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diff --git a/third_party/bazel/rules_haskell/examples/README.md b/third_party/bazel/rules_haskell/examples/README.md new file mode 100644 index 0000000000..7b477f5476 --- /dev/null +++ b/third_party/bazel/rules_haskell/examples/README.md @@ -0,0 +1,45 @@ +# rule_haskell examples + +Examples of using [rules_haskell][rules_haskell], the Bazel rule set +for building Haskell code. + +* [**vector:**](./vector/) shows how to build the `vector` package as + found on Hackage, using a Nix provided compiler toolchain. +* [**rts:**](./rts/) demonstrates foreign exports and shows how to + link against GHC's RTS library, i.e. `libHSrts.so`. + +## **Important** + +Run all commands from the root of `rules_haskell`. +If you `cd examples/`, bazel *will* [break on +you](https://github.com/tweag/rules_haskell/issues/740). +This is a current problem with bazel workspaces. + +## Root Workspace + +Build everything in the root workspace with; + +``` +$ bazel build @io_tweag_rules_haskell_examples//... +``` + +Show every target of the vector example; + +``` +$ bazel query @io_tweag_rules_haskell_examples//vector/... +@io_tweag_rules_haskell_examples//vector:vector +@io_tweag_rules_haskell_examples//vector:semigroups +@io_tweag_rules_haskell_examples//vector:primitive +@io_tweag_rules_haskell_examples//vector:ghc-prim +@io_tweag_rules_haskell_examples//vector:deepseq +@io_tweag_rules_haskell_examples//vector:base +``` + +Build the two main Haskell targets; + +``` +$ bazel build @io_tweag_rules_haskell_examples//vector +$ bazel build @io_tweag_rules_haskell_examples//rts:add-one-hs +``` + +[rules_haskell]: https://github.com/tweag/rules_haskell |