mirror of
https://github.com/NixOS/nixpkgs.git
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653 lines
26 KiB
Nix
653 lines
26 KiB
Nix
# This expression takes a file like `hackage-packages.nix` and constructs
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# a full package set out of that.
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{ # package-set used for build tools (all of nixpkgs)
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buildPackages
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, # A haskell package set for Setup.hs, compiler plugins, and similar
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# build-time uses.
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buildHaskellPackages
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, # package-set used for non-haskell dependencies (all of nixpkgs)
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pkgs
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, # stdenv provides our build and host platforms
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stdenv
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, # this module provides the list of known licenses and maintainers
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lib
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# needed for overrideCabal & packageSourceOverrides
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, haskellLib
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, # hashes for downloading Hackage packages
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# This is either a directory or a .tar.gz containing the cabal files and
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# hashes of Hackage as exemplified by this repository:
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# https://github.com/commercialhaskell/all-cabal-hashes/tree/hackage
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all-cabal-hashes
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, # compiler to use
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ghc
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, # A function that takes `{ pkgs, lib, callPackage }` as the first arg and
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# `self` as second, and returns a set of haskell packages
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package-set
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, # The final, fully overridden package set usable with the nixpkgs fixpoint
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# overriding functionality
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extensible-self
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}:
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# return value: a function from self to the package set
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self:
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let
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inherit (stdenv) buildPlatform hostPlatform;
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inherit (lib) fix' extends makeOverridable;
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inherit (haskellLib) overrideCabal;
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mkDerivationImpl = pkgs.callPackage ./generic-builder.nix {
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inherit stdenv;
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nodejs = buildPackages.nodejs-slim;
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inherit (self) buildHaskellPackages ghc ghcWithHoogle ghcWithPackages;
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inherit (self.buildHaskellPackages) jailbreak-cabal;
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hscolour = overrideCabal (drv: {
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isLibrary = false;
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doHaddock = false;
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hyperlinkSource = false; # Avoid depending on hscolour for this build.
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postFixup = "rm -rf $out/lib $out/share $out/nix-support";
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}) self.buildHaskellPackages.hscolour;
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cpphs = overrideCabal (drv: {
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isLibrary = false;
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postFixup = "rm -rf $out/lib $out/share $out/nix-support";
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}) (self.cpphs.overrideScope (self: super: {
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mkDerivation = drv: super.mkDerivation (drv // {
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enableSharedExecutables = false;
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enableSharedLibraries = false;
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doHaddock = false;
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useCpphs = false;
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});
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}));
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};
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mkDerivation = makeOverridable mkDerivationImpl;
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# manualArgs are the arguments that were explicitly passed to `callPackage`, like:
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#
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# callPackage foo { bar = null; };
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#
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# here `bar` is a manual argument.
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callPackageWithScope = scope: fn: manualArgs:
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let
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# this code is copied from callPackage in lib/customisation.nix
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#
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# we cannot use `callPackage` here because we want to call `makeOverridable`
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# on `drvScope` (we cannot add `overrideScope` after calling `callPackage` because then it is
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# lost on `.override`) but determine the auto-args based on `drv` (the problem here
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# is that nix has no way to "passthrough" args while preserving the reflection
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# info that callPackage uses to determine the arguments).
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drv = if lib.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (lib.functionArgs drv) scope;
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# Converts a returned function to a functor attribute set if necessary
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ensureAttrs = v: if builtins.isFunction v then { __functor = _: v; } else v;
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# this wraps the `drv` function to add `scope` and `overrideScope` to the result.
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drvScope = allArgs: ensureAttrs (drv allArgs) // {
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inherit scope;
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overrideScope = f:
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let newScope = mkScope (fix' (extends f scope.__unfix__));
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# note that we have to be careful here: `allArgs` includes the auto-arguments that
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# weren't manually specified. If we would just pass `allArgs` to the recursive call here,
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# then we wouldn't look up any packages in the scope in the next interation, because it
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# appears as if all arguments were already manually passed, so the scope change would do
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# nothing.
