50 lines
1.7 KiB
Nix
50 lines
1.7 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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stagesDarwin = import ./darwin args;
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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 if localSystem.isLinux then stagesLinux
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else if localSystem.isDarwin then stagesDarwin
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else # misc special cases
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{ # switch
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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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