I see from the discussion in [#7942] that ARM64 support has been merged into GHC and should be available in 7.10.1. This is wonderful — and necessary for iOS development if one intends to pass through the Apple App Store, as since February new apps are rejected lest they support ARM64. However, while scripts seem to be provided in [ghc-ios-scripts] for installing binaries of GHC 7.8.3 for the iOS Simulator (i386-apple-darwin11) and actual iOS devices (arm-apple-darwin10, 32-bit ARM), the scripts for aarch64-apple-darwin14 (ARM64 on iOS devices) aren’t used by the main wrapper scripts and the installation scripts don’t appear to mention anything about installing a GHC built for ARM64 cross-compiling — indeed, it’s only 32-bit ARM via GHC 7.8.3. I can’t find any binary GHCs on the [downloads] either. Building GHC from source for cross-compiling to ARM64 is currently failing for me probably due to some trivial issue with my build environment. «./configure» says: checking version of gcc... configure: error: Need at least gcc version 3.0 (3.4+ recommended) That’s configuring with ./configure --target=aarch64-apple-darwin14 --with-gcc=aarch64-apple-darwin14-clang Furthermore, $ gcc -v Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn) Target: x86_64-apple-darwin14.3.0 Thread model: posix $ aarch64-apple-darwin14-clang aarch64-apple-darwin14-clang: line 7: /usr/local/opt/llvm/bin/clang: No such file or directory aarch64-apple-darwin14-clang: line 7: exec: /usr/local/opt/llvm/bin/clang: cannot execute: No such file or directory Note the [aarch64-apple-darwin14-clang] command I’m running there is the script from [ghc-ios-scripts], which seems overly simplistic compared to the same script for ARMv7 GHC-iOS: https://github.com/ghc-ios/ghc-ios-scripts/blob/master/arm-apple-darwin10-cl... I suppose the solution might even be as simple as installing an adequate version of LLVM+Clang over there at «/usr/local/opt/llvm» which the commands seem to be looking for — but which version might be appropriate? Moreover, is there some guide on how to install what needs to be installed? The ghc-ios scripts get 3.0, yet some Trac comments seem to suggest some very recent version of LLVM, possibly 3.6 or maybe just the latest development version. Is this even something people have working? [#7942]: https://ghc.haskell.org/trac/ghc/ticket/7942 [ghc-ios-scripts]: https://github.com/ghc-ios/ghc-ios-scripts [aarch64-apple-darwin14-clang]: https://github.com/ghc-ios/ghc-ios-scripts/blob/master/aarch64-apple-darwin1... [downloads]: https://downloads.haskell.org/~ghc/7.10.1/