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in callPackageWithScope newScope drv manualArgs;
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};
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in lib.makeOverridable drvScope (auto // manualArgs);
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mkScope = scope: let
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ps = pkgs.__splicedPackages;
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scopeSpliced = pkgs.splicePackages {
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pkgsBuildBuild = scope.buildHaskellPackages.buildHaskellPackages;
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pkgsBuildHost = scope.buildHaskellPackages;
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pkgsBuildTarget = {};
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pkgsHostHost = {};
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pkgsHostTarget = scope;
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pkgsTargetTarget = {};
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} // {
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# Don't splice these
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inherit (scope) ghc buildHaskellPackages;
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};
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in ps // ps.xorg // ps.gnome2 // { inherit stdenv; } // scopeSpliced;
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defaultScope = mkScope self;
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callPackage = drv: args: callPackageWithScope defaultScope drv args;
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# Use cabal2nix to create a default.nix for the package sources found at 'src'.
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haskellSrc2nix = { name, src, sha256 ? null, extraCabal2nixOptions ? "" }:
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let
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sha256Arg = if sha256 == null then "--sha256=" else ''--sha256="${sha256}"'';
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in buildPackages.runCommand "cabal2nix-${name}" {
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nativeBuildInputs = [ buildPackages.cabal2nix-unwrapped ];
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preferLocalBuild = true;
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allowSubstitutes = false;
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LANG = "en_US.UTF-8";
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LOCALE_ARCHIVE = pkgs.lib.optionalString (buildPlatform.libc == "glibc") "${buildPackages.glibcLocales}/lib/locale/locale-archive";
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} ''
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export HOME="$TMP"
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mkdir -p "$out"
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cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.config} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
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'';
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# Given a package name and version, e.g. name = "async", version = "2.2.4",
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# gives its cabal file and hashes (JSON file) as discovered from the
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# all-cabal-hashes value. If that's a directory, it will copy the relevant
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# files to $out; if it's a tarball, it will extract and move them to $out.
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all-cabal-hashes-component = name: version: buildPackages.runCommand "all-cabal-hashes-component-${name}-${version}" {} ''
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mkdir -p $out
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if [ -d ${all-cabal-hashes} ]
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then
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cp ${all-cabal-hashes}/${name}/${version}/${name}.json $out
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cp ${all-cabal-hashes}/${name}/${version}/${name}.cabal $out
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else
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tar --wildcards -xzvf ${all-cabal-hashes} \*/${name}/${version}/${name}.{json,cabal}
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mv */${name}/${version}/${name}.{json,cabal} $out
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fi
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'';
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hackage2nix = name: version: let component = all-cabal-hashes-component name version; in self.haskellSrc2nix {
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name = "${name}-${version}";
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sha256 = ''$(sed -e 's/.*"SHA256":"//' -e 's/".*$//' "${component}/${name}.json")'';
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src = "${component}/${name}.cabal";
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};
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# Adds a nix file derived from cabal2nix in the passthru of the derivation it
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# produces. This is useful to debug callHackage / callCabal2nix by looking at
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# the content of the nix file pointed by `cabal2nixDeriver`.
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# However, it does not keep a reference to that file, which may be garbage
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# collected, which may be an annoyance.
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callPackageKeepDeriver = src: args:
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overrideCabal (orig: {
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passthru = orig.passthru or {} // {
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# When using callCabal2nix or callHackage, it is often useful
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# to debug a failure by inspecting the Nix expression
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# generated by cabal2nix. This can be accessed via this
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# cabal2nixDeriver field.
