[BUG]: Editable builds of cuda_cccl and cuda_parallel broke after merge of pull/3597

[oleksandr-pavlyk]

Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this bug and that I agree to the Code of Conduct

Type of Bug

Silent Failure

Component

cuda.parallel (Python)

Describe the bug

gh-3597 switched build systems from setuptools to scikit-build-core.

They differ in their methods of producing editable installs. Setuptools places install artifacts into the source tree, while scikit-build-core uses redirect method and does not pollute the source tree, but places artifacts into site-packages.

The logic in cuda_cccl and in cuda_parallel to find header files by cuda_cccl or the shared library by cuda_parallel assumed that artifacts were installed in the source tree.

With the merge if gh-3597 that changed and editable installs stopped working correctly,

How to Reproduce

Install cuda-parallel using editable install CXX=g++ CUDACXX=/usr/local/cuda/bin/nvcc CUDAARCHS=86 pip install -e . and run tests pytest -sv --maxfail=1 tests

Expected behavior

Editable install should work as before.

Reproduction link

No response

Operating System

No response

nvidia-smi output

-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 570.86.10              Driver Version: 570.86.10      CUDA Version: 12.8     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA RTX A400                Off |   00000000:01:00.0  On |                  N/A |
| 30%   35C    P5             N/A /   50W |    2075MiB /   4094MiB |     28%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+
                                                                                         

NVCC version

(build-py312) opavlyk@ee09c48-lcedt:~/repos/cccl/python/cuda_parallel$ /usr/local/cuda/bin/nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2025 NVIDIA Corporation
Built on Wed_Jan_15_19:20:09_PST_2025
Cuda compilation tools, release 12.8, V12.8.61
Build cuda_12.8.r12.8/compiler.35404655_0

(build-py312) opavlyk@ee09c48-lcedt:~/repos/cccl/python/cuda_parallel$ python --version
Python 3.12.8