fix(uv): preserve compiler commands through native wheel builds

[jbedard]

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Use native bazel c toolchains for CC and CXX

Test plan

• Covered by existing test cases
• New test cases added

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[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Thu Jun 25 20:04:42 UTC 2026

❌ 2 failed tasks

• ❌ test-e2e-bazel-8 [test] · ⏱ 2m 47s · 🐙 GitHub Actions · ☑️ Check
  💬 failed in test · Bazel test failed (1 test failed)
• ❌ test-e2e-bazel-9 [test] · ⏱ 3m 20s · 🐙 GitHub Actions · ☑️ Check
  💬 failed in test · Bazel test failed (1 test failed)

✅ 12 successful tasks

• ✅ buildifier · ⏱ 51.8s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle · ⏱ 33.6s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ test-examples-debugger-bazel-8 [test] · ⏱ 34.3s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-debugger-bazel-9 [test] · ⏱ 1m 42s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-dev_deps-bazel-8 [test] · ⏱ 32.4s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-dev_deps-bazel-9 [test] · ⏱ 46.5s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-protobuf-bazel-8 [test] · ⏱ 1m 49s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-protobuf-bazel-9 [test] · ⏱ 1m 38s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-uv_pip_compile-bazel-8 [test] · ⏱ 29.3s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-examples-uv_pip_compile-bazel-9 [test] · ⏱ 1m 26s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed)
• ✅ test-root-bazel-8 [test] · ⏱ 3m 10s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (219/219 passed)
• ✅ test-root-bazel-9 [test] · ⏱ 3m 40s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (218/218 passed)

❌ Test Failures

❌ _diff_test //:snapshots_17_test failed in 110ms:

diff: files "external/aspect_rules_py++uv+sdist_build__uv_sdist_native_build__python_geohash__0_8_5/BUILD.bazel" and "snapshots/sdist_build.uv_sdist_native_build.python_geohash.BUILD.bazel" differ. 

@@//:snapshots/sdist_build.uv_sdist_native_build.python_geohash.BUILD.bazel is out of date. To update this and other generated files, run:

    bazel run @@//:snapshots

To update *only* this file, run:

    bazel run //:snapshots_17




_{in tasks test-e2e-bazel-8, test-e2e-bazel-9}

Reproduce with:

cd e2e
aspect test -- //:snapshots_17_test

# vanilla bazel
cd e2e
bazel test -- //:snapshots_17_test

🔁 Reproduce

❌ test (test-e2e-bazel-8 · test-e2e-bazel-9)

cd e2e
aspect test -- //:snapshots_17_test

# vanilla bazel
cd e2e
bazel test -- //:snapshots_17_test

_{Install aspect: aspect.build/docs/cli/install}

---

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[tamird]

I do not think CcToolchainInfo exposes a reusable compiler-command
contract for arbitrary PEP 517 backends. Bazel's configured compile and link
actions have Bazel C++ semantics; distutils, Meson, CMake, and other backends
own different driver and linker behavior after changing into the source tree.
Projecting those actions requires the sysroot, token, driver, and path
heuristics this change has accumulated.

#1152 removes that projection. Packages declare build_toolchains and env
explicitly; rules_py forwards their inputs and Make variables, makes only
exact whole-value declared tool paths absolute before chdir, and leaves all
other values opaque.