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GeezerVison is showing github.com — gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME by serhiy-storchaka · Pull Request #159886 · python/cpython

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serhiy-storchaka commented Oct 20, 2026 •

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Match on the host triplet instead of the unset $ac_cv_libc. configure regenerated with autoconf 2.72.

Verified: glibc x86_64 unchanged (check runs, macro defined), musl x86_64 unchanged (skipped), musl i686 now builds without ac_cv_have_decl_PR_SET_VMA_ANON_NAME=no.

Matching the triplet rather than __GLIBC__ keeps the check enabled on Android/bionic, where the headers do not clash.

🤖 Generated with Claude Code

Issue: configure: the musl guard for PR_SET_VMA_ANON_NAME tests an unset variable #159885

Issue: failure building Python 3.15.0a3 through 3.15.0 release on Alpine #143632

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serhiy-storchaka requested review from AA-Turner, corona10, emmatyping, erlend-aasland and itamaro as code owners

October 20, 2026 15:03

bedevere-app Bot mentioned this pull request

Oct 20, 2026

configure: the musl guard for PR_SET_VMA_ANON_NAME tests an unset variable #159885

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Oct 20, 2026


          pythongh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME

dd58805

The guard added by pythongh-143730 tested $ac_cv_libc, which is never set, so the
check always ran and the build could fail on the struct prctl_mm_map
redefinition it was meant to avoid.  Match on the host triplet instead.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

serhiy-storchaka force-pushed the gh-159885-musl-prctl branch from 4284433 to dd58805 Compare

October 20, 2026 15:53

serhiy-storchaka changed the title ~~gh-159885: Fix the musl check for PR_SET_VMA_ANON_NAME~~ gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME

Oct 20, 2026

bedevere-app Bot mentioned this pull request

Oct 20, 2026

failure building Python 3.15.0a3 through 3.15.0 release on Alpine #143632

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corona10 approved these changes

Oct 20, 2026

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lgtm!

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bedevere-app Bot added awaiting merge and removed awaiting core review labels

Oct 20, 2026

serhiy-storchaka merged commit f37e821 into python:main

Oct 20, 2026

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bedevere-app Bot removed the awaiting merge label

Oct 20, 2026

serhiy-storchaka deleted the gh-159885-musl-prctl branch

October 20, 2026 17:29

serhiy-storchaka added needs backport to 3.14

bugs and security fixes

needs backport to 3.15 bugs and security fixes labels

Oct 20, 2026

miss-islington-app Bot commented Oct 20, 2026

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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖

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miss-islington-app Bot commented Oct 20, 2026

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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

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miss-islington-app Bot commented Oct 20, 2026

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Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.14 due to a conflict.

Please backport manually with cherry_picker, see the devguide for more information.

cherry_picker f37e82139a24c4f1bd84c7d9111f44719b94fff5 3.14

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bedevere-app Bot commented Oct 20, 2026

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GH-159919 is a backport of this pull request to the 3.15 branch.

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miss-islington-app Bot assigned serhiy-storchaka

Oct 20, 2026

bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label

Oct 20, 2026

serhiy-storchaka removed the needs backport to 3.14 bugs and security fixes label

Oct 20, 2026

serhiy-storchaka added a commit that referenced this pull request

Oct 20, 2026


          [3.15] gh-143632: Fix the musl check for PR_SET_VMA_ANON_NAME (GH-159886

eb9ec94

) (GH-159919)

The guard added by gh-143730 tested $ac_cv_libc, which is never set, so the
check always ran and the build could fail on the struct prctl_mm_map
redefinition it was meant to avoid.  Match on the host triplet instead.
(cherry picked from commit f37e821)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Opus 5 (1M context) <[email protected]>

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corona10

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serhiy-storchaka commented Oct 20, 2026 •

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