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c449a930aa
postBuild can be used to execute user-specific commands on the generated $out environment before finalizing the build. For example, this hook can be used to generate appropriate 'makeWrapper' script for binaries contained in the environment.
98 lines
3.6 KiB
Nix
98 lines
3.6 KiB
Nix
{ stdenv, lib, ghc, llvmPackages, packages, buildEnv, makeWrapper
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, ignoreCollisions ? false, withLLVM ? false
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, postBuild ? ""
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}:
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# This wrapper works only with GHC 6.12 or later.
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assert lib.versionOlder "6.12" ghc.version || ghc.isGhcjs;
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# It's probably a good idea to include the library "ghc-paths" in the
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# compiler environment, because we have a specially patched version of
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# that package in Nix that honors these environment variables
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#
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# NIX_GHC
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# NIX_GHCPKG
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# NIX_GHC_DOCDIR
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# NIX_GHC_LIBDIR
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#
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# instead of hard-coding the paths. The wrapper sets these variables
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# appropriately to configure ghc-paths to point back to the wrapper
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# instead of to the pristine GHC package, which doesn't know any of the
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# additional libraries.
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#
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# A good way to import the environment set by the wrapper below into
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# your shell is to add the following snippet to your ~/.bashrc:
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#
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# if [ -e ~/.nix-profile/bin/ghc ]; then
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# eval $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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isGhcjs = ghc.isGhcjs or false;
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ghc761OrLater = isGhcjs || lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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ghcCommand = if isGhcjs then "ghcjs" else "ghc";
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libDir = "$out/lib/${ghcCommand}-${ghc.version}";
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docDir = "$out/share/doc/ghc/html";
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packageCfgDir = "${libDir}/package.conf.d";
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paths = lib.filter (x: x ? isHaskellLibrary) (lib.closePropagation packages);
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hasLibraries = lib.any (x: x.isHaskellLibrary) paths;
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# CLang is needed on Darwin for -fllvm to work:
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# https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/code-generators.html
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llvm = lib.makeSearchPath "bin"
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([ llvmPackages.llvm ]
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++ lib.optional stdenv.isDarwin llvmPackages.clang);
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in
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if paths == [] && !withLLVM then ghc else
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buildEnv {
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inherit (ghc) name;
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paths = paths ++ [ghc];
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inherit ignoreCollisions;
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postBuild = ''
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. ${makeWrapper}/nix-support/setup-hook
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${lib.optionalString isGhcjs ''
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cp -r "${ghc}/${ghc.libDir}/"* ${libDir}/
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''}
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if test -L "$out/bin"; then
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binTarget="$(readlink -f "$out/bin")"
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rm "$out/bin"
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cp -r "$binTarget" "$out/bin"
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chmod u+w "$out/bin"
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fi
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for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags '"-B$NIX_GHC_LIBDIR"' \
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--set "NIX_GHC" "$out/bin/${ghcCommand}" \
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--set "NIX_GHCPKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_GHC_DOCDIR" "${docDir}" \
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--set "NIX_GHC_LIBDIR" "${libDir}" \
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${lib.optionalString withLLVM ''--prefix "PATH" ":" "${llvm}"''}
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done
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for prg in runghc runhaskell; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags "-f $out/bin/ghc" \
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--set "NIX_GHC" "$out/bin/${ghcCommand}" \
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--set "NIX_GHCPKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_GHC_DOCDIR" "${docDir}" \
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--set "NIX_GHC_LIBDIR" "${libDir}"
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done
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for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
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done
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${lib.optionalString hasLibraries "$out/bin/${ghcCommand}-pkg recache"}
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$out/bin/${ghcCommand}-pkg check
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'' + postBuild;
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} // {
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preferLocalBuild = true;
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inherit (ghc) version meta;
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}
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