GHC needs bootstrapping on Aarch64

[Riku Voipio]

GNU haskell (GHC) should be ported and bootstrapped for Aarch64.

Since GHC uses itself to build, it needs a bit of manual wedging for the first succesfull build:

https://ghc.haskell.org/trac/ghc/wiki/Building/Porting

http://www.haskell.org/ghc/docs/6.4.2/html/building/sec-porting-ghc.html

These steps would allow a large amount haskell modules to build on Aarch64

[Colin Watson (cjwatson)]

This is now bootstrapped in trusty, after a bit of a porting saga. Let me know whether you think that's sufficient for this bug, or whether you want to repurpose it for more sophisticated GHC enablement on arm64 (e.g. GHCi, LLVM or native code generation, etc.).

[Riku Voipio (riku-voipio)]

Thanks, Colin!

GHCi and native code are IIRC missing from arm32 port well. Unless there is a popular usecase that requires ghci or higher performance from llvm/native code generation, those features will probably remain in low priority in backlog.