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crossOverlays only apply to the packages being built, not the build packages. It is useful when you don’t care what is used to build your packages, just what is being built. The idea relies heavily on the cross compiling infrastructure. Using this implies that we need to create a cross stdenv.
57 lines
2 KiB
Nix
57 lines
2 KiB
Nix
# This file chooses a sane default stdenv given the system, platform, etc.
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#
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# Rather than returning a stdenv, this returns a list of functions---one per
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# each bootstrapping stage. See `./booter.nix` for exactly what this list should
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# contain.
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{ # Args just for stdenvs' usage
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lib
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# Args to pass on to the pkgset builder, too
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, localSystem, crossSystem, config, overlays, crossOverlays ? []
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} @ args:
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let
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# The native (i.e., impure) build environment. This one uses the
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# tools installed on the system outside of the Nix environment,
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# i.e., the stuff in /bin, /usr/bin, etc. This environment should
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# be used with care, since many Nix packages will not build properly
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# with it (e.g., because they require GNU Make).
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stagesNative = import ./native args;
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# The Nix build environment.
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stagesNix = import ./nix (args // { bootStages = stagesNative; });
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stagesFreeBSD = import ./freebsd args;
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# On Linux systems, the standard build environment consists of Nix-built
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# instances glibc and the `standard' Unix tools, i.e., the Posix utilities,
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# the GNU C compiler, and so on.
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stagesLinux = import ./linux args;
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inherit (import ./darwin args) stagesDarwin;
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stagesCross = import ./cross args;
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stagesCustom = import ./custom args;
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# Select the appropriate stages for the platform `system'.
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in
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if crossSystem != localSystem || crossOverlays != [] then stagesCross
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else if config ? replaceStdenv then stagesCustom
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else { # switch
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"i686-linux" = stagesLinux;
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"x86_64-linux" = stagesLinux;
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"armv5tel-linux" = stagesLinux;
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"armv6l-linux" = stagesLinux;
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"armv7l-linux" = stagesLinux;
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"aarch64-linux" = stagesLinux;
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"mipsel-linux" = stagesLinux;
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"powerpc-linux" = /* stagesLinux */ stagesNative;
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"powerpc64le-linux" = stagesLinux;
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"x86_64-darwin" = stagesDarwin;
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"x86_64-solaris" = stagesNix;
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"i686-cygwin" = stagesNative;
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"x86_64-cygwin" = stagesNative;
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"x86_64-freebsd" = stagesFreeBSD;
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}.${localSystem.system} or stagesNative
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