ci: Rework CI for Darwin

added CI label

changed the description

added 5 commits

e69a8cf9 - ci: Isolate build from HOME
30db6d18 - ci: Move phase timing logic into ci.sh
7823caa1 - ci: More surgical use of nix in Darwin builds
9b8d0b2a - configure: Move nm search logic to new file
d97d6cf7 - configure: Add check for whether CC supports --target

Compare with previous version

added 5 commits

b237af0f - ci: Isolate build from HOME
e4ab3fac - ci: Move phase timing logic into ci.sh
9e3ec133 - ci: More surgical use of nix in Darwin builds
828d25c6 - configure: Move nm search logic to new file
31b9006e - configure: Add check for whether CC supports --target

Compare with previous version

added 1 commit

6d33bcc7 - ci: Add version to cache key

Compare with previous version

added 8 commits

43c78181 - ci: Drop redundant `cabal update`s
a0d10347 - ci: Consolidate handling of cabal cache
e657898c - ci: Isolate build from HOME
c7a661ad - ci: Move phase timing logic into ci.sh
ccd3de53 - ci: More surgical use of nix in Darwin builds
25750408 - configure: Move nm search logic to new file
b7898f93 - configure: Add check for whether CC supports --target
09eff30f - ci: Add version to cache key

Compare with previous version

added 4 commits

acccf319 - ci: More surgical use of nix in Darwin builds
f0cc7658 - configure: Move nm search logic to new file
5123d51f - configure: Add check for whether CC supports --target
bcda7110 - ci: Add version to cache key

Compare with previous version

I think the toolchain needs a system flag, and then needs to be prameterized over the system. We can't assume that people on regular intel macs can run arm64 binaries, which the toolchain defaults to. Nor can we rule out there are bugs that result from building x86_64 software with an arm toolchain. I still believe we should cleanly separate both environments. We are effectively pretending to be on an intel-mac building intel-mac software to cover for the x86_64-darwin case. And the same for aarch64-darwin case, however as it is now, we assume we are always on an aarch64-darwin machine.

I don't argue that being explicit about the target is a good thing, but this is lacking the "native" element in our CI setup.

Done.

added 4 commits

7f5d7ee8 - ci: More surgical use of nix in Darwin builds
d1611635 - configure: Move nm search logic to new file
9e7c8f9b - configure: Add check for whether CC supports --target
219af807 - ci: Add version to cache key

Compare with previous version

added 4 commits

9ea0ed3a - ci: More surgical use of nix in Darwin builds
4fadf398 - configure: Move nm search logic to new file
b4c73284 - configure: Add check for whether CC supports --target
a065d271 - ci: Add version to cache key

Compare with previous version

I think I'll hold off on merging this until %8.10.6 is out since it's currently suffering from #19950 (closed).

added 61 commits

a065d271...10678945 - 52 commits from branch master
777adf96 - ci: Drop redundant `cabal update`s
45d59a08 - ci: Consolidate handling of cabal cache
da94951d - ci: Isolate build from HOME
e63c3b6a - ci: Move phase timing logic into ci.sh
2e265a10 - ci: More surgical use of nix in Darwin builds
f2f611b1 - configure: Move nm search logic to new file
bd7b8bbc - configure: Add check for whether CC supports --target
e0a5847e - ci: Add version to cache key
8aa40ff6 - DEBUG

Compare with previous version

mentioned in merge request !5737 (closed)

aarch64 build currently fails with

error: Package ‘ghc-8.10.4’ in /nix/store/9ry8c3r3213rqrbm4j8vdh66mwj02i6r-nixpkgs-src/pkgs/development/compilers/ghc/8.10.4.nix:267 is not supported on ‘aarch64-darwin’, refusing to evaluate.
a) To temporarily allow packages that are unsupported for this system, you can use an environment variable
   for a single invocation of the nix tools.
     $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1
b) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnsupportedSystem = true; }
in configuration.nix to override this.
c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnsupportedSystem = true; }
to ~/.config/nixpkgs/config.nix.
(use '--show-trace' to show detailed location information)