ghc-mod / stack / dist dir

[alanz]

I use inf-haskell-mode with GHC 7.10.2 and ghc-mod compiled from https://github.com/alanz/ghc-mod/tree/HaRe (basically ghc-mod master but exposing some more internals)

haskell-mode is set up out of the box from spacemacs

I have found that the on the fly checking goes into a continuous cabal configure reload loop as I type unless I make sure that the ./dist directory exists, either by doing cabal configure separately from stack, or by symlinking the output of stack path --dist-dir to ./dist.

[gracjan]

@DanielG, @kazu-yamamoto: pinging so that you know there is a potential issue.

[DanielG]

I'm not familiar with inf-haskell-mode does that even invoke cabal configure somehow?

[alanz]

I think it is the ghc-mod using cabal-helper to read its cache, not finding
a dist-dir and doing a configure, which configures in the
.stack-work directory and so is not seen. And then this just repeats.

On Sun, Aug 9, 2015 at 2:29 PM, Daniel Gröber [email protected]
wrote:

I'm not familiar with inf-haskell-mode does that even invoke cabal
configure somehow?

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#801 (comment)
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[DanielG]

Oh well that makes sense. But ghc-mod shouldn't go into a loop by itself. Something needs to be invoking it over and over.

[alanz]

That is the haskell-mode tie-in. The "loop" is triggered every time the
file is saved, when ghc-mod check is invoked on it.

On Sun, Aug 9, 2015 at 2:40 PM, Daniel Gröber [email protected]
wrote:

Oh well that makes sense. But ghc-mod shouldn't go into a loop by itself.
Something needs to be invoking it over and over.

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#801 (comment)
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[DanielG]

So what happens when you do it on the command line?

[gracjan]

As I understand ghc-mod supports .stack these days, doesn't it?

If there is something to do on haskell-mode then write here and we will reopen this issue.