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nixpkgs/pkgs/stdenv/default.nix

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# This file chooses a sane default stdenv given the system, platform, etc.
#
# Rather than returning a stdenv, this returns a list of functions---one per
# each bootstrapping stage. See `./booter.nix` for exactly what this list should
# contain.
{ # Args just for stdenvs' usage
lib
# Args to pass on to the pkgset builder, too
, localSystem, crossSystem, config, overlays, crossOverlays ? []
} @ args:
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let
# The native (i.e., impure) build environment. This one uses the
# tools installed on the system outside of the Nix environment,
# i.e., the stuff in /bin, /usr/bin, etc. This environment should
# be used with care, since many Nix packages will not build properly
# with it (e.g., because they require GNU Make).
stagesNative = import ./native args;
# The Nix build environment.
stagesNix = import ./nix (args // { bootStages = stagesNative; });
stagesFreeBSD = import ./freebsd args;
# On Linux systems, the standard build environment consists of Nix-built
# instances glibc and the `standard' Unix tools, i.e., the Posix utilities,
# the GNU C compiler, and so on.
stagesLinux = import ./linux args;
inherit (import ./darwin args) stagesDarwin;
stagesCross = import ./cross args;
stagesCustom = import ./custom args;
# Select the appropriate stages for the platform `system'.
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in
if crossSystem != localSystem || crossOverlays != [] then stagesCross
else if config ? replaceStdenv then stagesCustom
else { # switch
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i686-linux = stagesLinux;
x86_64-linux = stagesLinux;
armv5tel-linux = stagesLinux;
armv6l-linux = stagesLinux;
armv6m-linux = stagesLinux;
armv7a-linux = stagesLinux;
armv7l-linux = stagesLinux;
armv7r-linux = stagesLinux;
armv7m-linux = stagesLinux;
armv8a-linux = stagesLinux;
armv8r-linux = stagesLinux;
armv8m-linux = stagesLinux;
aarch64-linux = stagesLinux;
mipsel-linux = stagesLinux;
powerpc-linux = /* stagesLinux */ stagesNative;
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powerpc64-linux = stagesLinux;
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powerpc64le-linux = stagesLinux;
riscv64-linux = stagesLinux;
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x86_64-darwin = stagesDarwin;
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aarch64-darwin = stagesDarwin;
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x86_64-solaris = stagesNix;
i686-cygwin = stagesNative;
x86_64-cygwin = stagesNative;
x86_64-freebsd = stagesFreeBSD;
}.${localSystem.system} or stagesNative