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cabal2nixDeriver = src;
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};
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}) (self.callPackage src args);
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in package-set { inherit pkgs lib callPackage; } self // {
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inherit mkDerivation callPackage haskellSrc2nix hackage2nix buildHaskellPackages;
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inherit (haskellLib) packageSourceOverrides;
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# callHackage :: Text -> Text -> AttrSet -> HaskellPackage
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#
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# e.g., while overriding a package set:
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# '... foo = self.callHackage "foo" "1.5.3" {}; ...'
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callHackage = name: version: callPackageKeepDeriver (self.hackage2nix name version);
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# callHackageDirect
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# :: { pkg :: Text, ver :: Text, sha256 :: Text }
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# -> AttrSet
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# -> HaskellPackage
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#
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# This function does not depend on all-cabal-hashes and therefore will work
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# for any version that has been released on hackage as opposed to only
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# versions released before whatever version of all-cabal-hashes you happen
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# to be currently using.
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callHackageDirect = {pkg, ver, sha256, rev ? { revision = null; sha256 = null; }}: args:
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let pkgver = "${pkg}-${ver}";
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firstRevision = self.callCabal2nix pkg (pkgs.fetchzip {
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url = "mirror://hackage/${pkgver}/${pkgver}.tar.gz";
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inherit sha256;
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}) args;
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in overrideCabal (orig: {
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revision = rev.revision;
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editedCabalFile = rev.sha256;
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}) firstRevision;
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# Creates a Haskell package from a source package by calling cabal2nix on the source.
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callCabal2nixWithOptions = name: src: opts: args:
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let
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extraCabal2nixOptions = if builtins.isString opts
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then opts
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else opts.extraCabal2nixOptions or "";
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srcModifier = opts.srcModifier or null;
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defaultFilter = path: type:
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pkgs.lib.hasSuffix ".cabal" path ||
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baseNameOf path == "package.yaml";
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expr = self.haskellSrc2nix {
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inherit name extraCabal2nixOptions;
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src = if srcModifier != null
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then srcModifier src
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else if pkgs.lib.canCleanSource src
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then pkgs.lib.cleanSourceWith { inherit src; filter = defaultFilter; }
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else src;
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};
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in overrideCabal (orig: {
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inherit src;
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}) (callPackageKeepDeriver expr args);
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callCabal2nix = name: src: args: self.callCabal2nixWithOptions name src "" args;
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# : { root : Path
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# , name : Defaulted String
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# , source-overrides : Defaulted (Either Path VersionNumber)
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# , overrides : Defaulted (HaskellPackageOverrideSet)
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# , modifier : Defaulted
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# , returnShellEnv : Defaulted
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# , withHoogle : Defaulted
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# , cabal2nixOptions : Defaulted
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# } -> NixShellAwareDerivation
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#
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# Given a path to a haskell package directory, an optional package name
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# which defaults to the base name of the path, an optional set of source
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# overrides as appropriate for the 'packageSourceOverrides' function, an
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# optional set of arbitrary overrides, and an optional haskell package
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# modifier, return a derivation appropriate for nix-build or nix-shell to
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# build that package.
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#
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# If 'returnShellEnv' is true this returns a derivation which will give you
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# an environment suitable for developing the listed packages with an
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# incremental tool like cabal-install.
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#
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# If 'withHoogle' is true (the default if a shell environment is requested)
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# then 'ghcWithHoogle' is used to generate the derivation (instead of
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# 'ghcWithPackages'), see the documentation there for more information.
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#
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# 'cabal2nixOptions' can contain extra command line arguments to pass to
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# 'cabal2nix' when generating the package derivation, for example setting
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# a cabal flag with '--flag=myflag'.
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developPackage =
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{ root
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, name ? lib.optionalString (builtins.typeOf root == "path") (builtins.baseNameOf root)
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, source-overrides ? {}
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, overrides ? self: super: {}
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, modifier ? drv: drv
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, returnShellEnv ? pkgs.lib.inNixShell
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, withHoogle ? returnShellEnv
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, cabal2nixOptions ? "" }:
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let drv =
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(extensible-self.extend
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(pkgs.lib.composeExtensions
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(self.packageSourceOverrides source-overrides)
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overrides))
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.callCabal2nixWithOptions name root cabal2nixOptions {};
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in if returnShellEnv
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then (modifier drv).envFunc {inherit withHoogle;}
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else modifier drv;
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# This can be used to easily create a derivation containing GHC and the specified set of Haskell packages.
