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pybind (#161230)" (#162309)
This reverts commit 84a214856ad989f37af19f5e8aaa9ec2346dde6f.
This gives us more time to work out the alternative and also people to
migrate
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(#161230)
Inspired by this comment
https://github.com/llvm/llvm-project/pull/157930#issuecomment-3346634290
(and long-standing issues related to finding nanobind/pybind in the
right place), this PR moves to using `FetchContent_Declare` to get the
nanobind dependency. This is pretty standard (see e.g.,
[IREE](https://github.com/iree-org/iree/blob/cf60359b7443b0e92e15fb6ffc011525dc40e772/CMakeLists.txt#L842-L848)).
This PR also removes pybind which has been deprecated for almost a year
(https://github.com/llvm/llvm-project/pull/117922) and which isn't
compatible (for whatever reason) with `FetchContent_Declare`.
---------
Co-authored-by: Jacques Pienaar <jpienaar@google.com>
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Reverts revert #118517 after (hopefully) fixing builders
(https://github.com/llvm/llvm-zorg/pull/328,
https://github.com/llvm/llvm-zorg/pull/327)
This reverts commit 61bf308cf2fc32452f14861c102ace89f5f36fec.
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Reverts llvm/llvm-project#117922 because deps aren't met on some of the
post-commit build bots.
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This PR allows out-of-tree dialects to write Python dialect modules
using nanobind instead of pybind11.
It may make sense to migrate in-tree dialects and some of the ODS Python
infrastructure to nanobind, but that is a topic for a future change.
This PR makes the following changes:
* adds nanobind to the CMake and Bazel build systems. We also add
robin_map to the Bazel build, which is a dependency of nanobind.
* adds a PYTHON_BINDING_LIBRARY option to various CMake functions, such
as declare_mlir_python_extension, allowing users to select a Python
binding library.
* creates a fork of mlir/include/mlir/Bindings/Python/PybindAdaptors.h
named NanobindAdaptors.h. This plays the same role, using nanobind
instead of pybind11.
* splits CollectDiagnosticsToStringScope out of PybindAdaptors.h and
into a new header mlir/include/mlir/Bindings/Python/Diagnostics.h, since
it is code that is no way related to pybind11 or for that matter,
Python.
* changed the standalone Python extension example to have both pybind11
and nanobind variants.
* changed mlir/python/mlir/dialects/python_test.py to have both pybind11
and nanobind variants.
Notes:
* A slightly unfortunate thing that I needed to do in the CMake
integration was to use FindPython in addition to FindPython3, since
nanobind's CMake integration expects the Python_ names for variables.
Perhaps there's a better way to do this.
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