ghc not found

[gelisam]

From #228 :

I just installed Stack on my Macbook for the purpose of installing Hawk, and stack install ran to completion.

[...]

Now I get the new error:

$ hawk '[1..3]'
hawk: ghc: readCreateProcessWithExitCode: runInteractiveProcess: exec: does not exist (No such file or directory)

[gelisam]

CC @osfameron

[gelisam]

The error says that the ghc executable, which is used for compiling Haskell code, is not in one of the folders listed in your PATH environment variable. That makes sense, since stack intentionally installs ghc in a private folder which does not affect your global installation of ghc if any. Since I do have a global installation of ghc, I did not encounter that problem; so one easy workaround would be to also install ghc globally, using ghcup for example.

[gelisam]

The above is a workaround, but I still want to fix the underlying bug. The ghc executable is probably used to compile the hawk prelude, while stack's private installation of hint and ghc are used to interpret the command-line expression. That's bad, because those might not be the same version of ghc, in which case the compiled version of the prelude will not be used. That might explain #126, in which I found that compiling the hawk prelude did not lead to the expected speedup?

[osfameron]

Hah, yeah, that makes sense.
So, as a workaround, I created ~/.local/bin/ghc as:

#!/bin/bash
stack ghc -- $*

which at least gets hawk '1' to run, and might help debug the prelude compilation issue...
But obviously that's not a nice solution 😁.

[gelisam]

Closing in favour of #246