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#
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# Example:
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# $ nix-shell -p 'haskellPackages.ghcWithPackages (hpkgs: [ hpkgs.mtl hpkgs.lens ])'
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# $ ghci # in the nix-shell
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# Prelude > import Control.Lens
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#
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# GHC is setup with a package database with all the specified Haskell packages.
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#
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# ghcWithPackages :: (HaskellPkgSet -> [ HaskellPkg ]) -> Derivation
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ghcWithPackages = buildHaskellPackages.callPackage ./with-packages-wrapper.nix {
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haskellPackages = self;
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inherit (self) hoogleWithPackages;
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};
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# Put 'hoogle' into the derivation's PATH with a database containing all
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# the package's dependencies; run 'hoogle server --local' in a shell to
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# host a search engine for the dependencies.
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#
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# Example usage:
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# $ nix-shell -p 'haskellPackages.hoogleWithPackages (p: [ p.mtl p.lens ])'
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# [nix-shell] $ hoogle server
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#
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# hoogleWithPackages :: (HaskellPkgSet -> [ HaskellPkg ]) -> Derivation
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#
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# To reload the Hoogle server automatically on .cabal file changes try
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# this:
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# echo *.cabal | entr -r -- nix-shell --run 'hoogle server --local'
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hoogleWithPackages = self.callPackage ./hoogle.nix {
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haskellPackages = self;
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};
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hoogleLocal =
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{ packages ? [] }:
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lib.warn "hoogleLocal is deprecated, use hoogleWithPackages instead" (
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self.hoogleWithPackages (_: packages)
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);
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# This is like a combination of ghcWithPackages and hoogleWithPackages.
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# It provides a derivation containing both GHC and Hoogle with an index of
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# the given Haskell package database.
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#
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# Example:
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# $ nix-shell -p 'haskellPackages.ghcWithHoogle (hpkgs: [ hpkgs.conduit hpkgs.lens ])'
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#
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# ghcWithHoogle :: (HaskellPkgSet -> [ HaskellPkg ]) -> Derivation
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ghcWithHoogle = self.ghcWithPackages.override {
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withHoogle = true;
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};
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# Returns a derivation whose environment contains a GHC with only
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# the dependencies of packages listed in `packages`, not the
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# packages themselves. Using nix-shell on this derivation will
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# give you an environment suitable for developing the listed
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# packages with an incremental tool like cabal-install.
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#
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# In addition to the "packages" arg and "withHoogle" arg, anything that
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# can be passed into stdenv.mkDerivation can be included in the input attrset
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#
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# # default.nix
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# with import <nixpkgs> {};
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# haskellPackages.extend (haskell.lib.compose.packageSourceOverrides {
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# frontend = ./frontend;
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# backend = ./backend;
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# common = ./common;
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# })
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#
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# # shell.nix
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# let pkgs = import <nixpkgs> {} in
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# (import ./.).shellFor {
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# packages = p: [p.frontend p.backend p.common];
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# withHoogle = true;
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# buildInputs = [ pkgs.python pkgs.cabal-install ];
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# }
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#
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# -- cabal.project
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# packages:
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# frontend/
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# backend/
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# common/
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#
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# bash$ nix-shell --run "cabal new-build all"
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# bash$ nix-shell --run "python"
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shellFor =
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{ # Packages to create this development shell for. These are usually
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# your local packages.
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packages
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, # Whether or not to generate a Hoogle database for all the
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# dependencies.
