forked from mirrors/nixpkgs
a845397040
In preparation for bumping the LLVM used by Darwin, this change refactors and reworks the stdenv build process. When it made sense, existing behaviors were kept to avoid causing any unwanted breakage. However, there are some differences. The reasoning and differences are discussed below. - Improved cycle times - Working on the Darwin stdenv was a tedious process because `allowedRequisites` determined what was allowed between stages. If you made a mistake, you might have to wait a considerable amount of time for the build to fail. Using assertions makes many errors fail at evaluation time and makes moving things around safer and easier to do. - Decoupling from bootstrap tools - The stdenv build process builds as much as it can in the early stages to remove the requirement that the bootstrap tools need bumped in order to bump the stdenv itself. This should lower the barrier to updates and make it easier to bump in the future. It also allows changes to be made without requiring additional tools be added to the bootstrap tools. - Patterned after the Linux stdenv - I tried to follow the patterns established in the Linux stdenv with adaptations made to Darwin’s needs. My hope is this makes the Darwin stdenv more approable for non-Darwin developers who made need to interact with it. It also allowed some of the hacks to be removed. - Documentation - Comments were added explaining what was happening and why things were being done. This is particular important for some stages that might not be obvious (such as the sysctl stage). - Cleanup - Converting the intermediate `allowedRequisites` to assertions revealed that many packages were being referenced that no longer exist or have been renamed. Removing them reduces clutter and should help make the stdenv bootstrap process be more understandable.
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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