Editing MuniHac2016/Projects (section)

== ghc-mod: make using different compiler versions across projects easier ==

'''Required skill level''': Expert

https://github.com/DanielG/ghc-mod/issues/615, https://hackage.haskell.org/package/rts-loader#readme

One of the major problems with ghc-mod is the fact that we directly link against
the GHC API library which essentially means we can only support one GHC version
per ghc-mod installation. Since ghc-mod now supports Stack this has become a
much larger problem since GHC version changes are now transparent to users.

There are two approaches to solving this that we're considering: Either we
(re)compile the ghc-mod executable at runtime against the GHC version we detect
the project to be using or we use some dynamic linker voodoo. I've been
prototyping a way to do the latter (see rts-loader package on Hackage) but it's
not clear yet if this is a good idea or not.