On MacOS, build.sh installs arithmoi without llvm

[FranklinChen]

Add constraint on cabal install for MacOS to not use LLVM for arithmoi, addressing a known problem:

https://bitbucket.org/dafis/arithmoi/issue/15/fails-to-compile-with-ghc-784-due-to-fllvm

http://stackoverflow.com/questions/24796874/cant-install-diagrams-arithmoi-on-mac

[gibiansky]

Do you mean -fllvm? -llvm I think is enabled by default already, no? (I might be misreading things...)

[FranklinChen]

cabal install --constraint "arithmoi -llvm" ... is correct.

cabal install 'arithmoi==0.4.*' -f -llvm for installing just arithmoi is also correct.

By the way, just a few seconds ago I finally completed a fully automated install of IHaskell on Mac OS on a fresh machine. It was quite involved (since my normal machines had a lot of state already from fiddling around with things) but I got it working and will verify it by wiping everything and running my script.

Right now I have the setup do various things before finally calling ./build.sh all and ./build.sh display. Should I just submit this wrapper script as a specific mac-build-everything.sh or something like that?

[gibiansky]

Sounds good. Yes, wrapper script sounds good -- that said, make sure there is good documentation about what the script does (even if just as comments in the script), because as a user, I would be afraid of running such a script, given that it has to do a lot of things (install native libs, etc).