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5f134ec6cf
For a long time, we've had `crossLibcStdenv`, `*Cross` libc attributes,
and `*bsdCross` pre-libc package sets. This was always bad because
having "cross" things is "not declarative": the naming doesn't reflect
what packages *need* but rather how we *provide* something. This is
ugly, and creates needless friction between cross and native building.
Now, almost all of these `*Cross` attributes are gone: just these are
kept:
- Glibc's and Musl's are kept, because those packages are widely used
and I didn't want to risk changing the native builds of those at this
time.
- generic `libcCross`, `theadsCross`, and friends, because these relate
to the convolulted GCC bootstrap which still needs to be redone.
The BSD and obscure Linux or freestnanding libcs have conversely all
been made to use a new `stdenvNoLibc`, which is like the old
`crossLibcStdenv` except:
1. It usable for native and cross alike
2. It named according to what it *is* ("a standard environment without
libc but with a C compiler"), rather than some non-compositional
jargon ("the stdenv used for building libc when cross compiling",
yuck).
I should have done this change long ago, but I was stymied because of
"infinite recursions". The problem was that in too many cases we are
overriding `stdenv` to *remove* things we don't need, and this risks
cyles since those more minimal stdenvs are used to build things in the
more maximal stdenvs.
The solution is to pass `stage.nix` `stdenvNoCC`, so we can override to
*build up* rather than *tear down*. For now, the full `stdenv` is also
passed, so I don't need to change the native bootstraps, but I can see
this changing as we make things more uniform and clean those up.
(adapted from commit 51f1ecaa59)
(adapted from commit 1743662e55)
108 lines
3.8 KiB
Nix
108 lines
3.8 KiB
Nix
{ lib
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, localSystem, crossSystem, config, overlays, crossOverlays ? []
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}:
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let
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bootStages = import ../. {
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inherit lib localSystem overlays;
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crossSystem = localSystem;
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crossOverlays = [];
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# Ignore custom stdenvs when cross compiling for compatibility
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# Use replaceCrossStdenv instead.
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config = builtins.removeAttrs config [ "replaceStdenv" ];
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};
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in lib.init bootStages ++ [
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# Regular native packages
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(somePrevStage: lib.last bootStages somePrevStage // {
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# It's OK to change the built-time dependencies
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allowCustomOverrides = true;
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})
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# Build tool Packages
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(vanillaPackages: {
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inherit config overlays;
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selfBuild = false;
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stdenv =
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assert vanillaPackages.stdenv.buildPlatform == localSystem;
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assert vanillaPackages.stdenv.hostPlatform == localSystem;
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assert vanillaPackages.stdenv.targetPlatform == localSystem;
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vanillaPackages.stdenv.override { targetPlatform = crossSystem; };
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# It's OK to change the built-time dependencies
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allowCustomOverrides = true;
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})
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# Run Packages
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(buildPackages: let
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adaptStdenv =
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if crossSystem.isStatic
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then buildPackages.stdenvAdapters.makeStatic
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else lib.id;
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stdenvNoCC = adaptStdenv (buildPackages.stdenv.override (old: rec {
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buildPlatform = localSystem;
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hostPlatform = crossSystem;
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targetPlatform = crossSystem;
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# Prior overrides are surely not valid as packages built with this run on
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# a different platform, and so are disabled.
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overrides = _: _: {};
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extraBuildInputs = [ ]; # Old ones run on wrong platform
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allowedRequisites = null;
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cc = null;
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hasCC = false;
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extraNativeBuildInputs = old.extraNativeBuildInputs
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++ lib.optionals
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(hostPlatform.isLinux && !buildPlatform.isLinux)
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[ buildPackages.patchelf ]
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++ lib.optional
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(let f = p: !p.isx86 || builtins.elem p.libc [ "musl" "wasilibc" "relibc" ] || p.isiOS || p.isGenode;
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in f hostPlatform && !(f buildPlatform) )
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buildPackages.updateAutotoolsGnuConfigScriptsHook
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;
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}));
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in {
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inherit config;
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overlays = overlays ++ crossOverlays;
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selfBuild = false;
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inherit stdenvNoCC;
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stdenv = let
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inherit (stdenvNoCC) hostPlatform targetPlatform;
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baseStdenv = stdenvNoCC.override {
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# Old ones run on wrong platform
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extraBuildInputs = lib.optionals hostPlatform.isDarwin [
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buildPackages.targetPackages.darwin.apple_sdk.frameworks.CoreFoundation
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];
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hasCC = !stdenvNoCC.targetPlatform.isGhcjs;
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cc = if crossSystem.useiOSPrebuilt or false
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then buildPackages.darwin.iosSdkPkgs.clang
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else if crossSystem.useAndroidPrebuilt or false
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then buildPackages."androidndkPkgs_${crossSystem.ndkVer}".clang
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else if targetPlatform.isGhcjs
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# Need to use `throw` so tryEval for splicing works, ugh. Using
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# `null` or skipping the attribute would cause an eval failure
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# `tryEval` wouldn't catch, wrecking accessing previous stages
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# when there is a C compiler and everything should be fine.
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then throw "no C compiler provided for this platform"
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else if crossSystem.isDarwin
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then buildPackages.llvmPackages.libcxxClang
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else if crossSystem.useLLVM or false
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then buildPackages.llvmPackages.clang
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else if crossSystem.useZig or false
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then buildPackages.zig.cc
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else if crossSystem.useArocc or false
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then buildPackages.arocc
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else buildPackages.gcc;
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};
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in if config ? replaceCrossStdenv then config.replaceCrossStdenv { inherit buildPackages baseStdenv; } else baseStdenv;
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})
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]
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