307 lines
11 KiB
Nix
307 lines
11 KiB
Nix
/* This file contains various functions that take a stdenv and return
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a new stdenv with different behaviour, e.g. using a different C
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compiler. */
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pkgs:
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rec {
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# Override the compiler in stdenv for specific packages.
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overrideGCC = stdenv: gcc: stdenv.override { inherit gcc; };
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# Add some arbitrary packages to buildInputs for specific packages.
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# Used to override packages in stdenv like Make. Should not be used
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# for other dependencies.
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overrideInStdenv = stdenv: pkgs:
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stdenv.override (prev: { extraBuildInputs = prev.extraBuildInputs or [] ++ pkgs; });
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# Override the setup script of stdenv. Useful for testing new
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# versions of the setup script without causing a rebuild of
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# everything.
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#
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# Example:
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# randomPkg = import ../bla { ...
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# stdenv = overrideSetup stdenv ../stdenv/generic/setup-latest.sh;
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# };
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overrideSetup = stdenv: setupScript: stdenv.override { inherit setupScript; };
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# Return a modified stdenv that uses dietlibc to create small
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# statically linked binaries.
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useDietLibC = stdenv: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // {
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NIX_CFLAGS_LINK = "-static";
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# libcompat.a contains some commonly used functions.
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NIX_LDFLAGS = "-lcompat";
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# These are added *after* the command-line flags, so we'll
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# always optimise for size.
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NIX_CFLAGS_COMPILE =
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args.NIX_CFLAGS_COMPILE or ""
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+ " -Os -s -D_BSD_SOURCE=1";
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configureFlags =
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args.configureFlags or ""
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+ " --disable-shared"; # brrr...
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NIX_GCC = import ../build-support/gcc-wrapper {
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inherit stdenv;
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libc = pkgs.dietlibc;
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inherit (stdenv.gcc) gcc binutils nativeTools nativePrefix;
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nativeLibc = false;
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};
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});
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isDietLibC = true;
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};
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# Return a modified stdenv that uses klibc to create small
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# statically linked binaries.
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useKlibc = stdenv: klibc: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // {
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NIX_CFLAGS_LINK = "-static";
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# These are added *after* the command-line flags, so we'll
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# always optimise for size.
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NIX_CFLAGS_COMPILE =
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args.NIX_CFLAGS_COMPILE or "" + " -Os -s";
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configureFlags =
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args.configureFlags or "" + " --disable-shared"; # brrr...
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NIX_GCC = pkgs.runCommand "klibc-wrapper" {} ''
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mkdir -p $out/bin
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ln -s ${klibc}/bin/klcc $out/bin/gcc
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ln -s ${klibc}/bin/klcc $out/bin/cc
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mkdir -p $out/nix-support
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echo 'PATH=$PATH:${stdenv.gcc.binutils}/bin' > $out/nix-support/setup-hook
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'';
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});
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isKlibc = true;
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isStatic = true;
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};
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# Return a modified stdenv that tries to build statically linked
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# binaries.
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makeStaticBinaries = stdenv: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // {
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NIX_CFLAGS_LINK = "-static";
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configureFlags =
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toString args.configureFlags or ""
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+ " --disable-shared"; # brrr...
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});
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isStatic = true;
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};
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# Return a modified stdenv that builds static libraries instead of
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# shared libraries.
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makeStaticLibraries = stdenv: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // {
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dontDisableStatic = true;
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configureFlags =
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toString args.configureFlags or ""
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+ " --enable-static --disable-shared";
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});
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};
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# Return a modified stdenv that adds a cross compiler to the
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# builds.
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makeStdenvCross = stdenv: cross: binutilsCross: gccCross: stdenv //
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{ mkDerivation = {name ? "", buildInputs ? [], nativeBuildInputs ? [],
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propagatedBuildInputs ? [], propagatedNativeBuildInputs ? [],
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selfNativeBuildInput ? false, ...}@args: let
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# *BuildInputs exists temporarily as another name for
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# *HostInputs.
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# In nixpkgs, sometimes 'null' gets in as a buildInputs element,
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# and we handle that through isAttrs.
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getNativeDrv = drv: drv.nativeDrv or drv;
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getCrossDrv = drv: drv.crossDrv or drv;
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nativeBuildInputsDrvs = map getNativeDrv nativeBuildInputs;
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buildInputsDrvs = map getCrossDrv buildInputs;
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buildInputsDrvsAsBuildInputs = map getNativeDrv buildInputs;
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propagatedBuildInputsDrvs = map getCrossDrv propagatedBuildInputs;
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propagatedNativeBuildInputsDrvs = map getNativeDrv propagatedNativeBuildInputs;
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# The base stdenv already knows that nativeBuildInputs and
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# buildInputs should be built with the usual gcc-wrapper
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# And the same for propagatedBuildInputs.
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nativeDrv = stdenv.mkDerivation args;
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# Temporary expression until the cross_renaming, to handle the
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# case of pkgconfig given as buildInput, but to be used as
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# nativeBuildInput.
