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needs backport to 3.14
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this looks good to me, but makes me think - why not have configure detect tail-call support and enable it automatically for supported toolchains? (when the flag is not specified; if the flag is specified it should win)
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This is the second suggestion at #160713 (comment).
The macOS installer uses tail-calling. This moves the tail-calling CI from a dedicated workflow, into the main workflow. This means we get coverage of tail-calling across ARM and Intel and free-threading.
Computed gotos (the non-tail-call on macOS) is still covered by most of buildbots.
One difference, we're now testing with
--with-pydebugand--fast-ci. The main effect is debug slows it a bit, and resource testing is enabled so more tests are covered, but in practice it doesn't make any difference: the three jobs take ~57m16s before, 52m16s after.We also save some CI time: the macOS job in
.github/workflows/tail-call.ymlonly ran when certain C files changed, but it was still extra work. This is now saved.