Very strange. If I download Cabal from hackage and build it with 'cabal build' the bloat disappears. cabal build: 18M HSCabal-1.22.2.0-HWT8QvVfJLn2ubvobpycJY.o 21M libHSCabal-1.22.2.0-HWT8QvVfJLn2ubvobpycJY.a /usr/local/lib/ghc-7.10.1: 23M HSCabal-1.22.2.0-HWT8QvVfJLn2ubvobpycJY.o 53M libHSCabal-1.22.2.0-HWT8QvVfJLn2ubvobpycJY.a This is my build.mk: SRC_HC_OPTS = -O -H64m GhcRTSWays = thr HADDOCK_DOCS = NO GhcHcOpts = GhcLibWays = v DYNAMIC_GHC_PROGRAMS = NO This is the same as I used for 7.8 without issue, except the addition of GhcHcOpts (because 7.8 ignored the default). -- View this message in context: http://haskell.1045720.n5.nabble.com/Binary-bloat-in-7-10-tp5768067p5768133.... Sent from the Haskell - Glasgow-haskell-users mailing list archive at Nabble.com.