astral-sh/python-build-standalone 20260718

on GitHub

Updates

• CPython 3.15.0b3 -> 3.15.0b4

Distribution changes

• Linux distributions are built with performance conscious hardening flags.
• Modern kernel UAPI header are used when building for Linux. Functionality that depends on the kernel version at build time, such as os.pidfd_open, is now available. If the runtime kernel does not support the syscall, OSError will be raised.
• On Linux, os.memfd_create is available when supported by the runtime glibc version.

Build system changes

• The BOLT behavior is now configured through environment variables rather than by patching CPython.

Full Changelog: 2026062...2026071