diff --git a/libcxx/test/libcxx/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp b/libcxx/test/libcxx/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
index 3ee213358f352..08c682964c374 100644
--- a/libcxx/test/libcxx/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
+++ b/libcxx/test/libcxx/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
@@ -73,7 +73,7 @@ L link link_to_link
   TEST_VALIDATE_EXCEPTION(
       std::runtime_error,
       [&]([[maybe_unused]] const std::runtime_error& e) {
-        std::string_view what{"tzdb: requested time zone not found"};
+        [[maybe_unused]] std::string_view what{"tzdb: requested time zone not found"};
         TEST_LIBCPP_REQUIRE(
             e.what() == what,
             TEST_WRITE_CONCATENATED("\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
index 761691c2afdcb..890ac23fff832 100644
--- a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains_subrange.pass.cpp
@@ -24,6 +24,7 @@
 //                                              Proj1 proj1 = {}, Proj2 proj2 = {});                 // since C++23
 
 #include <algorithm>
+#include <array>
 #include <cassert>
 #include <concepts>
 #include <ranges>
@@ -130,10 +131,10 @@ constexpr void test_iterators() {
   }
 
   { // range has zero length
-    int a[]       = {};
-    int p[]       = {3, 4, 2};
-    auto whole    = std::ranges::subrange(Iter1(a), Sent1(Iter1(a)));
-    auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
+    std::array<int, 0> a = {};
+    int p[]              = {3, 4, 2};
+    auto whole           = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
+    auto subrange        = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
     {
       bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
       assert(!ret);
@@ -145,10 +146,10 @@ constexpr void test_iterators() {
   }
 
   { // subrange has zero length
-    int a[]       = {3, 4, 2};
-    int p[]       = {};
-    auto whole    = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
-    auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p)));
+    int a[]              = {3, 4, 2};
+    std::array<int, 0> p = {};
+    auto whole           = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
+    auto subrange        = std::ranges::subrange(Iter2(p.data()), Sent2(Iter2(p.data())));
     {
       bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
       assert(ret);
@@ -160,10 +161,10 @@ constexpr void test_iterators() {
   }
 
   { // range and subrange both have zero length
-    int a[]       = {};
-    int p[]       = {};
-    auto whole    = std::ranges::subrange(Iter1(a), Sent1(Iter1(a)));
-    auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(p)));
+    std::array<int, 0> a = {};
+    std::array<int, 0> p = {};
+    auto whole           = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
+    auto subrange        = std::ranges::subrange(Iter2(p.data()), Sent2(Iter2(p.data())));
     {
       bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
       assert(ret);
diff --git a/libcxx/test/std/containers/sequences/vector/vector.modifiers/destory_elements.pass.cpp b/libcxx/test/std/containers/sequences/vector/vector.modifiers/destroy_elements.pass.cpp
similarity index 100%
rename from libcxx/test/std/containers/sequences/vector/vector.modifiers/destory_elements.pass.cpp
rename to libcxx/test/std/containers/sequences/vector/vector.modifiers/destroy_elements.pass.cpp
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
index 5edf22eaacf31..d6bb56d9b78b7 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
@@ -37,7 +37,7 @@ constexpr bool test_non_convert_to_path() {
   static_assert(!std::is_constructible_v<std::fstream, const std::basic_string_view<CharT>>);
 
   // Char* pointers
-  if constexpr (!std::is_same_v<CharT, char>)
+  if constexpr (!std::is_same_v<CharT, char> && !std::is_same_v<CharT, fs::path::value_type>)
     static_assert(!std::is_constructible_v<std::fstream, const CharT*>);
 
   // Iterators
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
index 2f27fd8e6e93d..792b65615679a 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
@@ -38,7 +38,7 @@ constexpr bool test_non_convert_to_path() {
   static_assert(!std::is_constructible_v<std::ifstream, const std::basic_string_view<CharT>>);
 
   // Char* pointers
-  if constexpr (!std::is_same_v<CharT, char>)
+  if constexpr (!std::is_same_v<CharT, char> && !std::is_same_v<CharT, fs::path::value_type>)
     static_assert(!std::is_constructible_v<std::ifstream, const CharT*>);
 
   // Iterators
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
index e55adfd83fc3c..602bdadd85813 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
@@ -37,7 +37,7 @@ constexpr bool test_non_convert_to_path() {
   static_assert(!std::is_constructible_v<std::ofstream, const std::basic_string_view<CharT>>);
 
   // Char* pointers
-  if constexpr (!std::is_same_v<CharT, char>)
+  if constexpr (!std::is_same_v<CharT, char> && !std::is_same_v<CharT, fs::path::value_type>)
     static_assert(!std::is_constructible_v<std::ofstream, const CharT*>);
 
