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146 lines
6.3 KiB
Markdown
146 lines
6.3 KiB
Markdown
# Setup Troubleshooting
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This page serves as a dumping ground for setup problems and their resolutions. We recommend everyone first runs `ghcide` on the console to check what files in their project load, and only the moves on to using `ghcide` through an editor (e.g. VS Code).
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## "mismatched interface file versions"
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If you see a problem such as:
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```console
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File: ./test/Spec.hs
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Range: 1:0-1:0
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Source: typecheck
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Severity: DsError
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Message:
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test/Spec.hs:1:1: error:
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Bad interface file:
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/Users/daml/.stack/programs/x86_64-osx/ghc-8.6.4/lib/ghc-8.6.4/base-4.12.0.0/Prelude.hi
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mismatched interface file versions (wanted "8065", got "8064")
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```
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The cause is that your program is configured to use a different GHC to the one you built `ghcide` with. In `ghcide` you can view the version number it was compiled with on the first line as:
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```console
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ghcide version: 0.0.3 (GHC: 8.6.5)
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```
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You can see the version of GHC being used by this project in the second-last line of the output with `ghc-8.6.4/`, or in in mismatch interfaces of wanted `8065` (aka 8.6.5), got `8064` (aka 8.6.4). The solution is to use the same GHC version in both places.
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## “failed to load interface for ‘…’ There are files missing”
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If you see a problem such as:
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```console
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File: ./src/File/FileStream.hs
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Range: 1:0-100001:0
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Source: typecheck
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Severity: DsError
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Message:
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Program error: Failed to load interface for ‘Data.DList’
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Files that failed:
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There are files missing in the ‘dlist-0.8.0.7’ package,
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* ./src/File/FileStream.hs
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try running 'ghc-pkg check'.
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Use -v to see a list of the files searched for.
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```
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It might be caused by `ghcide` picking up the wrong cradle. In
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particular, this has been observed when running in a `nix-shell` where
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`ghcide` picked up the default cradle. Try setting the cradle
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explicitly, e.g., to use the cabal cradle create a `hie.yaml` file
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with the following content:
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```
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cradle: {cabal: {component: "mylibrary"}}
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```
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If you are using stack, find the list of names you can use:
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$ stack ide targets
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mypackage:lib
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mypackage:exe:mypackage-exe
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mypackage:test:mypackage-test
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and create a `hie.yaml` file as follows:
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{stack: {component: "mypackage:lib"}}
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## ghc: readCreateProcess: does not exist
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On Linux: try `stack exec ghcide`` instead of `ghcide` directly.
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I was getting this in Windows: `ghcide.exe: ghc: readCreateProcess: does not exist (No such file or directory)`
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And we figured a hack around for this:
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VSCode user or workspace settings, add these:
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"hic.executablePath": "stack",
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"hic.arguments": "exec ghcide -- --lsp"
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Since I use stack. Required if you don't have a `ghc` on your path.
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## Could not find module ...
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Try adding an explicit `hie.yaml` file and see if that helps.
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## Ambiguous main module
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```console
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$ stack exec ghcide
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...
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ghcide: CradleError (ExitFailure 1) ["Failed to parse result of calling stack","","* * * * * * * *","The main module to load is ambiguous. Candidates are: ","1. Package `mypackage' component mypackage:exe:mypackage-exe with main-is file: /home/user/mypackage/app/Main.hs","2. Package `mypackage' component mypackage:exe:otherbin-exe with main-is file: /home/user/mypackage/app/otherbin.hs","You can specify which one to pick by: "," * Specifying targets to stack ghci e.g. stack ghci mypackage:exe:mypackage-exe"," * Specifying what the main is e.g. stack ghci --main-is mypackage:exe:mypackage-exe"," * Choosing from the candidate above [1..2]","* * * * * * * *","","<stdin>: hGetLine: end of file"]
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```
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Add a `hie.yaml` file to specify the module, e.g.
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cradle: {stack: {component: "mypackage:exe:mypackage-exe"}}
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## Works in `ghcide` but not my editor
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Does `ghcide` alone work on the console? Did you first enter a Nix shell? Or run `stack exec ghcide`? If so, there are two options:
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1. Run your editor via the same mechanism, e.g. `stack exec code`.
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2. Change the extension to use the executable as `stack` and the arguments as `exec -- ghcide --lsp`.
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## Issues with Nix
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If you are using packages installed by Nix, then often Nix will set `NIX_GHC_LIBDIR` to say where the libraries are installed. `ghcide` can cope with that. However, sometimes the `ghc` on your shell will actually be a shell script that sets `NIX_GHC_LIBDIR`, which `ghcide` can't find. If that happens, you need to either set `NIX_GHC_LIBDIR` (so `ghcide` can see it) or use a proper [Nix compatible wrapper](https://github.com/hercules-ci/ghcide-nix) over `ghcide`.
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## ghcide: this operation requires -fexternal-interpreter
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This can happen if you have a GHC compiled without GHC library support. This seems to be [the case](https://github.com/input-output-hk/haskell.nix/issues/313) with `haskell.nix` at the moment.
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## Symbol’s value as variable is void: capability
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As described [here](https://github.com/emacs-lsp/lsp-mode/issues/770#issuecomment-483540119) and [here](https://github.com/emacs-lsp/lsp-mode/issues/517#issuecomment-445448700), the default installation of `lsp-mode`, `lsp-ui`, `lsp-ui-mode` and `lsp-haskell` as described in [ghcide's "Using with Emacs" section](https://github.com/digital-asset/ghcide/#using-with-emacs) may result in the following error message:
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```
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Symbol’s value as variable is void: capability
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```
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This can be caused by either an old version of the Emacs package `dash`, or a cached `.elc` file for an old version. A fix consists of (re)moving the old package from ~/.emacs.d/elpa/ and installing it again, e.g. via M-x `package-list-packages` RET and M-x `package-install` RET `dash` RET. If this is not enough,
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```
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find ~/.emacs.d -name '*.elc' -exec rm {} \;
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```
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(which causes recompilation of all bytecode-compiled scripts.)
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## Docker stack builds
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You're likely to see `ghcide: (ExitFailure 1,"","")`. Because ghcide can't get at the ghc installed inside Docker, your best bet is to `stack exec ghcide` and make sure `ghcide` is installed within the container. Full details at [issue 221](https://github.com/digital-asset/ghcide/issues/221).
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## stty error on Windows + Stack
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If you get an error like:
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```
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ghcide.exe: CradleError (ExitFailure 1) ["Failed to parse result of calling stack","'stty' is not recognized as an internal or external command,","operable program or batch file."
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```
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Then the workaround from https://github.com/haskell/haskell-ide-engine/issues/1428#issuecomment-547530794 might help.
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