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libstdc++: Workaround Clang bug with __array_rank built-in [PR118559]

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We started using the __array_rank built-in with r15-1252-g6f0dfa6f1acdf7
but that built-in is buggy in versions of Clang up to and including 19.

libstdc++-v3/ChangeLog:

	PR libstdc++/118559
	* include/std/type_traits (rank, rank_v): Do not use
	__array_rank for Clang 19 and older.
This commit is contained in:
Jonathan Wakely 2025-02-19 14:46:32 +00:00 • committed by Jonathan Wakely
parent 57f65c5c02
commit c0e865f73d
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1 changed files with 4 additions and 2 deletions
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libstdc++-v3/include/std/type_traits
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@ -1484,7 +1484,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
/// rank
#if _GLIBCXX_USE_BUILTIN_TRAIT(__array_rank)
#if _GLIBCXX_USE_BUILTIN_TRAIT(__array_rank) \
&& (!defined(__clang__) || __clang_major__ >= 20) // PR118559
template<typename _Tp>
struct rank
: public integral_constant<std::size_t, __array_rank(_Tp)> { };
@ -3656,7 +3657,8 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
#if _GLIBCXX_USE_BUILTIN_TRAIT(__array_rank)
#if _GLIBCXX_USE_BUILTIN_TRAIT(__array_rank) \
&& (!defined(__clang__) || __clang_major__ >= 20) // PR118559
template <typename _Tp>
inline constexpr size_t rank_v = __array_rank(_Tp);
#else