Update macOS to 10.12

[matthewbauer]

Motivation for this change

This is big enough that it probably needs its own jobset. This bumps the SDKs to 10.12, as well as adds symbols only available in 10.12. As a result, this means that Nixpkgs will only work on systems with macOS 10.12+.

Other things done:

• In addition, I've brought back the cross patch shebangs work. It needed some tweaking to get things working but the final result doesn't leak bootstrap-tools.
• Removed some old patches that should not be needed with newer SDKs.
• Update LLVM to 7 everywhere (/cc @dtzWill). Based off of LLVM 8 (currently on -rc3) #56490.
• Add libtapi support for cctools. This is just a flag to cctools-port that it can use.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

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[matthewbauer]

Oh, does cf-private add -framework CoreFoundation? If so we can probably get rid of it in a bunch of other places.

It adds /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation to get the objc runtime. It should only be needed if you get errors like:

_OBJC_CLASS_$_NSArray is undefined

[matthewbauer]

If you are just missing _NS* symbols you just need -framework CoreFoundation

[ThomasMader]

I recognized that you disabled the entire checkPhase for ldc on Darwin.
The error coming from there seems to me to be very serious. I think ldc might have trouble working correctly making it unusable on Darwin.

For dmd the commented make line in the checkPhase should work now again with your changes about the filesystem stuff in the linker and should fix #57120 .

[matthewbauer]

I recognized that you disabled the entire checkPhase for ldc on Darwin.
The error coming from there seems to me to be very serious. I think ldc might have trouble working correctly making it unusable on Darwin.

For dmd the commented make line in the checkPhase should work now again with your changes about the filesystem stuff in the linker and should fix #57120 .

I was able to compile and run some simple D code, but I can work on getting the tests passing as well

[nixos-discourse]

This pull request has been mentioned on Nix community. There might be relevant details there:

https://discourse.nixos.org/t/darwin-macos-10-12-stdenv-updates/2862/1

[LnL7]

@matthewbauer After reading your post I realised that we didn't update MACOSX_DEPLOYMENT_TARGET, not a big deal but perhaps we should?

[matthewbauer]

@matthewbauer After reading your post I realised that we didn't update MACOSX_DEPLOYMENT_TARGET, not a big deal but perhaps we should?

Yeah that would be a good idea! Also removing the gl_cv_func_getcwd_abort_bug thing should be possible