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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: Pybind11 transition plan","articleBody":"We intend to switch the C/C++ extension build system to use `pybind11` as discussed in this week's call. There is a demonstration in PR #23787 showing that the approach works and listing the pros and cons. It is too much work to do in a single PR so will probably be done one extension at a time. This issue is intended to track the overall progress by editing this post to tick the relevant check box and add the PR number for each extension completed.\r\n\r\nC/C++ extensions:\r\n  - [x] `agg` (start in #27011)\r\n  - [x] `c_internal_utils` (PR in #26794)\r\n  - [x] `ft2font` (PR in #28785)\r\n  - [x] `image` (implemented in #26275)\r\n  - [x] `path`  #27087\r\n  - [x] `qhull`(PR in #27184)\r\n  - [x] `tkagg` (PR in #26992)\r\n  - [x] `tri` (implemented in #24522)\r\n  - [x] `ttconv` (implemented in #25253)\r\n  - [x] ~~`macosx` (developer needs access to macOS)~~\r\n\r\nOther work required:\r\n  - [x] Update to use PEP517/518-complicant build system. Not strictly required but makes the build process simpler so ideally would be done before merging any specific extension PRs. Work on this has started in #23829; for `pybind11` we only really need the `[build-system]` section of `pyproject.toml` which was added in #24102.\r\n  - [x] Remove unneeded wrapper code in `src` directory such as the `array_view` class when all extensions completed. #28857\r\n  - [x] Remove `numpy` as a build-time dependency when all extensions completed as `pybind11` does not require it. #28857\r\n","author":{"url":"https://github.com/ianthomas23","@type":"Person","name":"ianthomas23"},"datePublished":"2022-09-09T10:25:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/23846/matplotlib/issues/23846"}