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72 lines
2.7 KiB
Nix
72 lines
2.7 KiB
Nix
# Hadrian is the build system used to (exclusively) build GHC. It can
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# (theoretically) be used starting with GHC 9.4 and is required since 9.6. It is
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# developed in the GHC source tree and specific to the GHC version it is released
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# with, i.e. Hadrian always needs to be built from the same GHC source tree as
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# the GHC we want to build.
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#
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# This fact makes it impossible to integrate Hadrian into our Haskell package
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# sets which are also used to bootstrap GHC, since a package set can bootstrap
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# multiple GHC versions (usually two major versions). A bootstrap set would need
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# knowledge of the GHC it would eventually bootstrap which would make the logic
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# unnecessarily complicated.
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#
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# Luckily Hadrian is, while annoying to bootstrap, relatively simple. Specifically
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# all it requires to build is (relative to the GHC we are trying to build) a
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# build->build GHC and build->build Haskell packages. We can get all of this
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# from bootPkgs which is already passed to the GHC expression.
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#
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# The solution is the following: The GHC expression passes its source tree and
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# version along with some parameters to this function (./make-hadrian.nix)
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# which acts as a common expression builder for all Hadrian version as well as
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# related packages that are managed in the GHC source tree. Its main job is to
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# expose all possible compile time customization in a common interface and
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# take care of all differences between Hadrian versions.
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{
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bootPkgs,
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lib,
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}:
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{
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# GHC source tree and version to build hadrian & friends from.
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# These are passed on to the actual package expressions.
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ghcSrc,
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ghcVersion,
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# Contents of a non-default UserSettings.hs to use when building hadrian, if any.
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# Should be a string or null.
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userSettings ? null,
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}:
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let
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callPackage' =
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f: args:
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bootPkgs.callPackage f (
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{
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inherit ghcSrc ghcVersion;
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}
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// args
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);
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ghc-platform = callPackage' ./ghc-platform.nix { };
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ghc-toolchain = callPackage' ./ghc-toolchain.nix {
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inherit ghc-platform;
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};
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in
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callPackage' ./hadrian.nix (
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{
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inherit userSettings;
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# Taking `ghc` as an input may be too confusing
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bootGhcVersion = bootPkgs.ghc.version;
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}
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// lib.optionalAttrs (lib.versionAtLeast ghcVersion "9.9") {
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# Starting with GHC 9.9 development, additional in tree packages are required
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# to build hadrian. (Hackage-released conditional dependencies are handled
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# in ./hadrian.nix without requiring intervention here.)
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inherit ghc-platform ghc-toolchain;
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}
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// lib.optionalAttrs (lib.versionAtLeast ghcVersion "9.11") {
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# See https://gitlab.haskell.org/ghc/ghc/-/commit/145a6477854d4003a07573d5e7ffa0c9a64ae29c
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Cabal = bootPkgs.Cabal_3_14_2_0;
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}
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)
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