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[3.14] gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist (GH-140548) #140923

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Fidget-Spinner merged 1 commit into from
Nov 4, 2025
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[3.14] gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist (GH-140548) #140923

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gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but `pres… 
…erve_none` and `musttail` do not exist. (GH-140548)

Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
(cherry picked from commit 2f60b8f)
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@XChaitanyaX @chris-eibl
XChaitanyaX and chris-eibl committed Nov 2, 2025
commit a6d52fed8714fd3d9c21610e99376bedf6d1f76c
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2025-10-25-08-07-06.gh-issue-140513.6OhLTs.rst
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@@ -0,0 +1,2 @@
Generate a clear compilation error when ``_Py_TAIL_CALL_INTERP`` is enabled but
either ``preserve_none`` or ``musttail`` is not supported.
8 changes: 8 additions & 0 deletions Python/ceval_macros.h
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Expand Up @@ -79,6 +79,14 @@
#endif

#if Py_TAIL_CALL_INTERP
# if 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
# elif defined(_MSC_VER)
# error "Tail calling not supported for MSVC."
# endif

// Note: [[clang::musttail]] works for GCC 15, but not __attribute__((musttail)) at the moment.
# define Py_MUSTTAIL [[clang::musttail]]
# define Py_PRESERVE_NONE_CC __attribute__((preserve_none))
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