77bf1395d6
Make both ready for cross with prefixes
Currently
`pkgsCross.aarch64-multiplatform.mold.passthru.tests.{wrapped,adapter}`
fail with
```
Testing running the 'hello' binary which should be linked with 'mold'
Hello, world!
Checking for mold in the '.comment' section
No mention of 'mold' detected in the '.comment' section
The command was:
aarch64-unknown-linux-gnu-readelf -p .comment ...bin/hello
The output was:
String dump of section '.comment':
[ 0] GCC: (GNU) 12.3.0
```
252 lines
9.5 KiB
Nix
252 lines
9.5 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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{ lib, pkgs, config }:
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let
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# N.B. Keep in sync with default arg for stdenv/generic.
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defaultMkDerivationFromStdenv = import ./generic/make-derivation.nix { inherit lib config; };
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# Low level function to help with overriding `mkDerivationFromStdenv`. One
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# gives it the old stdenv arguments and a "continuation" function, and
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# underneath the final stdenv argument it yields to the continuation to do
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# whatever it wants with old `mkDerivation` (old `mkDerivationFromStdenv`
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# applied to the *new, final* stdenv) provided for convenience.
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withOldMkDerivation = stdenvSuperArgs: k: stdenvSelf: let
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mkDerivationFromStdenv-super = stdenvSuperArgs.mkDerivationFromStdenv or defaultMkDerivationFromStdenv;
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mkDerivationSuper = mkDerivationFromStdenv-super stdenvSelf;
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in
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k stdenvSelf mkDerivationSuper;
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# Wrap the original `mkDerivation` providing extra args to it.
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extendMkDerivationArgs = old: f: withOldMkDerivation old (_: mkDerivationSuper: args:
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(mkDerivationSuper args).overrideAttrs f);
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# Wrap the original `mkDerivation` transforming the result.
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overrideMkDerivationResult = old: f: withOldMkDerivation old (_: mkDerivationSuper: args:
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f (mkDerivationSuper args));
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in
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rec {
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# Override the compiler in stdenv for specific packages.
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overrideCC = stdenv: cc: stdenv.override { allowedRequisites = null; cc = cc; };
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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: { allowedRequisites = null; 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 tries to build statically linked
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# binaries.
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makeStaticBinaries = stdenv0:
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stdenv0.override (old: {
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mkDerivationFromStdenv = withOldMkDerivation old (stdenv: mkDerivationSuper: args:
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if stdenv.hostPlatform.isDarwin
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then throw "Cannot build fully static binaries on Darwin/macOS"
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else (mkDerivationSuper args).overrideAttrs(finalAttrs: {
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NIX_CFLAGS_LINK = toString (finalAttrs.NIX_CFLAGS_LINK or "") + " -static";
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} // lib.optionalAttrs (!(finalAttrs.dontAddStaticConfigureFlags or false)) {
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configureFlags = (finalAttrs.configureFlags or []) ++ [
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"--disable-shared" # brrr...
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];
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}));
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} // lib.optionalAttrs (stdenv0.hostPlatform.libc == "glibc") {
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extraBuildInputs = (old.extraBuildInputs or []) ++ [
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pkgs.glibc.static
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];
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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:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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dontDisableStatic = true;
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} // lib.optionalAttrs (!(args.dontAddStaticConfigureFlags or false)) {
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configureFlags = (args.configureFlags or []) ++ [
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"--enable-static"
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"--disable-shared"
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];
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cmakeFlags = (args.cmakeFlags or []) ++ [ "-DBUILD_SHARED_LIBS:BOOL=OFF" ];
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mesonFlags = (args.mesonFlags or []) ++ [ "-Ddefault_library=static" ];
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});
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});
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# Best effort static binaries. Will still be linked to libSystem,
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# but more portable than Nix store binaries.
