[Experiment] Add PreprocessedExtension
#4086
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PreprocessedExtension
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This adds the ability to augment/modify the `sources` list (by creating temporary preprocessed files) just in time for `build_ext.build_extension`. Useful when transpiling other languages to C.
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Summary of changes
This is an experiment.
Currently, "transpilers" that want to plug into
setuptoolsmust either a) overridebuild_extor b) pre-compile files to C at every invocation ofsetup.py.mypycifyis an example of the approach in(b)and suffers from performance issues.My idea with this experiment is to enable deferring the "pre-processing" step just before the compilation when creating the wheel, without requiring a new custom build step or overriding
build_ext.Closes
Pull Request Checklist
newsfragments/.(See documentation for details)