freepascal.org/FPC/svn/fpc/branches/wpo

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r11878 | jonas | 2008-10-11 02:25:18 +0200 (Sat, 11 Oct 2008) | 19 lines

  + initial implementation of whole-program optimisation framework
  + implementation of whole-program devirtualisation
  o use:
     a) generate whole-program optimisation information (no need
        to completely compile the program and all of its units
        with -OW/-FW, only the main program is sufficient)
      fpc -OWdevirtcalls -FWmyprog.wpo myprog
     b) use it to optimise the program
      fpc -B -Owdevirtcalls -Fwmyprog.wpo myprog
     (the -B is not required, but only sources recompiled during
      the second pass will actually be optimised -- if you want,
      you can even rebuild the rtl devirtualised for a particular 
      program; and these options can obviously also be used         ...