cctag: use boost186 to fix build error

[hesiod]

cctag is incompatible with Boost 1.89 at the moment due to the dropped Boost.System find_package component and boost::system meta library.
Also includes some random cleanups (finalAttrs pattern, use of lib.cmakeBool).

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

[hesiod]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 496871
Commit: a59b64c25450e34c4def58dedf9f19f76b6831a9 (subsequent changes)
Merge: 571371381397e50ab882360a8408c39d31656a4a

Logs: https://github.com/hesiod/nixpkgs-review-gha/actions/runs/22717509893

---

x86_64-linux

✅ 2 packages built:

• cctag
• cctag.dev

---

aarch64-linux

✅ 2 packages built:

• cctag
• cctag.dev

---

x86_64-darwin (sandbox = relaxed)

✅ 2 packages built:

• cctag
• cctag.dev

---

aarch64-darwin (sandbox = relaxed)

✅ 2 packages built:

• cctag
• cctag.dev

[hesiod]

Just removed a stray comment in the last push, the derivation is identical to the one reviewed using nixpkgs-review.

[Aleksanaa]

Suggested change

	(lib.cmakeBool "CCTAG_BUILD_TESTS" finalAttrs.doCheck)
	(lib.cmakeBool "CCTAG_BUILD_TESTS" finalAttrs.finalPackage.doCheck)

[hesiod]

Thanks, I applied this - I've seen this pattern in lots of places but haven't found any rationale so far. Would you mind explaining why this is the preferred version?

[Aleksanaa]

finalAttrs is for attributes of the builder, but finalPackage is for the final applied attributes of the derivation. In this case doCheck can be overriden by lower mkDerivation function in cross compilation: https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/make-derivation.nix#L385