Feature or enhancement

Context:

• PEP 703 (Build Configuration Changes)
• PEP 3149 – ABI version tagged .so files

The--disable-gil builds will have a differentversion specific ABI from the default CPython 3.13 builds due to reference counting differences and other changes. This should be indicated by a "t" (for "threading") in the ABI tag.

On POSIX, this is achieved by setting theABIFLAGS variable, which feeds into the sysconfigEXT_SUFFIX andSOABI variables. The version specific shared libraries would look like:

• package.cpython-313t-darwin.so

On Windows, this is achieved by settingPYD_TAGGED_SUFFIX, which feeds into the sysconfigEXT_SUFFIX. The shared libraries using the version specific ABI would look like:

• _package.cp313t-win_amd64.pyd

Note that this does not address and is independent of the stable ABI. There's ongoingdiscussion about how best to support the stable ABI in--disable-gil builds.

cc@gpshead@brettcannon@vstinner

Linked PRs

• gh-109740: Use 't' in--disable-gil SOABI #109922