Hi all! I spottes these warnings in today's $ make INTEGER_LIBRARY=integer-simple V=0 build: rts/Stats.c: In function 'stat_exit': rts/Stats.c:695:0: warning: format '%16zu' expects type 'size_t', but argument 2 has type 'unsigned int' rts/sm/Storage.c: In function 'flushExec': rts/sm/Storage.c:1294:0: warning: implicit declaration of function '__builtin___clear_cache' rts/sm/Storage.c:1294:0: warning: nested extern declaration of '__builtin___clear_cache' this is my "GCC": ggreif$ gcc --version i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Cheers, Gabor PS: there is also this low-hanging fruit: libraries/containers/Data/IntSet/Base.hs:1196:17: Warning: In the use of 'bitSize' (imported from Data.Bits): Deprecated: "Use bitSizeMaybe or finiteBitSize instead"