Being able to change ghc install directory

Hi! I am adding jobs using chocolatey, ghc and cabal in haskell-ide-engine.
The default install dir of ghcs is the relative to choco install and afaiu it is fixed (correct me if i am wrong).

GhcChoco/8.8.2/ghc/tools/chocolateyInstall.ps1

Line 25 in 110d469

$binRoot = $(Split-Path -parent $MyInvocation.MyCommand.Definition)

Being able to change the directory could help to:

Install to another drive if the default one (typically C:) is almost full (the case of azure pipelines agent and the main reason to open this)
Install to paths inside msys/mingw to reuse environment variables and scripts between linux and windows
- You could download to /opt/ghc/$GHC_VERSION/bin and match the default install dir for several linux default installations

@Mistuke : this is not a big deal but i think it could be handy

I'll look into this for the 8.10 release. Shouldn't be that hard... Though I thought you could already do this by changing your choco install location but that seems to be a premium feature.

Install to paths inside msys/mingw to reuse environment variables and scripts between linux and windows

I would be careful mixing msys things with it native applications.. the loader may load something incorrectly

So there is one problem with allowing people to do this. If the path is changed to something that contains spaces in it a lot of the tooling can't deal with it. like configure scripts. I can probably still allow it but reject paths with spaces..

Mmmm maybe same for long paths (although you resolved that for the more recent ghc versions)?

not completely, GHC and cabal themselves can handle it now, but GCC still can't. We'll make more progress here with 8.10 but 8.12 will probably be the first one that we've patched the majority of the APIs in for GCC and binutils etc.

Supported in ghc 8.10.2 https://chocolatey.org/packages/ghc/8.10.2