We should use a different $(IntDir) and $(OutDir) for free threaded builds so that it's faster to switch between them and so they can be built in parallel.

The output filename should be python{major}.{minor}t.exe and python{major}{minor}t.dll. Debug builds are python{major}.{minor}t_d.exe and python{major}{minor}t_d.dll.

The ABI tag becomes .cp{major}{minor}t-{plat}

All stdlib .pyd files get an ABI tag.

The python.bat is updated as normal (overwriting the last yesgil build).

The installer should not include a python.exe, to avoid causing PATH conflicts, but Nuget, embeddable and Store packages should include a copy/alias.

PEP 514 registration (a.k.a. sys.winver) should use {major}.{minor}t-{plat}.

Tests that rely on the executable name should use sys.executable wherever possible, and hopefully there's a support variable already for the rest.

All of these only take effect when $(DisableGil) == 'true' (which is set by build.bat --disable-gil, but the build variable is canonical).

Linked PRs

• gh-112984 Update Windows build for free-threaded builds #113129
• gh-112984: Fix test_ctypes.test_loading.test_load_dll_with_flags when directory name includes a dot #114217
• gh-112984: Fix link error on free-threaded Windows build #114455