nixpkgs/pkgs/stdenv/linux/default.nix

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# This file constructs the standard build environment for the
# Linux/i686 platform. It's completely pure; that is, it relies on no
# external (non-Nix) tools, such as /usr/bin/gcc, and it contains a C
# compiler and linker that do not search in default locations,
# ensuring purity of components produced by it.
# The function defaults are for easy testing.
{system ? "i686-linux", allPackages ? import ../../top-level/all-packages.nix}:
rec {
bootstrapFiles =
if system == "i686-linux" then import ./bootstrap/i686
else if system == "x86_64-linux" then import ./bootstrap/x86_64
else if system == "powerpc-linux" then import ./bootstrap/powerpc
else abort "unsupported platform for the pure Linux stdenv";
# The bootstrap process proceeds in several steps.
# 1) Create a standard environment by downloading pre-built binaries
# of coreutils, GCC, etc.
# This function downloads a file.
download = {url, sha256}: derivation {
name = baseNameOf (toString url);
builder = bootstrapFiles.sh;
inherit system url;
inherit (bootstrapFiles) bzip2 mkdir curl cpio ln;
args = [ ./scripts/download.sh ];
outputHashAlgo = "sha256";
outputHash = sha256;
impureEnvVars = [ "http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy" ];
};
# Download and unpack the bootstrap tools (coreutils, GCC, Glibc, ...).
bootstrapTools = derivation {
name = "bootstrap-tools";
builder = bootstrapFiles.sh;
args = [ ./scripts/unpack-bootstrap-tools.sh ];
inherit (bootstrapFiles) bzip2 mkdir curl cpio;
tarball = download {
inherit (bootstrapFiles.bootstrapTools) url sha256;
};
inherit system;
# Needed by the GCC wrapper.
langC = true;
langCC = true;
};
# This function builds the various standard environments used during
# the bootstrap.
stdenvBootFun =
{gcc, extraAttrs ? {}, extraPath ? [], fetchurl}:
import ../generic {
inherit system;
name = "stdenv-linux-boot";
param1 = bootstrapTools;
preHook = builtins.toFile "prehook.sh"
''
export LD_LIBRARY_PATH=$param1/lib
export NIX_ENFORCE_PURITY=1
havePatchELF=1
# Don't patch #!/interpreter because it leads to retained
# dependencies on the bootstrapTools in the final stdenv.
dontPatchShebangs=1
'';
shell = "${bootstrapTools}/bin/sh";
initialPath = [bootstrapTools] ++ extraPath;
fetchurlBoot = fetchurl;
inherit gcc;
extraAttrs = extraAttrs // {inherit fetchurl;};
};
# Build a dummy stdenv with no GCC or working fetchurl. This is
# because we need a stdenv to build the GCC wrapper and fetchurl.
stdenvLinuxBoot0 = stdenvBootFun {
gcc = "/no-such-path";
fetchurl = null;
};
fetchurl = import ../../build-support/fetchurl {
stdenv = stdenvLinuxBoot0;
curl = bootstrapTools;
};
# The Glibc include directory cannot have the same prefix as the GCC
# include directory, since GCC gets confused otherwise (it will
# search the Glibc headers before the GCC headers). So create a
# dummy Glibc.
bootstrapGlibc = stdenvLinuxBoot0.mkDerivation {
name = "bootstrap-glibc";
buildCommand = ''
ensureDir $out
ln -s ${bootstrapTools}/lib $out/lib
ln -s ${bootstrapTools}/include-glibc $out/include
'';
};
# A helper function to call gcc-wrapper.
wrapGCC =
{gcc ? bootstrapTools, libc, binutils, shell ? "", name ? "bootstrap-gcc"}:
import ../../build-support/gcc-wrapper {
nativeTools = false;
nativeLibc = false;
inherit gcc binutils libc shell name;
stdenv = stdenvLinuxBoot0;
};
# Create the first "real" standard environment. This one consists
# of bootstrap tools only, and a minimal Glibc to keep the GCC
# configure script happy.
stdenvLinuxBoot1 = stdenvBootFun {
gcc = wrapGCC {libc = bootstrapGlibc; binutils = bootstrapTools;};
inherit fetchurl;
};
# 2) These are the packages that we can build with the first
# stdenv. We only need Glibc (in step 3).
stdenvLinuxBoot1Pkgs = allPackages {
inherit system;
bootStdenv = stdenvLinuxBoot1;
};
# 3) Build Glibc with the bootstrap tools. The result is the full,
# dynamically linked, final Glibc.
stdenvLinuxGlibc = stdenvLinuxBoot1Pkgs.glibc;
# 4) Construct a second stdenv identical to the first, except that
# this one uses the Glibc built in step 3. It still uses
# the rest of the bootstrap tools, including GCC.
stdenvLinuxBoot2 = removeAttrs (stdenvBootFun {
gcc = wrapGCC {binutils = bootstrapTools; libc = stdenvLinuxGlibc;};
extraAttrs = {glibc = stdenvLinuxGlibc;};
inherit fetchurl;
}) ["gcc" "binutils"];
# 5) The packages that can be built using the second stdenv.
stdenvLinuxBoot2Pkgs = allPackages {
inherit system;
bootStdenv = stdenvLinuxBoot2;
};
# 6) Construct a third stdenv identical to the second, except that
# this one uses the dynamically linked GCC and Binutils from step
# 5. The other tools (e.g. coreutils) are still from the
# bootstrap tools.
stdenvLinuxBoot3 = stdenvBootFun {
gcc = wrapGCC rec {
inherit (stdenvLinuxBoot2Pkgs) binutils;
libc = stdenvLinuxGlibc;
gcc = stdenvLinuxBoot2Pkgs.gcc.gcc;
name = gcc.name;
};
inherit fetchurl;
};
# 7) The packages that can be built using the third stdenv.
stdenvLinuxBoot3Pkgs = allPackages {
inherit system;
bootStdenv = stdenvLinuxBoot3;
};
# 8) Construct the final stdenv. It uses the Glibc, GCC and
# Binutils built above, and adds in dynamically linked versions
# of all other tools.
#
# When updating stdenvLinux, make sure that the result has no
# dependency (`nix-store -qR') on bootstrapTools.
stdenvLinux = import ../generic {
name = "stdenv-linux";
inherit system;
preHook = builtins.toFile "prehook.sh"
''
export NIX_ENFORCE_PURITY=1
havePatchELF=1
'';
initialPath = [
((import ../common-path.nix) {pkgs = stdenvLinuxBoot3Pkgs;})
stdenvLinuxBoot3Pkgs.patchelf
];
gcc = wrapGCC rec {
inherit (stdenvLinuxBoot2Pkgs) binutils;
libc = stdenvLinuxGlibc;
gcc = stdenvLinuxBoot2Pkgs.gcc.gcc;
shell = stdenvLinuxBoot3Pkgs.bash + "/bin/sh";
name = gcc.name;
};
shell = stdenvLinuxBoot3Pkgs.bash + "/bin/sh";
fetchurlBoot = fetchurl;
extraAttrs = {
inherit (stdenvLinuxBoot2Pkgs) binutils /* gcc */ glibc;
inherit (stdenvLinuxBoot3Pkgs)
gzip bzip2 bash coreutils diffutils findutils gawk
gnumake gnused gnutar gnugrep patch patchelf
attr acl;
};
};
}