Discover CMake packages installed by wheels

[bdice]

Adds rapids_cython_find_prefix_paths() so direct CMake builds in pip environments can discover packages provided by installed wheels.

Part of rapidsai/build-planning#325.

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[bdice]

I guess this might not be needed if nvForest eliminates its dependencies on other RAPIDS libraries. @chyunsu3 Is #193 still targeting 26.10?

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📥 Commits

Reviewing files that changed from the base of the PR and between edc29fb and 7b46a72.

📒 Files selected for processing (2)

• python/libnvforest/CMakeLists.txt
• python/nvforest/CMakeLists.txt

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Improved package discovery during installation and builds when Python is available.
  • Added support for locating libraries installed in standard 64-bit library directories.
  • Improved detection of Python-installed packages and libraries, including those installed through package wheels.
  • Reduced configuration issues when building across supported environments with libraries installed in common site-packages or 64-bit locations.

Walkthrough

CMake now detects the installed Python interpreter and uses Cython wheel prefixes for package discovery. CMake also enables lib64 library-path searches for RAPIDS wheel libraries.

Changes

Python package discovery

Layer / File(s)	Summary
CMake Python path integration cpp/CMakeLists.txt	When Python_FOUND is true, CMake collects Cython-derived wheel prefixes, enables FIND_LIBRARY_USE_LIB64_PATHS, and prepends the prefixes to CMAKE_PREFIX_PATH.
RAPIDS wheel library search python/libnvforest/CMakeLists.txt, python/nvforest/CMakeLists.txt	The Python build configurations enable lib64 library-path searches for C++ libraries installed in RAPIDS wheels.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 7b46a

CMake can now locate RAPIDS dependencies installed from Python wheels, including libraries in adjacent lib64 directories. The change is ready to merge with no identified current-head risk.

Suggested reviewers: chyunsu3

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description accurately states that the pull request adds rapids_cython_find_prefix_paths() to discover packages from installed wheels during direct CMake builds.
Title check	✅ Passed	The title clearly summarizes the main change: enabling CMake to discover packages installed by wheels.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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