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haskellPackages.mkDerivation: add doHaddockInterfaces option

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This adds a new builder option `doHaddockInterfaces` to enable the -haddock flag in GHC,
which results in Haddock comments parsed at compile-time and embedded in
interface files. These are used by the :doc command in GHCi, as well as IDE
tools like ghcide and hls to display docs on hover.

The `-haddock` flag has been around since at least 8.2, even though it does not
get a mention in the GHC Users guide.

There are two downsides to turning on this flag:

1. Increased compile times, since Haddocks must be parsed and then encoded
2. Haddock parse errors now become compile errors for GHC < 9.0.1
   (https://gitlab.haskell.org/ghc/ghc/-/issues/8944)

Thus we only enable the feature if we have GHC 9.0.1 and haddock is
enabled; when 9.0.1 becomes the default GHC, we may need to reevaluate
the performance concern.

Co-authored-by: sternenseemann <sternenseemann@systemli.org>
This commit is contained in:
Pepe Iborra 2020-06-23 14:18:56 +01:00 committed by sternenseemann
parent da2c9c6eab
commit d68033afae
1 changed files with 6 additions and 1 deletions
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7
pkgs/development/haskell-modules/generic-builder.nix
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@ -56,6 +56,7 @@ in
, mainProgram ? null
, doCoverage ? false
, doHaddock ? !(ghc.isHaLVM or false)
, doHaddockInterfaces ? doHaddock && lib.versionAtLeast ghc.version "9.0.1"
, passthru ? {}
, pkg-configDepends ? [], libraryPkgconfigDepends ? [], executablePkgconfigDepends ? [], testPkgconfigDepends ? [], benchmarkPkgconfigDepends ? []
, testDepends ? [], testHaskellDepends ? [], testSystemDepends ? [], testFrameworkDepends ? []
@ -226,7 +227,11 @@ let
] ++ optionals isCross ([
"--configure-option=--host=${stdenv.hostPlatform.config}"
] ++ crossCabalFlags
) ++ optionals enableSeparateBinOutput ["--bindir=${binDir}"];
) ++ optionals enableSeparateBinOutput [
"--bindir=${binDir}"
] ++ optionals (doHaddockInterfaces && isLibrary) [
"--ghc-options=-haddock"
];
setupCompileFlags = [
(optionalString (!coreSetup) "-${nativePackageDbFlag}=$setupPackageConfDir")