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  • Well, the builtins are a compiler instruction. You don't explicitly link to them, you make an API call (not restricted by the GPL) that happens to substitute GPL code in some cases (when you compile with GCC -- LLVM will do some of the __builtin functions). Commented Jun 15, 2012 at 3:33
  • @DavidJFelix - revised my answer based upon add'l research this AM Commented Jun 15, 2012 at 12:03