Switch stdenvs to pure-darwin

[pikajude]

This is to go along with my ML message requesting a default stdenv switch to pure-darwin. The reactions have been positive so far!

@edolstra

[Ericson2314]

Should we change the names to stdenvDarwin and stdenvDarwinImpure or something to reflect the new default?

[henrytill]

👍

[codedmart]

👍

[acowley]

I already 👍 'd on the mailing list, but, just in case it can help un-wedge this, here's another 👍 !

It'd be great to get this ball rolling again.

[copumpkin]

👍 👍 🍻 🍻

[benley]

🏆 👍

[vcunat]

You rejoice too early, as the stdenv won't build on Hydra. http://hydra.nixos.org/build/26728682

[datakurre]

Does this require patches on top of Nix 1.10? Is NixOS/nix#562 enough? (From the build error it looks like that pull is required.)

[copumpkin]

@vcunat http://www.nooooooooooooooo.com/

[copumpkin]

I think Hydra needs a different nix.conf. Not sure how that sort of thing is managed!

[rbvermaa]

@copumpkin what kind of changes does nix.conf need?

[edolstra]

Note that the failing derivation (/nix/store/y3n191kgrrvc4r3rafz5hb919id8njs2-mkdir.drv) has system set to x86_64-linux, which I assume should be x86_64-darwin. Our Mac does not have sandbox builds enabled BTW.

[edolstra]

This is probably due to:

pkgs/stdenv/pure-darwin/default.nix:{ system      ? builtins.currentSystem
pkgs/stdenv/pure-darwin/make-bootstrap-tools.nix:{system ? builtins.currentSystem}:

[edolstra]

Now that pure-darwin is the default, should we get rid of the old darwin stdenv?

[pikajude]

@edolstra I'd be fine with leaving it until Apple stops distributing Xcode 6, but the users need to be made aware it won't work on OSes newer than 10.9 or with Xcode 7.