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Title: GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows by chris-eibl · Pull Request #148036 · python/cpython · GitHub

Open Graph Title: GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows by chris-eibl · Pull Request #148036 · python/cpython

X Title: GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows by chris-eibl · Pull Request #148036 · python/cpython

Description: 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. Issue: gh-148047

Open Graph Description: 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 degr...

X Description: 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 degr...

Opengraph URL: https://github.com/python/cpython/pull/148036

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15b0bf1 check tail-calling support in pythoncore.vcxproj chris-eibl Mar 27, 2026 https://github.com/python/cpython/pull/148036/commits/15b0bf141b4b4f123ab391b4011ca9826ad29ad0
92a236d Merge branch 'main' into CheckTailCalling chris-eibl Apr 3, 2026 https://github.com/python/cpython/pull/148036/commits/92a236d6f38cf2a92ff887073d0c968b3907e356
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