All, It needs work yet, but I've got a GHC "toolchain" cross compiler working, with an ARM linux target. This is an important step in making a new GHC-iPhone cross compiler. The patches against GHC HEAD are here: http://hip-to-be-square.com/~blackh/ghc-cross/ For ARM targets, you need llvm version 3.0 or greater (thanks to me, Karel Gardas and David Terei). If it hasn't been released yet when you read this, rc3 (which works for my ARMv5 target) can get got from: http://llvm.org/pre-releases/3.0/ Incidentally, Ben Gamari is working on ghc linker support, which means that ghci and runhaskell will work on ARM. Template Haskell might be trickier, though, so it isn't supported for now in cross compilers. "Cross compiling" with reference to GHC now means two things: 1. Porting GHC: If you want to port local-compiling GHC to a new platform, do ./configure --host=arm-ldu-linux-gnueabi 2. My meaning - building a toolchain: To build a compiler that runs locally but builds for a foreign platform, do ./configure --target=arm-ldu-linux-gnueabi I'll make sure I document this somewhere. NOTES: This patch assumes that the GNU convention is followed, that all the cross-compiling tools are prefixed with the target name, e.g. arm-ldu-linux-gnueabi-ld. iPhone doesn't follow this but I propose to fix this with a directory full of symlinks. 'alien' is a script you have to provide to allow foreign code to be run locally. This is required for a couple of things now, but (as Duncan Coutts pointed out) this could probably ultimately be eliminated, using the autotools AC_COMPUTE_INT technique (which interrogates the compiler directly). Following the convention of the Linux kernel, in these patches, Cabal uses an environment variable called CROSS_COMPILE to supply a prefix for all compile tools at runtime. The idea is that ghc and ghc-pkg's executable names will also be prefixed with the target name. You would use that in combination with PATH to switch between Cabal working for a local compiler or for cross-compiling. Steve ON PC: blackh@amentet:~/src/ghc$ inplace/bin/ghc-stage1 --version The Glorious Glasgow Haskell Compilation System, version 7.3.20111107 blackh@amentet:~/src/ghc$ inplace/bin/ghc-stage1 pidigits.hs [1 of 1] Compiling Main ( pidigits.hs, pidigits.o ) Linking pidigits ... blackh@amentet:~/src/ghc$ scp pidigits root@192.168.1.129: root@192.168.1.129's password: pidigits 100% 9664KB 2.4MB/s 00:04 blackh@amentet:~/src/ghc$ ON TARGET MACHINE (QEMU) root@ldu:~# uname -a Linux ldu 2.6.37-versatile #2 Tue Oct 18 12:00:46 NZDT 2011 armv5tejl GNU/Linux root@ldu:~# ./pidigits 1000 3141592653 :10 5897932384 :20 6264338327 :30 9502884197 :40 1693993751 :50 0582097494 :60 4592307816 :70 4062862089 :80 9862803482 :90 5342117067 :100 9821480865 :110 1328230664 :120 7093844609 :130 5505822317 :140 2535940812 :150 8481117450 :160 2841027019 :170 3852110555 :180 9644622948 :190 9549303819 :200 6442881097 :210 5665933446 :220 1284756482 :230 3378678316 :240 5271201909 :250 1456485669 :260 2346034861 :270 0454326648 :280 2133936072 :290 6024914127 :300 3724587006 :310 6063155881 :320 7488152092 :330 0962829254 :340 0917153643 :350 6789259036 :360 0011330530 :370 5488204665 :380 2138414695 :390 1941511609 :400 4330572703 :410 6575959195 :420 3092186117 :430 3819326117 :440 9310511854 :450 8074462379 :460 9627495673 :470 5188575272 :480 4891227938 :490 1830119491 :500 2983367336 :510 2440656643 :520 0860213949 :530 4639522473 :540 7190702179 :550 8609437027 :560 7053921717 :570 6293176752 :580 3846748184 :590 6766940513 :600 2000568127 :610 1452635608 :620 2778577134 :630 2757789609 :640 1736371787 :650 2146844090 :660 1224953430 :670 1465495853 :680 7105079227 :690 9689258923 :700 5420199561 :710 1212902196 :720 0864034418 :730 1598136297 :740 7477130996 :750 0518707211 :760 3499999983 :770 7297804995 :780 1059731732 :790 8160963185 :800 9502445945 :810 5346908302 :820 6425223082 :830 5334468503 :840 5261931188 :850 1710100031 :860 3783875288 :870 6587533208 :880 3814206171 :890 7766914730 :900 3598253490 :910 4287554687 :920 3115956286 :930 3882353787 :940 5937519577 :950 8185778053 :960 2171226806 :970 6130019278 :980 7661119590 :990 9216420198 :1000 root@ldu:~#