From 156ab8750056c3ff440af0937806d8cdb2623816 Mon Sep 17 00:00:00 2001
From: Alex Rønne Petersen <alex@alexrp.com>
Date: Wed, 5 Feb 2025 10:50:09 +0100
Subject: libcxx: Update to Clang 20.

See:

* https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319
* https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701

We're dropping support for C++03 for Zig due to the first change; it would be
insane to ship 1018 duplicate header files just for this outdated use case.

As a result of the second change, I had to bring in a subset of the headers from
llvm-libc since libc++ now depends on these. Hopefully we can continue to get
away with not copying the entirety of llvm-libc.
---
 lib/libcxx/include/iterator | 139 +++++++++++++++++++++++---------------------
 1 file changed, 72 insertions(+), 67 deletions(-)

(limited to 'lib/libcxx/include/iterator')

diff --git a/lib/libcxx/include/iterator b/lib/libcxx/include/iterator
index fca75f0a19..74ee712b94 100644
--- a/lib/libcxx/include/iterator
+++ b/lib/libcxx/include/iterator
@@ -679,76 +679,81 @@ template <class E> constexpr const E* data(initializer_list<E> il) noexcept;
 
 */
 
-#include <__config>
-#include <__iterator/access.h>
-#include <__iterator/advance.h>
-#include <__iterator/back_insert_iterator.h>
-#include <__iterator/distance.h>
-#include <__iterator/front_insert_iterator.h>
-#include <__iterator/insert_iterator.h>
-#include <__iterator/istream_iterator.h>
-#include <__iterator/istreambuf_iterator.h>
-#include <__iterator/iterator.h>
-#include <__iterator/iterator_traits.h>
-#include <__iterator/move_iterator.h>
-#include <__iterator/next.h>
-#include <__iterator/ostream_iterator.h>
-#include <__iterator/ostreambuf_iterator.h>
-#include <__iterator/prev.h>
-#include <__iterator/reverse_iterator.h>
-#include <__iterator/wrap_iter.h>
-
-#if _LIBCPP_STD_VER >= 14
-#  include <__iterator/reverse_access.h>
-#endif
-
-#if _LIBCPP_STD_VER >= 17
-#  include <__iterator/data.h>
-#  include <__iterator/empty.h>
-#  include <__iterator/size.h>
-#endif
-
-#if _LIBCPP_STD_VER >= 20
-#  include <__iterator/common_iterator.h>
-#  include <__iterator/concepts.h>
-#  include <__iterator/counted_iterator.h>
-#  include <__iterator/default_sentinel.h>
-#  include <__iterator/incrementable_traits.h>
-#  include <__iterator/indirectly_comparable.h>
-#  include <__iterator/iter_move.h>
-#  include <__iterator/iter_swap.h>
-#  include <__iterator/mergeable.h>
-#  include <__iterator/move_sentinel.h>
-#  include <__iterator/permutable.h>
-#  include <__iterator/projected.h>
-#  include <__iterator/readable_traits.h>
-#  include <__iterator/sortable.h>
-#  include <__iterator/unreachable_sentinel.h>
-#endif
-
-#include <version>
+#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
+#  include <__cxx03/iterator>
+#else
+#  include <__config>
+#  include <__iterator/access.h>
+#  include <__iterator/advance.h>
+#  include <__iterator/back_insert_iterator.h>
+#  include <__iterator/distance.h>
+#  include <__iterator/front_insert_iterator.h>
+#  include <__iterator/insert_iterator.h>
+#  include <__iterator/istream_iterator.h>
+#  include <__iterator/istreambuf_iterator.h>
+#  include <__iterator/iterator.h>
+#  include <__iterator/iterator_traits.h>
+#  include <__iterator/move_iterator.h>
+#  include <__iterator/next.h>
+#  include <__iterator/ostream_iterator.h>
+#  include <__iterator/ostreambuf_iterator.h>
+#  include <__iterator/prev.h>
+#  include <__iterator/reverse_iterator.h>
+#  include <__iterator/wrap_iter.h>
+
+#  if _LIBCPP_STD_VER >= 14
+#    include <__iterator/reverse_access.h>
+#  endif
+
+#  if _LIBCPP_STD_VER >= 17
+#    include <__iterator/data.h>
+#    include <__iterator/empty.h>
+#    include <__iterator/size.h>
+#  endif
+
+#  if _LIBCPP_STD_VER >= 20
+#    include <__iterator/common_iterator.h>
+#    include <__iterator/concepts.h>
+#    include <__iterator/counted_iterator.h>
+#    include <__iterator/default_sentinel.h>
+#    include <__iterator/incrementable_traits.h>
+#    include <__iterator/indirectly_comparable.h>
+#    include <__iterator/iter_move.h>
+#    include <__iterator/iter_swap.h>
+#    include <__iterator/mergeable.h>
+#    include <__iterator/move_sentinel.h>
+#    include <__iterator/permutable.h>
+#    include <__iterator/projected.h>
+#    include <__iterator/readable_traits.h>
+#    include <__iterator/sortable.h>
+#    include <__iterator/unreachable_sentinel.h>
+#  endif
+
+#  include <version>
 
 // standard-mandated includes
 
 // [iterator.synopsis]
-#include <compare>
-#include <concepts>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
-#  include <variant>
-#endif
-
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <cstdlib>
-#  include <exception>
-#  include <new>
-#  include <type_traits>
-#  include <typeinfo>
-#  include <utility>
-#endif
+#  include <compare>
+#  include <concepts>
+
+#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#    pragma GCC system_header
+#  endif
+
+#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
+#    include <variant>
+#  endif
+
+#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#    include <cstddef>
+#    include <cstdlib>
+#    include <exception>
+#    include <new>
+#    include <type_traits>
+#    include <typeinfo>
+#    include <utility>
+#  endif
+#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
 
 #endif // _LIBCPP_ITERATOR
-- 
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