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Allow older ghc versions in cabalProject (#817)

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Currently the `dummy-ghc-data`, `nix-tools` plan and `cabal-install`
plan must be materialized for the selected `ghc`.  This change
relaxes that restriction and will instead use `nix-tools` and
`cabal-install` built with a fixed `ghc` version (currently `ghc865`)
and will calculate the `dummy-ghc-data` as an IFD.

It will `__trace` a warning of the form:

```
WARNING: No materialized dummy-ghc-data for ghc-8.6.4-x86_64-darwin.
```
This commit is contained in:
Hamish Mackenzie 2020-08-14 19:22:30 +12:00 committed by GitHub
parent 2db0b60816
commit fa25a679bc
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1 changed files with 17 additions and 10 deletions
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27
lib/call-cabal-project-to-nix.nix
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@ -21,8 +21,8 @@ in
, caller ? "callCabalProjectToNix" # Name of the calling funcion for better warning messages
, ghc ? null # Deprecated in favour of `compiler-nix-name`
, ghcOverride ? null # Used when we need to set ghc explicitly during bootstrapping
, nix-tools ? evalPackages.haskell-nix.nix-tools.${compiler-nix-name} # When building cabal projects we use the nix-tools
, cabal-install ? evalPackages.haskell-nix.cabal-install.${compiler-nix-name} # and cabal-install compiled with matching ghc version
, nix-tools ? evalPackages.haskell-nix.nix-tools-unchecked.${compiler-nix-name} # When building cabal projects we use the nix-tools
, cabal-install ? evalPackages.haskell-nix.cabal-install-unchecked.${compiler-nix-name} # and cabal-install compiled with matching ghc version
, configureArgs ? "" # Extra arguments to pass to `cabal v2-configure`.
# `--enable-tests --enable-benchmarks` are included by default.
# If the tests and benchmarks are not needed and they
@ -212,14 +212,21 @@ let
# The solution here is to capture the GHC outputs that `cabal v2-configure`
# requests and materialize it so that the real GHC is only needed
# when `checkMaterialization` is set.
dummy-ghc-data = pkgs.haskell-nix.materialize ({
sha256 = null;
sha256Arg = "sha256";
materialized = ../materialized/dummy-ghc + "/${ghc.targetPrefix}${ghc.name}-${pkgs.stdenv.buildPlatform.system}";
reasonNotSafe = null;
} // pkgs.lib.optionalAttrs (checkMaterialization != null) {
inherit checkMaterialization;
}) (
dummy-ghc-data =
let
materialized = ../materialized/dummy-ghc + "/${ghc.targetPrefix}${ghc.name}-${pkgs.stdenv.buildPlatform.system}";
in pkgs.haskell-nix.materialize ({
sha256 = null;
sha256Arg = "sha256";
materialized = if __pathExists materialized
then materialized
else __trace ("WARNING: No materialized dummy-ghc-data for "
+ "${ghc.targetPrefix}${ghc.name}-${pkgs.stdenv.buildPlatform.system}.")
null;
reasonNotSafe = null;
} // pkgs.lib.optionalAttrs (checkMaterialization != null) {
inherit checkMaterialization;
}) (
runCommand ("dummy-data-" + ghc.name) {
nativeBuildInputs = [ ghc ];
} ''