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Commitef9443d

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fix: add CMake as a build requirement only if required
The PyPI distribution of CMake shall not be listed as an unconditional build requirement.It shall only be added as a build requirement if not installed or too low a version.This helps building from sources on platforms where no wheels are available for CMake but the system already provides a recent enough CMake version.In case of error checking the version, the backend falls back to using the PyPI distribution of CMake.
1 parent43c1105 commitef9443d

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3 files changed

+29
-1
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3 files changed

+29
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‎MANIFEST.in

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@@ -4,6 +4,7 @@ include README.md
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include find_version.py
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include setup.py
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include pyproject.toml
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include _build_backend/backend.py
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recursive-include cv2 *
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recursive-include docker *
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recursive-include opencv *

‎_build_backend/backend.py

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@@ -0,0 +1,23 @@
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fromsetuptoolsimportbuild_metaas_orig
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prepare_metadata_for_build_wheel=_orig.prepare_metadata_for_build_wheel
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build_wheel=_orig.build_wheel
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build_sdist=_orig.build_sdist
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get_requires_for_build_sdist=_orig.get_requires_for_build_sdist
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defget_requires_for_build_wheel(config_settings=None):
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frompackagingimportversion
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fromskbuild.exceptionsimportSKBuildError
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fromskbuild.cmakerimportget_cmake_version
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packages=_orig.get_requires_for_build_wheel(config_settings)
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# check if system cmake can be used if present
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# if not, append cmake PyPI distribution to required packages
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# scikit-build>=0.18 itself requires cmake 3.5+
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min_version="3.5"
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try:
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ifversion.parse(get_cmake_version().split("-")[0])<version.parse(min_version):
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packages.append(f'cmake>={min_version}')
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exceptSKBuildError:
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packages.append(f'cmake>={min_version}')
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returnpackages

‎pyproject.toml

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@@ -1,13 +1,17 @@
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[build-system]
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requires = [
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"cmake>=3.1",
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"numpy==1.13.3; python_version=='3.6' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
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"numpy==1.17.0; python_version=='3.7' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
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"numpy==1.17.5; python_version=='3.8' and platform_machine != 'aarch64' and platform_machine != 'arm64'",
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"numpy==1.19.3; python_version<'3.9' and sys_platform == 'linux' and platform_machine == 'aarch64'",
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"numpy==1.21.0; python_version<'3.9' and sys_platform == 'darwin' and platform_machine == 'arm64'",
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"numpy>=2.0.0; python_version>='3.9'",
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"packaging",
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"pip",
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"scikit-build>=0.14.0",
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"setuptools==59.2.0",
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]
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# use a custom backend to manage CMake check / installation
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# see https://scikit-build.readthedocs.io/en/latest/usage.html#adding-cmake-as-building-requirement-only-if-not-installed-or-too-low-a-version
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build-backend ="backend"
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backend-path = ["_build_backend"]

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