Question: Is There a Way to Enable Extras in `tool.scikit-build.overrides`?

[ahnaf-tahmid-chowdhury]

Context

I am working on a project where I want to enable conditional features, specifically MPI support, using Python extras during installation:

pip install .[mpi]

I have defined optional dependencies in my pyproject.toml like this:

[project.optional-dependencies]
mpi = ["mpi4py"]

I want to conditionally enable MPI in the build configuration, and I tried using the [[tool.scikit-build.overrides]] section to detect when the mpi extra is used:

[[tool.scikit-build.overrides]]
if = "extra == 'mpi'"
cmake.define.ENABLE_MPI = "ON"

However, this results in an error:

"extra == 'mpi'" is not valid under any of the given schemas.

Question

Is there currently a way to conditionally apply overrides based on extras (e.g., extra == 'mpi') within the tool.scikit-build.overrides section?

Suggestion (If Not Currently Supported)

If this feature is not currently supported, would it be possible to introduce support for matching extras within the overrides section? This would make it easier to enable specific build configurations based on user-specified extras, aligning with Python’s optional-dependencies mechanism.

Thank you for your time and assistance!

Environment Details

• scikit-build-core version: 0.10.7
• Python version: 3.12
• Platform: Linux