When building the project using setup.py, it would pollute the source directory with a lot of virtual environment build directories. Move all of those into a common 'build' subdirectory. This eases cleanup of all build directories because they can all be removed with a single rm command. It also places all the various stages of build -> install -> package folders into a common subdirectory so it's easier to find and navigate between them. If no virtualenv is detected, change the venv prefix from the previous value of 'pyside' to 'qfp' and include the build classifiers. If a virtualenv is detected, we consider it is distinct enough and don't include the build classifiers, apart from a few chars to denote a debug python, debug Qt or limited api build. Example of the new build directory structure when a virtualenv is detected build/{venv_name}/build/shiboken6 build/{venv_name}/build/pyside6 build/{venv_name}/install/bin/shiboken6 build/{venv_name}/package Example of the new build directory structure when a virtualenv is NOT detected build/qfp-py3.9-qt6.2.0-64bit-release/build/shiboken6 build/qfp-py3.9-qt6.2.0-64bit-release/build/pyside6 build/qfp-py3.9-qt6.2.0-64bit-release/install/bin/shiboken6 build/qfp-py3.9-qt6.2.0-64bit-release/package Move the code that always removed the ./build directory on each setup.py invocation into prepare_packages() instead. This way it only removes the files from the 'package' subfolder which is the common packaging location between all the sub-projects. This removal is needed to ensure shiboken files don't end up packaged in the PySide6 wheel. This relands commit 234349d124ccfa399921e2b9fc09addcff0b0a94 This reverts commit 0c6eb7cd232fff9d81a8d5bc9a7fd71d9b8c67f5 [ChangeLog][setup.py] Build directories are now created inside the root ./build directory, rather than directly under the root of the project. Pick-to: 6.2 Change-Id: I6d511ae77cb66c2c5a872d6b85ff33e1831b803e Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>