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GeezerVison is showing github.com — gh-140266: Only pass _PYTHON_HOST_PLATFORM when cross compiling by itamaro · Pull Request #161530 · python/cpython

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@itamaro

@itamaro itamaro commented Nov 7, 2026 •
edited by bedevere-app Bot
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configure only sets _PYTHON_HOST_PLATFORM when cross compiling, but PYTHON_FOR_BUILD exported it whenever --with-build-python was given. A native build with a build Python got _PYTHON_HOST_PLATFORM="", which sysconfig.get_platform() returns unchanged, so build-details.json had "platform": "" and the build directory was named build/lib.-3.X.

This passes the variable only when cross compiling.

Tested on macOS with ./configure --with-build-python=... && make build-details.json: platform is macosx-27.2-arm64 and the build directory is named normally.

Written with assistance from Claude Fable 5.1

  • Issue: build-details.json is incorrect when using ./configure --with-build-python on a non-cross build #140266

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@itamaro
itamaro requested a review from brettcannon November 7, 2026 04:56
@itamaro itamaro added build The build process and cross-build needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Nov 7, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Nov 7, 2026
build-details.json is incorrect when using ./configure --with-build-python on a non-cross build #140266
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@itamaro @zanieb @claude
pythongh-140266: Only pass _PYTHON_HOST_PLATFORM when cross compiling
c7bf53b 
configure sets _PYTHON_HOST_PLATFORM only for cross builds, but passed it
to the build Python for every --with-build-python build. In a native
build it was empty, so sysconfig.get_platform() returned "" and
build-details.json ended up with "platform": "".

Co-authored-by: Zanie Blue <[email protected]>
Co-Authored-By: Claude Fable 5.1 <[email protected]>
@itamaro
itamaro force-pushed the gh-140266-host-platform-cross-only branch from 4321c38 to c7bf53b Compare November 7, 2026 05:03
@itamaro
itamaro marked this pull request as ready for review November 7, 2026 15:58
@itamaro
itamaro requested review from AA-Turner, corona10, emmatyping and erlend-aasland as code owners November 7, 2026 15:58
@bedevere-app bedevere-app Bot added the awaiting core review label Nov 7, 2026
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@brettcannon brettcannon Awaiting requested review from brettcannon
@erlend-aasland erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner
@corona10 corona10 Awaiting requested review from corona10 corona10 is a code owner
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@emmatyping emmatyping Awaiting requested review from emmatyping emmatyping is a code owner

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@itamaro
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