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haskell: tell users to use Stack's nix support when missing system library.

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This commit is contained in:
Mathieu Boespflug 2016-01-17 21:19:14 +01:00
parent 01f384b8b4
commit 6f09628c32
1 changed files with 12 additions and 8 deletions
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20
doc/haskell-users-guide.md
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@ -664,7 +664,7 @@ can configure the environment variables
in their `~/.bashrc` file to avoid the compiler error.
### Using Stack together with Nix
### Builds using Stack complain about missing system libraries
-- While building package zlib-0.5.4.2 using:
runhaskell -package=Cabal-1.22.4.0 -clear-package-db [... lots of flags ...]
@ -692,13 +692,16 @@ means specific to Stack: you'll have that problem with any other
Haskell package that's built inside of nix-shell but run outside of that
environment.
I suppose we could try to remedy the issue by wrapping `stack` or
`cabal` with a script that tries to find those kind of implicit search
paths and makes them explicit on the "cabal configure" command line. I
don't think anyone is working on that subject yet, though, because the
problem doesn't seem so bad in practice.
You can remedy this issue in several ways. The easiest is to add a `nix` section
to the `stack.yaml` like the following:
You can remedy that issue in several ways. First of all, run
nix:
enable: true
packages: [ zlib ]
Stack's Nix support knows to add `${zlib}/lib` and `${zlib}/include` as an
`--extra-lib-dirs` and `extra-include-dirs`, respectively. Alternatively, you
can achieve the same effect by hand. First of all, run
$ nix-build --no-out-link "<nixpkgs>" -A zlib
/nix/store/alsvwzkiw4b7ip38l4nlfjijdvg3fvzn-zlib-1.2.8
@ -722,7 +725,8 @@ to find out the store path of the system's zlib library. Now, you can
Typically, you'll need --extra-include-dirs as well. It's possible
to add those flag to the project's "stack.yaml" or your user's
global "~/.stack/global/stack.yaml" file so that you don't have to
specify them manually every time.
specify them manually every time. But again, you're likely better off using
Stack's Nix support instead.
The same thing applies to `cabal configure`, of course, if you're
building with `cabal-install` instead of Stack.