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We should fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist. #140513

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We should fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist.#140513
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3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesbuildThe build process and cross-buildThe build process and cross-buildeasyinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
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opened on Oct 23, 2025
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Bug report

Bug description:

The code should look something like this:

#if _Py_TAIL_CALL_INTERP && (defined(__clang__) || defined(__GNUC__))
#    if !_Py__has_attribute(preserve_none) || !!_Py__has_attribute(musttail)
#        error "This compiler does not have support for efficient tail calling."
#    endif
#endif

CPython versions tested on:

CPython main branch, 3.15, 3.14

Operating systems tested on:

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    3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesbuildThe build process and cross-buildThe build process and cross-buildeasyinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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