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hostAsNativeDrv = drv:
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builtins.unsafeDiscardStringContext drv.nativeDrv.drvPath
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== builtins.unsafeDiscardStringContext drv.crossDrv.drvPath;
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buildInputsNotNull = stdenv.lib.filter
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(drv: builtins.isAttrs drv && drv ? nativeDrv) buildInputs;
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nativeInputsFromBuildInputs = stdenv.lib.filter hostAsNativeDrv buildInputsNotNull;
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# We should overwrite the input attributes in crossDrv, to overwrite
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# the defaults for only-native builds in the base stdenv
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crossDrv = if cross == null then nativeDrv else
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stdenv.mkDerivation (args // {
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name = name + "-" + cross.config;
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nativeBuildInputs = nativeBuildInputsDrvs
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++ nativeInputsFromBuildInputs
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++ [ gccCross binutilsCross ] ++
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stdenv.lib.optional selfNativeBuildInput nativeDrv;
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# Cross-linking dynamic libraries, every buildInput should
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# be propagated because ld needs the -rpath-link to find
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# any library needed to link the program dynamically at
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# loader time. ld(1) explains it.
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buildInputs = [];
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propagatedBuildInputs = propagatedBuildInputsDrvs ++ buildInputsDrvs;
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propagatedNativeBuildInputs = propagatedNativeBuildInputsDrvs;
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crossConfig = cross.config;
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} // args.crossAttrs or {});
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in nativeDrv // {
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inherit crossDrv nativeDrv;
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};
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} // {
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inherit cross gccCross binutilsCross;
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};
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/* Modify a stdenv so that the specified attributes are added to
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every derivation returned by its mkDerivation function.
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Example:
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stdenvNoOptimise =
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addAttrsToDerivation
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{ NIX_CFLAGS_COMPILE = "-O0"; }
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stdenv;
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*/
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addAttrsToDerivation = extraAttrs: stdenv: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // extraAttrs); };
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/* Return a modified stdenv that builds packages with GCC's coverage
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instrumentation. The coverage note files (*.gcno) are stored in
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$out/.build, along with the source code of the package, to enable
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programs like lcov to produce pretty-printed reports.
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*/
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addCoverageInstrumentation = stdenv:
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overrideInStdenv stdenv [ pkgs.enableGCOVInstrumentation pkgs.keepBuildTree ];
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/* Replace the meta.maintainers field of a derivation. This is useful
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when you want to fork to update some packages without disturbing other
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developers.
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e.g.: in all-packages.nix:
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# remove all maintainers.
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defaultStdenv = replaceMaintainersField allStdenvs.stdenv pkgs [];
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*/
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replaceMaintainersField = stdenv: pkgs: maintainers: stdenv //
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{ mkDerivation = args:
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stdenv.lib.recursiveUpdate
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(stdenv.mkDerivation args)
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{ meta.maintainers = maintainers; };
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};
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/* Use the trace output to report all processed derivations with their
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license name.
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*/
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traceDrvLicenses = stdenv: stdenv //
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{ mkDerivation = args:
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let
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pkg = stdenv.mkDerivation args;
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printDrvPath = val: let
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drvPath = builtins.unsafeDiscardStringContext pkg.drvPath;
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license = pkg.meta.license or null;
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in
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builtins.trace "@:drv:${toString drvPath}:${builtins.toString license}:@" val;
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in pkg // {
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outPath = printDrvPath pkg.outPath;
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drvPath = printDrvPath pkg.drvPath;
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};
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};
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/* Abort if the license predicate is not verified for a derivation
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declared with mkDerivation.
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One possible predicate to avoid all non-free packages can be achieved
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with the following function:
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isFree = license: with builtins;
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if isNull license then true
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else if isList license then lib.all isFree license
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else license != "non-free" && license != "unfree";
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This adapter can be defined on the defaultStdenv definition. You can
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use it by patching the all-packages.nix file or by using the override
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feature of ~/.nixpkgs/config.nix .
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*/
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validateLicenses = licensePred: stdenv: stdenv //
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{ mkDerivation = args:
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let
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pkg = stdenv.mkDerivation args;
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drv = builtins.unsafeDiscardStringContext pkg.drvPath;
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license =
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pkg.meta.license or
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# Fixed-output derivations such as source tarballs usually
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# don't have licensing information, but that's OK.
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(pkg.outputHash or
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(builtins.trace
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"warning: ${drv} lacks licensing information" null));
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validate = arg:
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if licensePred license then arg
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else abort ''
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while building ${drv}:
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license `${builtins.toString license}' does not pass the predicate.
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'';
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in pkg // {
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outPath = validate pkg.outPath;
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drvPath = validate pkg.drvPath;
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};
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};
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/* Modify a stdenv so that it produces debug builds; that is,
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binaries have debug info, and compiler optimisations are
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disabled. */
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keepDebugInfo = stdenv: stdenv //
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{ mkDerivation = args: stdenv.mkDerivation (args // {
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dontStrip = true;
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NIX_CFLAGS_COMPILE = toString (args.NIX_CFLAGS_COMPILE or "") + " -g -O0";
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});
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};
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/* Modify a stdenv so that it uses the Gold linker. FIXME: should
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use -fuse-ld=gold instead, but then the ld-wrapper won't be
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invoked. */
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useGoldLinker = stdenv:
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let
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binutils = stdenv.gcc.binutils;
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binutils' = pkgs.runCommand "${binutils.name}-gold" { }
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''
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mkdir -p $out/bin
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ln -s ${binutils}/bin/* $out/bin/
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ln -sfn ${binutils}/bin/ld.gold $out/bin/ld
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''; # */
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in overrideGCC stdenv (stdenv.gcc.override { binutils = binutils'; });
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dropCxx = drv: drv.override {
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stdenv = if pkgs.stdenv.isDarwin
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then pkgs.allStdenvs.stdenvDarwinNaked
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else pkgs.stdenv;
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};
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}
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