nixpkgs/pkgs/system/stdenvs.nix

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# This file defines the various standard build environments.
#
# 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. On other systems,
# we use the native C library.
{system, allPackages}: rec {
gccWrapper = import ../build-support/gcc-wrapper;
genericStdenv = import ../stdenv/generic;
# Trivial environment used for building other environments.
stdenvInitial = (import ../stdenv/initial) {
name = "stdenv-initial";
inherit system;
};
# 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).
stdenvNative = (import ../stdenv/native) {stdenv = stdenvInitial;};
stdenvNativePkgs = allPackages {stdenv = stdenvNative; noSysDirs = false;};
# The Nix build environment.
stdenvNix = (import ../stdenv/nix) {
stdenv = stdenvNative;
pkgs = allPackages {stdenv = stdenvNative; noSysDirs = false;};
};
stdenvNixPkgs = allPackages {stdenv = stdenvNix;};
# The Linux build environment is a fully bootstrapped Nix
# environment, that is, it should contain no external references.
# 1) Build glibc in the Nix build environment. The result is
# pure.
stdenvLinuxGlibc = stdenvNativePkgs.glibc; # !!! should be NixPkgs, but doesn't work
# 2) Construct a stdenv consisting of the native build environment,
# plus the pure glibc.
stdenvLinuxBoot1 = (import ../stdenv/nix-linux/boot.nix) {
stdenv = stdenvNative;
glibc = stdenvLinuxGlibc;
};
# 3) Now we can build packages that will have the Nix glibc.
stdenvLinuxBoot1Pkgs = allPackages {stdenv = stdenvLinuxBoot1;};
# 4) However, since these packages are built by an native C compiler
# and linker, they may well pick up impure references (e.g., bash
# might end up linking against /lib/libncurses). So repeat, but
# now use the Nix-built tools from step 2/3.
stdenvLinuxBoot2 = (import ../stdenv/nix-linux) {
stdenv = stdenvLinuxBoot1;
pkgs = stdenvLinuxBoot1Pkgs;
glibc = stdenvLinuxGlibc;
inherit genericStdenv gccWrapper;
};
# 5) These packages should be pure.
stdenvLinuxBoot2Pkgs = allPackages {stdenv = stdenvLinuxBoot2;};
# 6) So finally we can construct the Nix build environment.
stdenvLinux = (import ../stdenv/nix-linux) {
stdenv = stdenvLinuxBoot2;
pkgs = stdenvLinuxBoot2Pkgs;
glibc = stdenvLinuxGlibc;
inherit genericStdenv gccWrapper;
};
# 7) And we can build all packages against that, but we don't
# rebuild stuff from step 6.
stdenvLinuxPkgs =
allPackages {stdenv = stdenvLinux;} //
{inherit (stdenvLinuxBoot2Pkgs)
gzip bzip2 bash binutils coreutils diffutils findutils gawk gcc
gnumake gnused gnutar gnugrep wget;
} //
{glibc = stdenvLinuxGlibc;};
}