From 1c8f0b8909f342201f84def1efb8c6fb4386cc2c Mon Sep 17 00:00:00 2001
From: Alex Rønne Petersen <alex@alexrp.com>
Date: Fri, 23 Aug 2024 02:59:46 +0200
Subject: libcxx: Update to LLVM 19.

* Moved the tz.cpp patch to experimental/tzdb.cpp.
* Extended the __config_site patch to a few more files.
---
 .../include/__string/constexpr_c_functions.h       | 27 +++++++++++++++++-----
 1 file changed, 21 insertions(+), 6 deletions(-)

(limited to 'lib/libcxx/include/__string/constexpr_c_functions.h')

diff --git a/lib/libcxx/include/__string/constexpr_c_functions.h b/lib/libcxx/include/__string/constexpr_c_functions.h
index 198f0f5e68..a978f816f1 100644
--- a/lib/libcxx/include/__string/constexpr_c_functions.h
+++ b/lib/libcxx/include/__string/constexpr_c_functions.h
@@ -35,18 +35,33 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 // of elements as opposed to a number of bytes.
 enum class __element_count : size_t {};
 
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_strlen(const char* __str) {
+template <class _Tp>
+inline const bool __is_char_type = false;
+
+template <>
+inline const bool __is_char_type<char> = true;
+
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+template <>
+inline const bool __is_char_type<char8_t> = true;
+#endif
+
+template <class _Tp>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t __constexpr_strlen(const _Tp* __str) _NOEXCEPT {
+  static_assert(__is_char_type<_Tp>, "__constexpr_strlen only works with char and char8_t");
   // GCC currently doesn't support __builtin_strlen for heap-allocated memory during constant evaluation.
   // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70816
-#ifdef _LIBCPP_COMPILER_GCC
   if (__libcpp_is_constant_evaluated()) {
+#if _LIBCPP_STD_VER >= 17 && defined(_LIBCPP_COMPILER_CLANG_BASED)
+    if constexpr (is_same_v<_Tp, char>)
+      return __builtin_strlen(__str);
+#endif
     size_t __i = 0;
     for (; __str[__i] != '\0'; ++__i)
       ;
     return __i;
   }
-#endif
-  return __builtin_strlen(__str);
+  return __builtin_strlen(reinterpret_cast<const char*>(__str));
 }
 
 // Because of __libcpp_is_trivially_lexicographically_comparable we know that comparing the object representations is
@@ -108,7 +123,7 @@ __constexpr_memcmp_equal(const _Tp* __lhs, const _Up* __rhs, __element_count __n
     }
     return true;
   } else {
-    return __builtin_memcmp(__lhs, __rhs, __count * sizeof(_Tp)) == 0;
+    return ::__builtin_memcmp(__lhs, __rhs, __count * sizeof(_Tp)) == 0;
   }
 }
 
@@ -209,7 +224,7 @@ __constexpr_memmove(_Tp* __dest, _Up* __src, __element_count __n) {
         std::__assign_trivially_copyable(__dest[__i], __src[__i]);
     }
   } else if (__count > 0) {
-    ::__builtin_memmove(__dest, __src, (__count - 1) * sizeof(_Tp) + __libcpp_datasizeof<_Tp>::value);
+    ::__builtin_memmove(__dest, __src, (__count - 1) * sizeof(_Tp) + __datasizeof_v<_Tp>);
   }
   return __dest;
 }
-- 
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