This adds a way to specify the `evalSystem` or `evalPackages` explicitly when calling the `project` functions.
Currently if we want to make a `flake` that supports multiple systems we have few options:
* Require builders for all the supported systems (even just for `nix flake show`).
* Pass `--impure` so that haskell.nix can see `builtins.currentSystem` to set up `pkgs.evalPackages` to use that. Unfortunately this prevents nix from caching some of the work it does and often results in it recalculating for each supported system when it would otherwise be cached and take no time at all.
* Add an overlay to replace `evalPackages`. This works, but it is not straight forward.
* Materialize the nix files for the project.
This change allows `evalSystem = "x86_64-linux";` to be passed telling `haskell.nix` to run `cabal` and `nix-tools` on that system. The user will have to have a builder for that system, but does not need to have builders for the others (unless building outputs for them).
Fixes:
Warning: `stdenv.lib` is deprecated and will be removed in the next release. Please use `pkgs.lib` instead. For more information see https://github.com/NixOS/nixpkgs/issues/108938
Fixes ghcjs 8.6.5 and 8.8.4.
Uses emscripten for ghcjs 8.8 and adds scripts for building ghcjs 8.8.
Many fixes for ghcjs test failures.
Includes relocatableConfigFiles for making relocatable ghcjs bundles.
* Include `tests` in path for cross compiled tests
* Add ghc-boot-packages-nix to haskellNixRoots
* Fix naming warnings in tests sources
* Uses a single cleanGit call for all the tests
* Add memoize code for ghc-boot and ghc-extra pkgs
* Memoize ghc-boot and ghc-extra pkgs nix
* Fix release.nix being more strict than ci.nix by updating filterAttrsOnlyRecursive in ci-lib.nix
* Nicer errors when materialized path does not exist
* Updated materialization docs
* Add internalHackageIndexState to set the index-state used within haskell.nix
* Enables tests for Musl and AArch64 (also rasbery pi, but leaves them disabled for now) and includes many fixes for the tests that were broken.
* Makes Musl cross compiler more like native (including making `ghci` and `runghc` work)
* Updates selection of enableShared
* Works around missing configFiles attribute issue
* Use ghc-extra-packages and compiler.nix-name to pick the right extra packages
* Leaves out --cross-compile on hsc2hs for musl
* Fixes haddock and hoogle for musl and disables them for other cross compilers
* Adds ghc 8.8.3
* Static link components (except libraries and `all`) on musl
* Use qemu for the arm cross compile `testWrapper`
* Add isCrossHost and isCrossTarget functions
* Fixes profiling on AArch64
* Disable split sections when compiling for windows (fixes GHC 8.8 cross compile to windows)
* Disable hoogle in cross compiler shells for now
Changes to the haskell.nix code to fix broken tests:
* Add missing `then` to `call-cabal-project-to-nix.nix`.
* Fix default `hsSourceDirs` so that `.` gets included for `.all` component if one of the components does not have a `hsSourceDir` set.
* Fix `haskellNixRoots` so it works when cross compiling to windows.
Improvements to the haskell.nix tests:
* Run haskell.nix tests of nixpkgs 19.03 and 19.09.
* Run haskell.nix tests cross compiled to Windows under Wine (when possible).
* Add nix used as IFD inputs as tests to ensure they are cached.
* Use `haskell-nix.cabal-install` instead of `nixpkgs.cabal-install` in tests.
* Add a snapshots attribute
These contain package sets for all of the Stackage snapshots.
Relates to #22
* tests: Add stackage snapshots test
* Add a stackage fix for "No attribute: hsc2hs"
* Add comment to snapshots.nix and fix version comparison function