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withHoogle ? false
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, # Whether or not to include benchmark dependencies of your local
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# packages. You should set this to true if you have benchmarks defined
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# in your local packages that you want to be able to run with cabal benchmark
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doBenchmark ? false
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# An optional function that can modify the generic builder arguments
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# for the fake package that shellFor uses to construct its environment.
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#
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# Example:
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# let
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# # elided...
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# haskellPkgs = pkgs.haskell.packages.ghc884.override (hpArgs: {
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# overrides = pkgs.lib.composeExtensions (hpArgs.overrides or (_: _: { })) (
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# _hfinal: hprev: {
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# mkDerivation = args: hprev.mkDerivation ({
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# doCheck = false;
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# doBenchmark = false;
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# doHoogle = true;
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# doHaddock = true;
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# enableLibraryProfiling = false;
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# enableExecutableProfiling = false;
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# } // args);
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# }
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# );
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# });
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# in
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# haskellPkgs.shellFor {
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# packages = p: [ p.foo ];
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# genericBuilderArgsModifier = args: args // { doCheck = true; doBenchmark = true };
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# }
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#
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# This will disable tests and benchmarks for everything in "haskellPkgs"
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# (which will invalidate the binary cache), and then re-enable them
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# for the "shellFor" environment (ensuring that any test/benchmark
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# dependencies for "foo" will be available within the nix-shell).
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, genericBuilderArgsModifier ? (args: args)
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# Extra dependencies, in the form of cabal2nix build attributes.
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#
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# An example use case is when you have Haskell scripts that use
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# libraries that don't occur in your packages' dependencies.
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#
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# Example:
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#
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# extraDependencies = p: {
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# libraryHaskellDepends = [ p.releaser ];
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# };
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, extraDependencies ? p: {}
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, ...
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} @ args:
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let
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# A list of the packages we want to build a development shell for.
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# This is a list of Haskell package derivations.
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selected = packages self;
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# This is a list of attribute sets, where each attribute set
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# corresponds to the build inputs of one of the packages input to shellFor.
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#
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# Each attribute has keys like buildDepends, executableHaskellDepends,
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# testPkgconfigDepends, etc. The values for the keys of the attribute
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# set are lists of dependencies.
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#
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# Example:
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# cabalDepsForSelected
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# => [
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# # This may be the attribute set corresponding to the `backend`
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# # package in the example above.
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# { buildDepends = [ gcc ... ];
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# libraryHaskellDepends = [ lens conduit ... ];
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# ...
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# }
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# # This may be the attribute set corresponding to the `common`
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# # package in the example above.
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# { testHaskellDepends = [ tasty hspec ... ];
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# libraryHaskellDepends = [ lens aeson ];
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# benchmarkHaskellDepends = [ criterion ... ];
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# ...
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# }
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# ...
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# ]
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cabalDepsForSelected = map (p: p.getCabalDeps) selected;
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# A predicate that takes a derivation as input, and tests whether it is
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# the same as any of the `selected` packages.
|
|
#
|
|
# Returns true if the input derivation is not in the list of `selected`
|
|
# packages.
|
|
#
|
|
# isNotSelected :: Derivation -> Bool
|
|
#
|
|
# Example:
|
|
#
|
|
# isNotSelected common [ frontend backend common ]
|
|
# => false
|
|
#
|
|
# isNotSelected lens [ frontend backend common ]
|
|
# => true
|
|
isNotSelected = input: pkgs.lib.all (p: input.outPath or null != p.outPath) selected;
