Race condition during installation in parallel builds

[jefferyto]

Bug report

When running make -j install, it is possible for the python3 symlink to be installed before all standard library modules are installed. If an external program tries to run Python at this moment it can lead to an execution error.

We are getting sporadic build errors at OpenWrt (openwrt/packages#19241) and believe this to be the cause, that during the build for "host" Python (Python that runs on the buildbot), another package being built tries to run a script using this Python because the python3 symlink is in place.

Your environment

• CPython versions tested on: 3.10
• Operating system and architecture: Linux, not sure exactly which distribution

Linked PRs

• gh-104692: Include commoninstall as a prerequisite for bininstall #104693
• [3.12] gh-104692: Include commoninstall as a prerequisite for bininstall (GH-104693) #105428
• [3.11] gh-104692: Include commoninstall as a prerequisite for bininstall (GH-104693) #105429

[jefferyto]

Fixes have been merged, closing.