Cross-compilation to GNU and MinGW available

[Ludovic Courtès]

Hello,

Nixpkgs now features a cross-compilation toolchain for GNU
(aka. GNU/Hurd) from GNU/Linux, using GCC 4.5.0 and a recent Hurd/Mach
snapshot.

I’ve added cross-GNU build jobs (called ‘xbuild_gnu’) to Coreutils,
Patch, and Tar[*], and others may follow, as time permits.  I think it’s
nice to make sure GNU packages can at least build on, well, GNU.

I’m hoping that eventually people at TU Delft will install GNU on one of
the build farm machines, which would allow us to build things natively,
and even run test suites and all.  An alternative would be to use VMs
(Nixpkgs already provides some support for that.)

In related news, a cross-compilation toolchain for MinGW is also
available.  Let me know if you’re interested in it.

Thanks,
Ludo’.

[*] Only one of them failed to build, hint hint.  ;-)

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