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authorVincent Ambo <tazjin@google.com>2019-08-15T15·11+0100
committerVincent Ambo <tazjin@google.com>2019-08-15T15·11+0100
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-<p align="left"><img src="logo/horizontal.png" alt="rules_haskell" height="100px"></p>
-
-# Haskell rules for [Bazel][bazel]
-
-[![CircleCI](https://circleci.com/gh/tweag/rules_haskell.svg?style=svg)](https://circleci.com/gh/tweag/rules_haskell)
-[![Build Status](https://dev.azure.com/tweag/rules_haskell/_apis/build/status/tweag.rules_haskell?branchName=master)](https://dev.azure.com/tweag/rules_haskell/_build/latest?definitionId=1?branchName=master)
-
-Bazel automates building and testing software. It scales to very large
-multi-language projects. This project extends Bazel with build rules
-for Haskell. Get started building your own project using these rules
-wih the [setup script below](#setup).
-
-[bazel]: https://bazel.build/
-[bazel-getting-started]: https://docs.bazel.build/versions/master/getting-started.html
-[bazel-cli]: https://docs.bazel.build/versions/master/command-line-reference.html
-[external-repositories]: https://docs.bazel.build/versions/master/external.html
-[nix]: https://nixos.org/nix
-
-## Rule summary
-
-The full reference documentation for rules is at https://haskell.build.
-
-## Setup
-
-You'll need [Bazel >= 0.24][bazel-getting-started] installed.
-
-### The easy way
-
-In a fresh directory, run:
-
-```console
-$ curl https://haskell.build/start | sh
-```
-
-This will generate initial `WORKSPACE` and `BUILD` files for you. See the
-[examples](./tests) and the [API reference](#Rules) below to adapt these for
-you project. Then,
-
-```console
-$ bazel build //...    # Build all targets
-$ bazel test //...     # Run all tests
-```
-
-You can learn more about Bazel's command line
-syntax [here][bazel-cli]. Common [commands][bazel-cli-commands] are
-`build`, `test`, `run` and `coverage`.
-
-### Nixpkgs
-
-This rule set supports [Nixpkgs][nixpkgs]. If you are on NixOS, or if
-you are using Nixpkgs on your project, consider passing the following
-argument on the command-line to select a Nixpkgs-based toolchain for
-the build:
-
-```
-$ bazel build --host_platform=@io_tweag_rules_haskell//haskell/platforms:linux_x86_64_nixpkgs //...
-```
-
-See [below](#saving-common-command-line-flags-to-a-file) to
-permanently set that flag.
-
-[bazel-cli-commands]: https://docs.bazel.build/versions/master/command-line-reference.html#commands
-[nixpkgs]: https://nixos.org/nixpkgs/
-
-### Doing it manually
-
-Add the following to your `WORKSPACE` file, and select a `$VERSION`
-(or even an arbitrary commit hash) accordingly.
-
-```bzl
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-http_archive(
-  name = "io_tweag_rules_haskell",
-  strip_prefix = "rules_haskell-$VERSION",
-  urls = ["https://github.com/tweag/rules_haskell/archive/v$VERSION.tar.gz"],
-)
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-	"haskell_repositories",
-	"haskell_register_toolchains",
-)
-
-haskell_repositories()
-
-haskell_register_toolchains()
-```
-
-You will then need to write one `BUILD` file for each "package" you
-want to define. See below for examples.
-
-## Tutorial and Examples
-
-We provide a [tutorial for writing your first rules][tutorial].
-The corresponding source code is in [./tutorial](./tutorial).
-
-A collection of example rules is in [./examples](./examples).
-
-[tutorial]: https://rules-haskell.readthedocs.io/en/latest/
-
-## Rules
-
-See https://api.haskell.build for the reference documentation on provided
-rules. Using [./serve-docs.sh](./serve-docs.sh), you can also view
-this documentation locally.
-
-## Language interop
-
-We may be supporting interop with other languages in one way or
-another. Please see languages listed below about how.
