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gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist. #140548

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Merged
merged 9 commits into from
Nov 1, 2025
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gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist. #140548

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6812a5f
fix
XChaitanyaX Oct 24, 2025
d8901b1
add space after #endif
XChaitanyaX Oct 24, 2025
95e9b6f
unnecessary `!` mark
XChaitanyaX Oct 24, 2025
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fix indent
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XChaitanyaX Oct 28, 2025
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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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Original file line number Diff line number Diff line change
@@ -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) && (_MSC_VER < 1950)
# error "You need at least VS 2026 / PlatformToolset v145 for tail calling."
# 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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