Description

chris-eibl

opened on Apr 3, 2026

Issue body actions

Rather than failing late when compiling e.g. a debug configuration

build.bat -c debug --tail-call-interp

with hundreds of

error C4737: Unable to perform required tail call. Performance may be degraded.

lets fail early with an explicit error message for configurations that are not supported by MSVC.

This is a follow-up on #140513 / #140548.

Linked PRs

• GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows #148036
• gh-148047: Revert "GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows (#148036)" #148558

Reacted by Maurycy Pawłowski-Wieroński

Activity

1. chris-eibl

   added

   OS-windows

   buildThe build process and cross-buildThe build process and cross-build

   on Apr 3, 2026
2. chris-eibl

   changed the title [-]Check early whether tail calling is possible for MSVC builds on Windows[/-] [+]Check early whether tail-calling is possible for MSVC builds on Windows[/+] on Apr 3, 2026
3. itamaro

   added a commit that references this issue on Apr 12, 2026

   GH-148047: Check early whether tail-calling is possible for MSVC buil…

   cbd81d5
4. itamaro commented on Apr 12, 2026

   

   itamaro

   on Apr 12, 2026

   Contributor

   More actions

   merged, thank you!
5. itamaro

   closed this as completedon Apr 12, 2026
6. Fidget-Spinner

   added a commit that references this issue on Apr 14, 2026

   Revert "pythonGH-148047: Check early whether tail-calling is possible…

   0550f09
7. Fidget-Spinner

   reopened this on Apr 14, 2026
8. Fidget-Spinner

   closed this as not plannedon Apr 14, 2026
9. Fidget-Spinner

   added a commit that references this issue on Apr 14, 2026

   gh-148047: Revert "GH-148047: Check early whether tail-calling is pos…

   11da7d4
10. ljfp

    added 2 commits that reference this issue on Apr 25, 2026

    pythonGH-148047: Check early whether tail-calling is possible for MSV…

    ad923b5

    pythongh-148047: Revert "pythonGH-148047: Check early whether tail-ca…

    a236471

Issue actions