-
-### C/C++
-
-C/C++ libraries can be specified as dependencies. Exporting Haskell libraries
-as C/C++ dependencies currently requires the `cc_haskell_import` rule. This is
-a temporary workaround to Bazel limitations.
-
-### Java
-
-You can supply `java_*` rule targets in `deps` of
-[haskell_binary](#haskell_binary) and
-[haskell_library](#haskell_library). This will make jars produced by
-those dependencies available during Haskell source compilation phase
-(i.e. not during linking &c. but it's subject to change) and set the
-CLASSPATH for that phase as well.
-
-## Troubleshooting
-
-### No such file or directory
-
-If you see error messages complaining about missing `as` (`ld` or indeed
-some other executable):
-
-```
-cc: error trying to exec 'as': execvp: No such file or directory
-`cc' failed in phase `Assembler'. (Exit code: 1)
-```
-
-It means that your `gcc` cannot find `as` by itself. This happens only on
-certain operating systems which have `gcc` compiled without `--with-as` and
-`--with-ld` flags. We need to make `as` visible manually in that case:
-
-```bzl
-# Create a symlink to system executable 'as'
-genrule(
-    name = "toolchain_as",
-    outs = ["as"],
-    cmd = "ln -s /usr/bin/as $@",
-)
-
-# Make it visible to rules_haskell rules:
-haskell_toolchain(
-    name = "ghc",
-    tools = ["@ghc//:bin"],
-    version = "8.4.1",
-    extra_binaries = [":toolchain_as"], # <----
-)
-```
-
-### `__STDC_VERSION__` does not advertise C99 or later
-
-If you see an error message like this:
-
-```
-/root/.cache/bazel/_bazel_root/b8b1b1d6144a88c698a010767d2217af/external/ghc/lib/ghc-8.4.1/include/Stg.h:29:3: error:
-     error: #error __STDC_VERSION__ does not advertise C99 or later
-     # error __STDC_VERSION__ does not advertise C99 or later
-       ^
-   |
-29 | # error __STDC_VERSION__ does not advertise C99 or later
-   |   ^
-```
-
-It means that your `gcc` selects incorrect flavor of C by default. We need
-C99 or later, as the error message says, so try this:
-
-```bzl
-haskell_toolchain(
-    name = "ghc",
-    tools = ["@ghc//:bin"],
-    version = "8.4.1",
-    compiler_flags = ["-optc-std=c99"], # <----
-)
-```
-
-### `bazel` fails because some executable cannot be found
-
-Make sure you run your build in a pure nix shell
-(`nix-shell --pure shell.nix`). If it still doesn’t build,
-it is likely a bug.
-
-### A Haskell dependency fails with strange error messages
-
-If you get cabal error messages the likes of:
-
-```
-CallStack (from HasCallStack):
-  dieNoWrap, called at libraries/Cabal/Cabal/Distribution/Utils/LogProgress.hs:61:9 in Cabal-2.0.1.0:Distribution.Utils.LogProgress
-Error:
-    The following packages are broken because other packages they depend on are missing. These broken packages must be rebuilt before they can be used.
-installed package lens-labels-0.2.0.1 is broken due to missing package profunctors-5.2.2-HzcVdviprlKb7Ap1woZu4, tagged-0.8.5-HviTdonkllN1ZD6he1Zn8I
-```
-
-you’ve most likely hit GHC’s
-[infamous non-deterministic library ID bug](https://nixos.org/nixpkgs/manual/#how-to-recover-from-ghcs-infamous-non-deterministic-library-id-bug).
-
-### Warning about home modules during non-sandboxed builds
-
-Say you have a folder that mixes source files for two different
-libraries or for a library and an executable. If you build with
-sandboxing turned off, it is possible that GHC will use the source
-files for one library during the build of the other. The danger in
-this situation is that because GHC used inputs that Bazel didn't know
-about, incremental rebuilds might not be correct. This is why you get
-a warning of the following form if this happens:
-
-```
-<no location info>: warning: [-Wmissing-home-modules]
-    Modules are not listed in command line but needed for compilation: Foo
-```
-
-Turning sandboxing on (this is Bazel's default on Linux and macOS)
-protects against this problem. If sandboxing is not an option, simply
-put the source files for each target in a separate directory (you can
-still use a single `BUILD` file to define all targets).