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makeStaticDarwin = stdenv: stdenv.override (old: {
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# extraBuildInputs are dropped in cross.nix, but darwin still needs them
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extraBuildInputs = [ pkgs.buildPackages.darwin.CF ];
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mkDerivationFromStdenv = withOldMkDerivation old (stdenv: mkDerivationSuper: args:
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(mkDerivationSuper args).overrideAttrs (finalAttrs: {
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NIX_CFLAGS_LINK = toString (finalAttrs.NIX_CFLAGS_LINK or "")
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+ lib.optionalString (stdenv.cc.isGNU or false) " -static-libgcc";
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nativeBuildInputs = (finalAttrs.nativeBuildInputs or [])
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++ lib.optionals stdenv.hasCC [
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(pkgs.buildPackages.makeSetupHook {
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name = "darwin-portable-libSystem-hook";
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substitutions = {
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libsystem = "${stdenv.cc.libc}/lib/libSystem.B.dylib";
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targetPrefix = stdenv.cc.bintools.targetPrefix;
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};
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} ./darwin/portable-libsystem.sh)
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];
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}));
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});
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# Puts all the other ones together
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makeStatic = stdenv: lib.foldl (lib.flip lib.id) stdenv (
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lib.optional stdenv.hostPlatform.isDarwin makeStaticDarwin
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++ [ makeStaticLibraries propagateBuildInputs ]
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# Apple does not provide a static version of libSystem or crt0.o
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# So we can’t build static binaries without extensive hacks.
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++ lib.optional (!stdenv.hostPlatform.isDarwin) makeStaticBinaries
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);
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/* Modify a stdenv so that all buildInputs are implicitly propagated to
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consuming derivations
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*/
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propagateBuildInputs = stdenv:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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propagatedBuildInputs = (args.propagatedBuildInputs or []) ++ (args.buildInputs or []);
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buildInputs = [];
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});
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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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{ env.NIX_CFLAGS_COMPILE = "-O0"; }
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stdenv;
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*/
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addAttrsToDerivation = extraAttrs: stdenv: stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (_: extraAttrs);
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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:
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stdenv.override (old: {
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mkDerivationFromStdenv = overrideMkDerivationResult (pkg:
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let
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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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/* 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:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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dontStrip = true;
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env = (args.env or {}) // { NIX_CFLAGS_COMPILE = toString (args.env.NIX_CFLAGS_COMPILE or "") + " -ggdb -Og"; };
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});
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});
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/* Modify a stdenv so that it uses the Gold linker. */
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useGoldLinker = stdenv:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -fuse-ld=gold";
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});
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});
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useMoldLinker = stdenv: let
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bintools = stdenv.cc.bintools.override {
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extraBuildCommands = ''
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wrap ${stdenv.cc.bintools.targetPrefix}ld.mold ${../build-support/bintools-wrapper/ld-wrapper.sh} ${pkgs.mold}/bin/ld.mold
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wrap ${stdenv.cc.bintools.targetPrefix}ld ${../build-support/bintools-wrapper/ld-wrapper.sh} ${pkgs.mold}/bin/ld.mold
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'';
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};
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in stdenv.override (old: {
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cc = stdenv.cc.override {
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inherit bintools;
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};
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allowedRequisites =
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lib.mapNullable (rs: rs ++ [ bintools pkgs.mold (lib.getLib pkgs.mimalloc) (lib.getLib pkgs.openssl) ]) (stdenv.allowedRequisites or null);
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# gcc >12.1.0 supports '-fuse-ld=mold'
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# the wrap ld above in bintools supports gcc <12.1.0 and shouldn't harm >12.1.0
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# https://github.com/rui314/mold#how-to-use
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} // lib.optionalAttrs (stdenv.cc.isClang || (stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "12")) {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -fuse-ld=mold";
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});
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});
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/* Modify a stdenv so that it builds binaries optimized specifically
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for the machine they are built on.
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WARNING: this breaks purity! */
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impureUseNativeOptimizations = stdenv:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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env = (args.env or {}) // { NIX_CFLAGS_COMPILE = toString (args.env.NIX_CFLAGS_COMPILE or "") + " -march=native"; };
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NIX_ENFORCE_NO_NATIVE = false;
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preferLocalBuild = true;
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allowSubstitutes = false;
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});
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});
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/* Modify a stdenv so that it builds binaries with the specified list of
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compilerFlags appended and passed to the compiler.
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This example would recompile every derivation on the system with
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-funroll-loops and -O3 passed to each gcc invocation.
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Example:
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nixpkgs.overlays = [
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(self: super: {
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stdenv = super.withCFlags [ "-funroll-loops" "-O3" ] super.stdenv;
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})
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];
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*/
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withCFlags = compilerFlags: stdenv:
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stdenv.override (old: {
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mkDerivationFromStdenv = extendMkDerivationArgs old (args: {
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env = (args.env or {}) // { NIX_CFLAGS_COMPILE = toString (args.env.NIX_CFLAGS_COMPILE or "") + " ${toString compilerFlags}"; };
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});
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});
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}
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