nixpkgs/pkgs/stdenv/default.nix
Lluís Batlle i Rossell 2aba922d30 My first attempt at getting cross compilers in nixpkgs.
My idea is to provide special stdenv expressions that will contain in the path
additional cross compilers. As most expressions for programs accept a stdenv parameter, 
we could substitute this parameter with the special stdenv, which will have a
generic builder that attempts the usual "--target=..." and can additionally
have an env variable like "cross" with the target architecture set.
So, finally we could have additional expressions like this:

bashRealArm = makeOverridable (import ../shells/bash) {
    inherit fetchurl bison;
    stdenv = stdenvCross "armv5tel-unknown-linux-gnueabi";
};

Meanwhile it does not work - I still cannot get the cross-gcc to build.

I think it does not fill the previous expressions with a lot of noise, so I
think it may be a good path to follow.

I only touched some files of the current stdenv: gcc-4.3, kernel headers
2.6.28, glibc 2.9, ...

I tried to use the gcc-cross-wrapper, that may be very outdated. Maybe I will
update it, or update the gcc-wrapper expression to make it fit the cross tools,
but meanwhile I even cannot build gcc, so I have not tested the wrapper.

This new idea on cross compiling is not similar to that of the
nixpkgs/branches/cross-compilation, which mostly added bare new expressions for
anything to be cross compiled, if I understood it correctly.

I cared not to break anything of the usual stdenv in all this work.


svn path=/nixpkgs/branches/stdenv-updates/; revision=18343
2009-11-14 08:11:30 +00:00

63 lines
1.8 KiB
Nix

# 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.
# stdenvType exists to support multiple kinds of stdenvs on the same
# system, e.g., cygwin and mingw builds on i686-cygwin. Most people
# can ignore it.
{system, stdenvType ? system, allPackages ? import ../.., cross ? null}:
assert system != "i686-cygwin" -> system == stdenvType;
rec {
# 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 ./native {
inherit system allPackages;
}).stdenv;
stdenvNativePkgs = allPackages {
bootStdenv = stdenvNative;
noSysDirs = false;
};
# The Nix build environment.
stdenvNix = import ./nix {
stdenv = stdenvNative;
pkgs = stdenvNativePkgs;
};
# Linux standard environment.
stdenvLinux = (import ./linux {inherit system allPackages cross;}).stdenvLinux;
# MinGW/MSYS standard environment.
stdenvMinGW = import ./mingw {
inherit system;
};
# Select the appropriate stdenv for the platform `system'.
stdenv =
if stdenvType == "i686-linux" then stdenvLinux else
if stdenvType == "x86_64-linux" then stdenvLinux else
if stdenvType == "armv5tel-linux" then stdenvLinux else
if stdenvType == "powerpc-linux" then /* stdenvLinux */ stdenvNative else
if stdenvType == "i686-mingw" then stdenvMinGW else
if stdenvType == "i686-darwin" then stdenvNix else
stdenvNative;
}