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GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter #146391

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Merged
hugovk merged 8 commits into from
Mar 27, 2026
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GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter #146391

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682055e
update 3.15 whatsnew: Windows 64-bit binaries
chris-eibl Mar 24, 2026
22277d9
ref link the new tail-calling interpreter
chris-eibl Mar 24, 2026
66ad26d
use issue instead of PR
chris-eibl Mar 24, 2026
f1415a7
Update Doc/whatsnew/3.15.rst
chris-eibl Mar 25, 2026
84fb115
Update Doc/whatsnew/3.15.rst
chris-eibl Mar 25, 2026
b3c2f08
add to release highlights
chris-eibl Mar 26, 2026
ebe2ad9
Merge the two news entries
chris-eibl Mar 26, 2026
cc4302d
add Steve again. yes yes yes!
chris-eibl Mar 26, 2026
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9 changes: 9 additions & 0 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -1943,6 +1943,15 @@ Build changes
and :option:`-X dev <-X>` is passed to the Python or Python is built in :ref:`debug mode <debug-build>`.
(Contributed by Donghee Na in :gh:`141770`.)

* The official Windows 64-bit binaries on python.org__ are now using the new
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:ref:`tail-calling interpreter <whatsnew314-tail-call-interpreter>` since Python 3.15.0a8.
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(Contributed by Ken Jin, Brandt Bucher and Chris Eibl in :gh:`143068`.
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@Fidget-Spinner Fidget-Spinner Mar 24, 2026 •
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I think technically you contributed this build change and not me nor the rest of us though?

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@chris-eibl chris-eibl Mar 24, 2026

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Yupp, I've done python/release-tools#346 with @zooba's help. Don't think we can / do link to release-tools here?

Thus, I've re-used the wording of #143068 blurb.

Maybe just link to https://docs.python.org/3.15/whatsnew/3.15.html#optimizations?

Special thanks go to Steve Dower for his assistance with the integration in the
Windows release build process and to the MSVC team including Hulon Jenkins
for ``msvc::musttail``.)

__ https://www.python.org/downloads/windows/


Porting to Python 3.15
======================
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