[libc++] Removes Clang-16 support. (llvm#87810)

With the release of Clang-18 we no longer officially support Clang-16.

Author: mordante

libcxx/include/__algorithm/simd_utils.h

@@ -27,7 +27,7 @@ _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
 // TODO: Find out how altivec changes things and allow vectorizations there too.
-#if _LIBCPP_STD_VER >= 14 && defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1700 && !defined(__ALTIVEC__)
+#if _LIBCPP_STD_VER >= 14 && defined(_LIBCPP_CLANG_VER) && !defined(__ALTIVEC__)
 #  define _LIBCPP_HAS_ALGORITHM_VECTOR_UTILS 1
 #else
 #  define _LIBCPP_HAS_ALGORITHM_VECTOR_UTILS 0

libcxx/include/__config

@@ -44,8 +44,8 @@
 // Warn if a compiler version is used that is not supported anymore
 // LLVM RELEASE Update the minimum compiler versions
 #  if defined(_LIBCPP_CLANG_VER)
-#    if _LIBCPP_CLANG_VER < 1600
-#      warning "Libc++ only supports Clang 16 and later"
+#    if _LIBCPP_CLANG_VER < 1700
+#      warning "Libc++ only supports Clang 17 and later"
 #    endif
 #  elif defined(_LIBCPP_APPLE_CLANG_VER)
 #    if _LIBCPP_APPLE_CLANG_VER < 1500

libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp

@@ -12,7 +12,7 @@
 // UNSUPPORTED: c++03
 
 // TODO: Investigate these failures which break the CI.
-// UNSUPPORTED: clang-16, clang-17, clang-18, clang-19
+// UNSUPPORTED: clang-17, clang-18, clang-19
 
 // TODO: Investigate this failure on GCC 13 (in Ubuntu Jammy)
 // UNSUPPORTED: gcc-13

libcxx/test/std/ranges/range.utility/range.utility.conv/to_deduction.pass.cpp

@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // There is a bug in older versions of Clang that causes trouble with constraints in classes like
 // `ContainerWithDirectCtr`.
-// XFAIL: clang-16, apple-clang-15
+// XFAIL: apple-clang-15
 
 // template<template<class...> class C, input_range R, class... Args>
 //   constexpr auto to(R&& r, Args&&... args);  // Since C++23

libcxx/test/std/utilities/format/format.arguments/format.arg/visit.pass.cpp

@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
 // The tested functionality needs deducing this.
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <format>

libcxx/test/std/utilities/format/format.arguments/format.arg/visit.return_type.pass.cpp

@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
 // The tested functionality needs deducing this.
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <format>

libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.deprecated.verify.cpp

@@ -7,7 +7,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <format>

libcxx/test/std/utilities/variant/variant.visit.member/robust_against_adl.pass.cpp

@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // The tested functionality needs deducing this.
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <variant>

libcxx/test/std/utilities/variant/variant.visit.member/visit.pass.cpp

@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // The tested functionality needs deducing this.
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <variant>

libcxx/test/std/utilities/variant/variant.visit.member/visit_return_type.pass.cpp

@@ -8,7 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 // The tested functionality needs deducing this.
-// UNSUPPORTED: clang-16 || clang-17
+// UNSUPPORTED: clang-17
 // XFAIL: apple-clang
 
 // <variant>