Add basic setup.py file for the npcomp-core package.

.gitignore

@@ -9,3 +9,8 @@ install-mlir
 __pycache__
 
 .pytype
+
+
+# Pip artifacts.
+*.egg-info
+*.whl

pyproject.toml

@@ -0,0 +1,12 @@
+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel",
+    "cmake>=3.12",
+    # MLIR build depends.
+    "numpy",
+    # Version 2.7.0 excluded: https://github.com/pybind/pybind11/issues/3136
+    "pybind11>=2.6.0,!=2.7.0",
+    "PyYAML",
+]
+build-backend = "setuptools.build_meta"

setup.py

@@ -0,0 +1,98 @@
+# Build/install the npcomp-core python package.
+# Note that this includes a relatively large build of LLVM (~2400 C++ files)
+# and can take a considerable amount of time, especially with defaults.
+# To install:
+#   pip install . --use-feature=in-tree-build
+# To build a wheel:
+#   pip wheel . --use-feature=in-tree-build
+#
+# It is recommended to build with Ninja and ccache. To do so, set environment
+# variables by prefixing to above invocations:
+#   CMAKE_GENERATOR=Ninja CMAKE_C_COMPILER_LAUNCHER=ccache CMAKE_CXX_COMPILER_LAUNCHER=ccache
+#
+# On CIs, it is often advantageous to re-use/control the CMake build directory.
+# This can be set with the NPCOMP_CMAKE_BUILD_DIR env var.
+import os
+import shutil
+import subprocess
+import sys
+
+from setuptools import find_packages, setup, Extension
+from setuptools.command.build_ext import build_ext
+from setuptools.command.build_py import build_py
+
+
+class CMakeExtension(Extension):
+
+  def __init__(self, name, sourcedir=""):
+    Extension.__init__(self, name, sources=[])
+    self.sourcedir = os.path.abspath(sourcedir)
+
+
+class CMakeBuild(build_py):
+
+  def run(self):
+    target_dir = self.build_lib
+    cmake_build_dir = os.getenv("NPCOMP_CMAKE_BUILD_DIR")
+    if not cmake_build_dir:
+      cmake_build_dir = os.path.join(target_dir, "..", "cmake_build")
+    cmake_install_dir = os.path.join(target_dir, "..", "cmake_install")
+    src_dir = os.path.abspath(os.path.dirname(__file__))
+    cfg = "Release"
+    cmake_args = [
+        "-DCMAKE_INSTALL_PREFIX={}".format(os.path.abspath(cmake_install_dir)),
+        "-DPython3_EXECUTABLE={}".format(sys.executable),
+        "-DNPCOMP_VERSION_INFO={}".format(self.distribution.get_version()),
+        "-DCMAKE_BUILD_TYPE={}".format(cfg),  # not used on MSVC, but no harm
+        "-DLLVM_TARGETS_TO_BUILD=host",
+    ]
+    build_args = []
+    os.makedirs(cmake_build_dir, exist_ok=True)
+    if os.path.exists(cmake_install_dir):
+      shutil.rmtree(cmake_install_dir)
+    cmake_cache_file = os.path.join(cmake_build_dir, "CMakeCache.txt")
+    if os.path.exists(cmake_cache_file):
+      os.remove(cmake_cache_file)
+    subprocess.check_call(["cmake", src_dir] + cmake_args, cwd=cmake_build_dir)
+    subprocess.check_call(["cmake", "--build", ".", "--target", "install"] +
+                          build_args,
+                          cwd=cmake_build_dir)
+    shutil.copytree(os.path.join(cmake_install_dir, "python_packages",
+                                 "npcomp_core"),
+                    target_dir,
+                    symlinks=False,
+                    dirs_exist_ok=True)
+
+
+class NoopBuildExtension(build_ext):
+
+  def build_extension(self, ext):
+    pass
+
+
+setup(
+    name="npcomp-core",
+    version="0.0.1",
+    author="Stella Laurenzo",
+    author_email="stellaraccident@gmail.com",
+    description="NPComp Core",
+    long_description="",
+    ext_modules=[
+        CMakeExtension("mlir._mlir_libs._mlir"),
+        CMakeExtension("mlir._mlir_libs._npcomp"),
+        # TODO: We don't really want these but they are along for the ride.
+        CMakeExtension("mlir._mlir_libs._mlirAsyncPasses"),
+        CMakeExtension("mlir._mlir_libs._mlirConversions"),
+        CMakeExtension("mlir._mlir_libs._mlirTransforms"),
+        CMakeExtension("mlir._mlir_libs._mlirSparseTensorPasses"),
+        CMakeExtension("mlir._mlir_libs._mlirAllPassesRegisration"),
+        CMakeExtension("mlir._mlir_libs._mlirLinalgPasses"),
+        CMakeExtension("mlir._mlir_libs._mlirGPUPasses"),
+    ],
+    cmdclass={
+        "built_ext": NoopBuildExtension,
+        "build_py": CMakeBuild,
+    },
+    zip_safe=False,
+    packages=find_packages(),
+)