README.md

rule_haskell examples

Examples of using rules_haskell, the Bazel rule set for building Haskell code.

vector: shows how to build the vector package that is found on Hackage (as well as transitive dependencies primitive and transformers) without using Cabal.
cat_hs: is an example of a non-trivial application with multiple third-party dependencies downloaded from Hackage, C library dependencies and split up into multiple libraries and a binary. We use a rule wrapping Cabal to build the Hackage dependencies.
rts: demonstrates foreign exports and shows how to link against GHC's RTS library, i.e. libHSrts.so.

Build everything in the root workspace with:

$ bazel build //...

Show every target of the vector example:

$ bazel query //vector/...
//vector:vector
//vector:semigroups
//vector:primitive
//vector:ghc-prim
//vector:deepseq
//vector:base

Build the three main Haskell targets:

$ bazel build //cat_hs/exec/cat_hs
$ bazel build //vector
$ bazel build //rts:add-one-hs