The 'stdlib compileall' function writes stage directory into *.pyc files

Description

I need to install a python package into a stage directory.

The command I run from the source directory is:

pip install {my-pkg-name} --isolated --root=/tmp/stage/dir --prefix=/usr/local --ignore-installed --no-deps

This command installs the package into the right location, but *.cpython-39.pyc files have full paths to *.py files in the stage directory.

If paths of *.py are needed they should be adjusted so that they should begin with prefix (/usr/local). This is because the source directory will be deleted before the package is run.

Pip uses cpython's stdlib compileall function that inserts stage directory paths.

See the original but report for pip: https://github.com/pypa/pip/issues/11317

pip-22.1.2
Python-3.9
FreeBSD 13.1

How to Reproduce

git clone https://github.com/openqasm/openqasm-pygments.git
cd openqasm-pygments
pip install openqasm-pygments --isolated --root=/tmp/openqasm-pygments --prefix=/usr/local --ignore-installed --no-deps

首先使用 openqasm-pygments 包、--root=/tmp/openqasm-pygments 和 --prefix=/usr/local 重现 pip 安装，然后检查 Python 的 stdlib compileall 行为。验证生成的 .cpython-39.pyc 文件将源路径记录在何处；当已安装字节码的路径不再包含 staging 目录，而是以安装前缀开头时，即表示完成。