This is an important change for people using the DEBUG macro (which should be all of you :). The critical piece is that you now need to #include "Support/Debug.h" to get access to DEBUG, not "Support/Statistic.h". In addition to this change, you can now make the DEBUG output much more fine-grained than before. For details, consult the programmer's guide: http://llvm.cs.uiuc.edu/docs/ProgrammersManual.html#DEBUG_TYPE This feature was requested by Misha, because whenever he enabled -debug in the code generator, he got all kinds of debug output from all of the different components of it. Now he can classify debug output into different types, and only turn on subsets of the information. Enjoy, -Chris -- http://llvm.cs.uiuc.edu/ http://www.nondot.org/~sabre/Projects/