-
-## For `rules_haskell` developers
-
-### Saving common command-line flags to a file
-
-If you find yourself constantly passing the same flags on the
-command-line for certain commands (such as `--host_platform` or
-`--compiler`), you can augment the [`.bazelrc`](./.bazelrc) file in
-this repository with a `.bazelrc.local` file. This file is ignored by
-Git.
-
-### Reference a local checkout of `rules_haskell`
-
-When you develop on `rules_haskell`, you usually do it in the context
-of a different project that has `rules_haskell` as a `WORKSPACE`
-dependency, like so:
-
-```
-http_archive(
-    name = "io_tweag_rules_haskell",
-    strip_prefix = "rules_haskell-" + version,
-    sha256 = …,
-    urls = …,
-)
-```
-
-To reference a local checkout instead, use the
-[`--override_repository`][override_repository] command line option:
-   
-```
-bazel build/test/run/sync \
-  --override_repository io_tweag_rules_haskell=/path/to/checkout
-```
-   
-If you don’t want to type that every time, [temporarily add it to
-`.bazelrc`][bazelrc].
-
-[override_repository]: https://docs.bazel.build/versions/master/command-line-reference.html#flag--override_repository
-[local_repository]: https://docs.bazel.build/versions/master/be/workspace.html#local_repository
-[bazelrc]: https://docs.bazel.build/versions/master/best-practices.html#bazelrc
-
-### Test Suite
-
-To run the test suite for these rules, you'll need [Nix][nix]
-installed. First, from the project’s folder start a pure nix shell:
-
-```
-$ nix-shell --pure shell.nix
-```
-
-This will make sure that bazel has the exact same environment
-on every development system (`python`, `ghc`, `go`, …).
-
-To build and run tests locally, execute:
-
-```
-$ bazel test //...
-```
-
-Skylark code in this project is formatted according to the output of
-[buildifier]. You can check that the formatting is correct using:
-
-```
-$ bazel run //:buildifier
-```
-
-If tests fail then run the following to fix the formatting:
-
-```
-$ git rebase --exec "bazel run //:buildifier-fix" <first commit>
-```
-
-where `<first commit>` is the first commit in your pull request.
-This fixes formatting for each of your commits separately, to keep
-the history clean.
-
-[buildifier]: https://github.com/bazelbuild/buildtools/tree/master/buildifier
-
-### <a name="nixpkgs-pin" />How to update the nixpkgs pin
-
-You have to find a new git commit where all our `shell.nix`
-dependencies are available from the official NixOS Hydra binary cache.
-
-At least for `x86-linux` this is guaranteed for the `unstable`
-channels. You can find the `nixpkgs` git commit of current `unstable`
-here:
-
-https://nixos.org/channels/nixos-unstable/git-revision
-
-That might be too old for your use-case (because all tests have to
-pass for that channel to be updated), so as a fallback there is:
-
-https://nixos.org/channels/nixos-unstable-small/git-revision
-
-You copy that hash to `url` in
-[`./nixpkgs/default.nix`](./nixpkgs/default.nix). Don’t forget to
-change the `sha256` or it will use the old version. Please update the
-date comment to the date of the `nixpkgs` commit you are pinning to.
-
-### CircleCI
-
-Pull Requests are checked by CircleCI.
-
-If a check fails and you cannot reproduce it locally (e.g. it failed on Darwin
-and you only run Linux), you can [ssh into CircleCI to aid debugging][ci-ssh].
-
-[ci-ssh]: https://circleci.com/docs/2.0/ssh-access-jobs/
-
-#### “unable to start any build”
-
-```
-error: unable to start any build; either increase '--max-jobs' or enable remote builds
-```
-
-We set `--builders ""` and `--max-jobs 0` on CI to be sure all
-dependencies are coming from binary caches. You might need to add an
-exception (TODO: where to add exception) or [switch to a different
-nixpkgs pin](#nixpkgs-pin).