in setup.py [0:0]
def build_extension(self, ext: CMakeExtension) -> None:
# Must be in this form due to bug in .resolve() only fixed in Python 3.10+
ext_fullpath = Path.cwd() / self.get_ext_fullpath(ext.name)
extdir = ext_fullpath.parent.resolve()
# Using this requires trailing slash for auto-detection & inclusion of
# auxiliary "native" libs
debug = int(os.environ.get("DEBUG",
0)) if self.debug is None else self.debug
cfg = "Debug" if debug else "Release"
# CMake lets you override the generator - we need to check this.
# Can be set with Conda-Build, for example.
cmake_generator = os.environ.get("CMAKE_GENERATOR", "")
# Set Python_EXECUTABLE instead if you use PYBIND11_FINDPYTHON
# EXAMPLE_VERSION_INFO shows you how to pass a value into the C++ code
# from Python.
cmake_args = [
f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}{os.sep}",
f"-DPYTHON_EXECUTABLE={sys.executable}",
f"-DCMAKE_BUILD_TYPE={cfg}", # not used on MSVC, but no harm
f"-DTORCH_CMAKE_PREFIX_PATH={torch.utils.cmake_prefix_path}",
]
build_args = []
minimal_build_env = os.environ.get("ARCTIC_MINIMAL_BUILD",
"").lower() in ("1", "true", "on")
if minimal_build_env and torch.cuda.is_available():
major, minor = torch.cuda.get_device_capability()
arch_string = f"{major}.{minor}"
cmake_args.append(f"-DTORCH_CUDA_ARCH_LIST={arch_string}")
# Adding CMake arguments set as environment variable
# (needed e.g. to build for ARM OSx on conda-forge)
if "CMAKE_ARGS" in os.environ:
cmake_args += [
item for item in os.environ["CMAKE_ARGS"].split(" ") if item
]
# In this example, we pass in the version to C++. You might not need to.
cmake_args += [
f"-DEXAMPLE_VERSION_INFO={self.distribution.get_version()}"
]
if self.compiler.compiler_type != "msvc":
# Using Ninja-build since it a) is available as a wheel and b)
# multithreads automatically. MSVC would require all variables be
# exported for Ninja to pick it up, which is a little tricky to do.
# Users can override the generator with CMAKE_GENERATOR in CMake
# 3.15+.
if not cmake_generator or cmake_generator == "Ninja":
try:
import ninja
ninja_executable_path = Path(ninja.BIN_DIR) / "ninja"
cmake_args += [
"-GNinja",
f"-DCMAKE_MAKE_PROGRAM:FILEPATH={ninja_executable_path}",
]
except ImportError:
pass
else:
# Single config generators are handled "normally"
single_config = any(x in cmake_generator
for x in {"NMake", "Ninja"})
# CMake allows an arch-in-generator style for backward compatibility
contains_arch = any(x in cmake_generator for x in {"ARM", "Win64"})
# Specify the arch if using MSVC generator, but only if it doesn't
# contain a backward-compatibility arch spec already in the
# generator name.
if not single_config and not contains_arch:
cmake_args += ["-A", PLAT_TO_CMAKE[self.plat_name]]
# Multi-config generators have a different way to specify configs
if not single_config:
cmake_args += [
f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{cfg.upper()}={extdir}"
]
build_args += ["--config", cfg]
if sys.platform.startswith("darwin"):
# Cross-compile support for macOS - respect ARCHFLAGS if set
archs = re.findall(r"-arch (\S+)", os.environ.get("ARCHFLAGS", ""))
if archs:
cmake_args += [
"-DCMAKE_OSX_ARCHITECTURES={}".format(";".join(archs))
]
# Set CMAKE_BUILD_PARALLEL_LEVEL to control the parallel build level
# across all generators.
if "CMAKE_BUILD_PARALLEL_LEVEL" not in os.environ:
# self.parallel is a Python 3 only way to set parallel jobs by hand
# using -j in the build_ext call, not supported by pip or PyPA-build.
if hasattr(self, "parallel") and self.parallel:
# CMake 3.12+ only.
build_args += [f"-j{self.parallel}"]
build_temp = Path(self.build_temp) / ext.name
if not build_temp.exists():
build_temp.mkdir(parents=True)
subprocess.run(["cmake", ext.sourcedir, *cmake_args],
cwd=build_temp,
check=True)
subprocess.run(["cmake", "--build", ".", *build_args],
cwd=build_temp,
check=True)