|
|
|
|
# A function that takes a list of list of derivations, filters out all
|
|
# the `selected` packages from each list, and concats the results.
|
|
#
|
|
# zipperCombinedPkgs :: [[Derivation]] -> [Derivation]
|
|
#
|
|
# Example:
|
|
# zipperCombinedPkgs [ [ lens conduit ] [ aeson frontend ] ]
|
|
# => [ lens conduit aeson ]
|
|
#
|
|
# Note: The reason this isn't just the function `pkgs.lib.concat` is
|
|
# that we need to be careful to remove dependencies that are in the
|
|
# `selected` packages.
|
|
#
|
|
# For instance, in the above example, if `common` is a dependency of
|
|
# `backend`, then zipperCombinedPkgs needs to be careful to filter out
|
|
# `common`, because cabal will end up ignoring that built version,
|
|
# assuming new-style commands.
|
|
zipperCombinedPkgs = vals:
|
|
pkgs.lib.concatMap
|
|
(drvList: pkgs.lib.filter isNotSelected drvList)
|
|
vals;
|
|
|
|
# Zip `cabalDepsForSelected` into a single attribute list, combining
|
|
# the derivations in all the individual attributes.
|
|
#
|
|
# Example:
|
|
# packageInputs
|
|
# => # Assuming the value of cabalDepsForSelected is the same as
|
|
# # the example in cabalDepsForSelected:
|
|
# { buildDepends = [ gcc ... ];
|
|
# libraryHaskellDepends = [ lens conduit aeson ... ];
|
|
# testHaskellDepends = [ tasty hspec ... ];
|
|
# benchmarkHaskellDepends = [ criterion ... ];
|
|
# ...
|
|
# }
|
|
#
|
|
# See the Note in `zipperCombinedPkgs` for what gets filtered out from
|
|
# each of these dependency lists.
|
|
packageInputs =
|
|
pkgs.lib.zipAttrsWith (_name: zipperCombinedPkgs) (cabalDepsForSelected ++ [ (extraDependencies self) ]);
|
|
|
|
# A attribute set to pass to `haskellPackages.mkDerivation`.
|
|
#
|
|
# The important thing to note here is that all the fields from
|
|
# packageInputs are set correctly.
|
|
genericBuilderArgs = {
|
|
pname =
|
|
if pkgs.lib.length selected == 1
|
|
then (pkgs.lib.head selected).name
|
|
else "packages";
|
|
version = "0";
|
|
license = null;
|
|
}
|
|
// packageInputs
|
|
// pkgs.lib.optionalAttrs doBenchmark {
|
|
# `doBenchmark` needs to explicitly be set here because haskellPackages.mkDerivation defaults it to `false`. If the user wants benchmark dependencies included in their development shell, it has to be explicitly enabled here.
|
|
doBenchmark = true;
|
|
};
|
|
|
|
# This is a pseudo Haskell package derivation that contains all the
|
|
# dependencies for the packages in `selected`.
|
|
#
|
|
# This is a derivation created with `haskellPackages.mkDerivation`.
|
|
#
|
|
# pkgWithCombinedDeps :: HaskellDerivation
|
|
pkgWithCombinedDeps = self.mkDerivation (genericBuilderArgsModifier genericBuilderArgs);
|
|
|
|
# The derivation returned from `envFunc` for `pkgWithCombinedDeps`.
|
|
#
|
|
# This is a derivation that can be run with `nix-shell`. It provides a
|
|
# GHC with a package database with all the dependencies of our
|
|
# `selected` packages.
|
|
#
|
|
# This is a derivation created with `stdenv.mkDerivation` (not
|
|
# `haskellPackages.mkDerivation`).
|
|
#
|
|
# pkgWithCombinedDepsDevDrv :: Derivation
|
|
pkgWithCombinedDepsDevDrv = pkgWithCombinedDeps.envFunc { inherit withHoogle; };
|
|
|
|
mkDerivationArgs = builtins.removeAttrs args [ "genericBuilderArgsModifier" "packages" "withHoogle" "doBenchmark" "extraDependencies" ];
|
|
|
|
in pkgWithCombinedDepsDevDrv.overrideAttrs (old: mkDerivationArgs // {
|
|
nativeBuildInputs = old.nativeBuildInputs ++ mkDerivationArgs.nativeBuildInputs or [];
|
|
buildInputs = old.buildInputs ++ mkDerivationArgs.buildInputs or [];
|
|
});
|
|
|
|
ghc = ghc // {
|
|
withPackages = self.ghcWithPackages;
|
|
withHoogle = self.ghcWithHoogle;
|
|
};
|
|
|
|
/*
|
|
Run `cabal sdist` on a source.
