The C libraries that get compiled statically and linked into CPython, so that the corresponding standard-library modules work in a portable build.
- External modules reference - The full table: default versions, telltales, and Linux build constraints.
Each module is a ModuleBuilder subclass. The set of candidates CPython can link is declared in Cpython.candidate_modules(); which ones are actually built depends on config, the --modules flag, telltale detection, and auto-selection.