Hi @jiamo

So far the build system can be used to compile any version of python from 2.7.3 to 2.7.14, and also 3.5.1 to 3.5.2.

These are the version whose checksum are explicitly listed in the top-level CMakeLists.txt

It also possible to pass -DSRC_DIR:PATH=/path/to/Python-3.8 source and the build system will do its best to build it (not tested yet)

All of that said, it may be good to have to branch 2.x and 3.x, that way we would simplify the build system overall.

xref #214

Following both the retirement of the 2.7.x support and the update of the minimum CMake required version, the build-system was simplified to leverage generator expressions. This should simplify the overall maintenance by helping understand which CPython versions are associated with which CMake commands.

Related pull requests:

• cmake: Simplify logic using generator expressions #369
• cmake: Update minimum required version from 3.15.6 to 3.20.6 #362
• Simplify build-system removing support for building CPython 2.7 #352