|
|
|
|
Unlike `haskell.lib.sdistTarball`, this does not require any dependencies
|
|
to be present, as it uses `cabal-install` instead of building `Setup.hs`.
|
|
This makes `cabalSdist` faster than `sdistTarball`.
|
|
*/
|
|
cabalSdist = {
|
|
src,
|
|
name ? if src?name then "${src.name}-sdist.tar.gz" else "source.tar.gz"
|
|
}:
|
|
pkgs.runCommandLocal name
|
|
{
|
|
inherit src;
|
|
nativeBuildInputs = [
|
|
buildHaskellPackages.cabal-install
|
|
|
|
# TODO after https://github.com/haskell/cabal/issues/8352
|
|
# remove ghc
|
|
self.ghc
|
|
];
|
|
dontUnpack = false;
|
|
} ''
|
|
unpackPhase
|
|
cd "''${sourceRoot:-.}"
|
|
patchPhase
|
|
mkdir out
|
|
HOME=$PWD cabal sdist --output-directory out
|
|
mv out/*.tar.gz $out
|
|
'';
|
|
|
|
/*
|
|
Like `haskell.lib.buildFromSdist`, but using `cabal sdist` instead of
|
|
building `./Setup`.
|
|
|
|
Unlike `haskell.lib.buildFromSdist`, this does not require any dependencies
|
|
to be present. This makes `buildFromCabalSdist` faster than `haskell.lib.buildFromSdist`.
|
|
*/
|
|
buildFromCabalSdist = pkg:
|
|
haskellLib.overrideSrc
|
|
{
|
|
src = self.cabalSdist { inherit (pkg) src; };
|
|
version = pkg.version;
|
|
}
|
|
pkg;
|
|
|
|
/*
|
|
Modify a Haskell package to add shell completion scripts for the
|
|
given executables produced by it. These completion scripts will be
|
|
picked up automatically if the resulting derivation is installed,
|
|
e.g. by `nix-env -i`.
|
|
|
|
This depends on the `--*-completion` flag `optparse-applicative` provides
|
|
automatically. Since we need to invoke installed executables, completions
|
|
are not generated if we are cross-compiling.
|
|
|
|
commands: names of the executables built by the derivation
|
|
pkg: Haskell package that builds the executables
|
|
|
|
Example:
|
|
generateOptparseApplicativeCompletions [ "exec1" "exec2" ] pkg
|
|
|
|
Type: [str] -> drv -> drv
|
|
*/
|
|
generateOptparseApplicativeCompletions =
|
|
self.callPackage (
|
|
{ stdenv }:
|
|
|
|
commands:
|
|
pkg:
|
|
|
|
if stdenv.buildPlatform.canExecute stdenv.hostPlatform
|
|
then lib.foldr haskellLib.__generateOptparseApplicativeCompletion pkg commands
|
|
else pkg
|
|
) { };
|
|
|
|
/*
|
|
Modify given Haskell package to force GHC to employ the LLVM
|
|
codegen backend when compiling. Useful when working around bugs
|
|
in a native codegen backend GHC defaults to.
|
|
|
|
Example:
|
|
forceLlvmCodegenBackend tls
|
|
|
|
Type: drv -> drv
|
|
*/
|
|
forceLlvmCodegenBackend = overrideCabal (drv: {
|
|
configureFlags = drv.configureFlags or [ ] ++ [ "--ghc-option=-fllvm" ];
|
|
buildTools = drv.buildTools or [ ] ++ [ self.llvmPackages.llvm ];
|
|
});
|
|
}
|