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stdenv/darwin: assemble full clang toolchain #94427

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thefloweringash commented Aug 1, 2020

Adapted from main expression for clang 7.

Motivation for this change

Second part of #94426. See that ticket for the main context. This integrates compiler-rt into the toolchain, both from the re-added bootstrap level and for the higher level stdenvs.

I'm not all confident about the composition of the stages or if compiler-rt is rebuilt at the appropriate times.

cc @matthewbauer and @LnL7

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • 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 nixpkgs-review --run "nixpkgs-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)
  • Ensured that relevant documentation is up to date
  • Fits
Adapted from main expression for clang 7.
@thefloweringash thefloweringash force-pushed the thefloweringash:bootstrap-unpack branch from 00cfe87 to 61c7485 Aug 3, 2020
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thefloweringash commented Aug 3, 2020

The current state of this now is able to build perlPackages.LocaleGettext from an updated bootstrap tools. I put together a simple analysis for the structure of the stdenv and verified that this doesn't not change the structure in any interesting way. Since llvmPackages_7.compiler-rt depends on llvm, it is delayed until the same stage as the first llvm rebuild by copying it up from bootstrap tools until then.

The only remaining mystery is if libcxxabi is required. Including it in the same way as the main clang expression causes libcxx to reference two different libcxxabi packages.

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