Page Comparison

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4.1. Built-in lib in Python interpreter

• Described https://linaro.atlassian.net/wiki/spaces/WOA/pages/28593914166/setuptools-distutils#3.1.-Built-in-lib-in-Python-interpreter

• As this is going to be deprecated, I won’t expect any further support.

• Short summary

  • On WoA machine, the cross-compile MSVC is called by default, but on x64 it can’t be enforced.

• win-arm64 has been added as a host platform (in 2019)

  • This means on win-arm64 platform without any env var setting, it will invoke x86/arm64 MSVC compiler by default.

    • Whis Which is good on WoA

  • https://github.com/python/cpython/blob/v3.10.0rc1/Lib/distutils/util.py#L39

    Code Block
    def get_host_platform(): if os.name == 'nt': if 'amd64' in sys.version.lower(): return 'win-amd64' if '(arm)' in sys.version.lower(): return 'win-arm32' if '(arm64)' in sys.version.lower(): return 'win-arm64' return sys.platform

  • https://github.com/python/cpython/blob/v3.10.0rc1/Lib/distutils/_msvccompiler.py#L163

    Code Block
    PLAT_TO_VCVARS = { 'win32' : 'x86', 'win-amd64' : 'x86_amd64', 'win-arm32' : 'x86_arm', 'win-arm64' : 'x86_arm64' }

• win-arm64 is not added as a target platform

  • it means win-arm64 as build target can’t be enforced by VSCMD_ARG_TGT_ARCH=arm64 environment variable on x64

  • as this is going to be deprecated and not recommended to use for any projects it’s not a blocker, but any project that is tied to old distutils, can’t be cross-compiled from x64 to win-arm64, for example numpy!

    • see https://linaro.atlassian.net/wiki/spaces/WOA/pages/28593914166/setuptools-distutils#2.-Important-issues

  • https://github.com/python/cpython/blob/v3.10.0rc1/Lib/distutils/util.py#L99

    Code Block
    def get_platform(): if os.name == 'nt': TARGET_TO_PLAT = { 'x86' : 'win32', 'x64' : 'win-amd64', 'arm' : 'win-arm32', } return TARGET_TO_PLAT.get(os.environ.get('VSCMD_ARG_TGT_ARCH')) or get_host_platform() else: return get_host_platform()

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4.2. Within stand-alone setuptools package

• Described https://linaro.atlassian.net/wiki/spaces/WOA/pages/28593914166/setuptools-distutils#3.2.-Within-stand-alone-setuptools-package

• As this deprecates the internal lib of CPython, any further support should be added and expected here.

• Short summary

  • On WoA machine, the cross-compile MSVC is called by default, while on x64 it can be enforced by VSCMD_ARG_TGT_ARCH=arm64 env var.

• win-arm64 is supported as host platform

  • https://github.com/pypa/setuptools/blob/main/setuptools/_distutils/util.py#L40

    Code Block
    def get_host_platform(): if os.name == 'nt': if 'amd64' in sys.version.lower(): return 'win-amd64' if '(arm)' in sys.version.lower(): return 'win-arm32' if '(arm64)' in sys.version.lower(): return 'win-arm64' return sys.platform

  • https://github.com/pypa/setuptools/blob/main/setuptools/_distutils/_msvccompiler.py#L92

    Code Block
    PLAT_TO_VCVARS = { 'win32' : 'x86', 'win-amd64' : 'x86_amd64', 'win-arm32' : 'x86_arm', 'win-arm64' : 'x86_arm64' }

• win-arm64 is supported as a target platform as well

  • https://github.com/pypa/setuptools/blob/0c302d232dd1a1f4ec531050532a84274edac2f4/setuptools/_distutils/util.py#L100

    Code Block
    def get_platform(): if os.name == 'nt': TARGET_TO_PLAT = { 'x86' : 'win32', 'x64' : 'win-amd64', 'arm' : 'win-arm32', 'arm64': 'win-arm64', } return TARGET_TO_PLAT.get(os.environ.get('VSCMD_ARG_TGT_ARCH')) or get_host_platform() else: return get_host_platform()

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