   // Iterators
diff --git a/libcxx/test/std/iterators/predef.iterators/move.iterators/sized_sentinel.compile.pass.cpp b/libcxx/test/std/iterators/predef.iterators/move.iterators/sized_sentinel.compile.pass.cpp
index cb49086dd6802..998b13ed49455 100644
--- a/libcxx/test/std/iterators/predef.iterators/move.iterators/sized_sentinel.compile.pass.cpp
+++ b/libcxx/test/std/iterators/predef.iterators/move.iterators/sized_sentinel.compile.pass.cpp
@@ -21,6 +21,7 @@ struct unsized_it {
   using difference_type = std::ptrdiff_t;
 
   value_type& operator*() const;
+  unsized_it& operator++();
   bool operator==(const unsized_it&) const;
   difference_type operator-(const unsized_it&) const { return 0; }
 };
diff --git a/libcxx/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp b/libcxx/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
index 212804356a056..5bc149b54d022 100644
--- a/libcxx/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
@@ -17,6 +17,7 @@
 #include <cassert>
 #include <climits>
 #include <cstdint>
+#include <limits>
 #include <random>
 #include <type_traits>
 
@@ -67,12 +68,14 @@ T basic_gcd(T m, T n) {
 template <typename Input>
 void do_fuzzy_tests() {
   std::mt19937 gen(1938);
-  std::uniform_int_distribution<Input> distrib;
+  using DistIntType         = std::conditional_t<sizeof(Input) == 1, int, Input>; // See N4981 [rand.req.genl]/1.5
+  constexpr Input max_input = std::numeric_limits<Input>::max();
+  std::uniform_int_distribution<DistIntType> distrib(0, max_input);
 
   constexpr int nb_rounds = 10000;
   for (int i = 0; i < nb_rounds; ++i) {
-    Input n = distrib(gen);
-    Input m = distrib(gen);
+    Input n = static_cast<Input>(distrib(gen));
+    Input m = static_cast<Input>(distrib(gen));
     assert(std::gcd(n, m) == basic_gcd(n, m));
   }
 }
diff --git a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/current_zone.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/current_zone.pass.cpp
index 2c43e121613c7..f31a679dd6214 100644
--- a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/current_zone.pass.cpp
+++ b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/current_zone.pass.cpp
@@ -32,7 +32,7 @@ static void set_tz(std::string zone) {
   // Unlike POSIX it does not mention the string of putenv becomes part
   // of the environment.
 
-  int status = _putenv_s("TZ", zone.c_str(), 1);
+  int status = _putenv_s("TZ", zone.c_str());
   assert(status == 0);
 }
 
diff --git a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/locate_zone.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/locate_zone.pass.cpp
index 4d600fcdf40e3..8dd895fd21814 100644
--- a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/locate_zone.pass.cpp
+++ b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.access/locate_zone.pass.cpp
@@ -40,7 +40,7 @@ static void test_exception([[maybe_unused]] std::string_view zone) {
   TEST_VALIDATE_EXCEPTION(
       std::runtime_error,
       [&]([[maybe_unused]] const std::runtime_error& e) {
-        std::string_view what{"tzdb: requested time zone not found"};
+        [[maybe_unused]] std::string_view what{"tzdb: requested time zone not found"};
         TEST_LIBCPP_REQUIRE(
             e.what() == what,
             TEST_WRITE_CONCATENATED("\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
diff --git a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/current_zone.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/current_zone.pass.cpp
index e6497e26323ce..98509c298ebcb 100644
--- a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/current_zone.pass.cpp
+++ b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/current_zone.pass.cpp
@@ -34,7 +34,7 @@ static void set_tz(std::string zone) {
   // Unlike POSIX it does not mention the string of putenv becomes part
   // of the environment.
 
-  int status = _putenv_s("TZ", zone.c_str(), 1);
+  int status = _putenv_s("TZ", zone.c_str());
   assert(status == 0);
 }
 
diff --git a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
index f929dafcc9683..08ce48dfd0edb 100644
--- a/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
+++ b/libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/locate_zone.pass.cpp
@@ -42,7 +42,7 @@ static void test_exception([[maybe_unused]] std::string_view zone) {
   TEST_VALIDATE_EXCEPTION(
       std::runtime_error,
       [&]([[maybe_unused]] const std::runtime_error& e) {
-        std::string_view what{"tzdb: requested time zone not found"};
+        [[maybe_unused]] std::string_view what{"tzdb: requested time zone not found"};
         TEST_LIBCPP_REQUIRE(
             e.what() == what,
             TEST_WRITE_CONCATENATED("\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
diff --git a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
index d7374351afa8b..accb601dd0036 100644
--- a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
+++ b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
@@ -209,6 +209,7 @@ template <class T, class Tuple>
 static constexpr bool can_make_from_tuple =
     std::is_same_v<decltype(test_make_from_tuple<T, Tuple>(T{}, Tuple{})), uint8_t>;
 
+#ifdef _LIBCPP_VERSION
 template <class T, class Tuple>
 auto test_make_from_tuple_impl(T&&, Tuple&& t)
     -> decltype(std::__make_from_tuple_impl<T>(
@@ -224,6 +225,7 @@ uint32_t test_make_from_tuple_impl(...) {
 template <class T, class Tuple>
 static constexpr bool can_make_from_tuple_impl =
     std::is_same_v<decltype(test_make_from_tuple_impl<T, Tuple>(T{}, Tuple{})), uint8_t>;
+#endif // _LIBCPP_VERSION
 
 struct A {
   int a;
@@ -263,23 +265,23 @@ static_assert(can_make_from_tuple<float, std::tuple<double>>);
 // Test std::__make_from_tuple_impl constraints.
 
 // reinterpret_cast
-static_assert(!can_make_from_tuple_impl<int*, std::tuple<A*>>);
-static_assert(can_make_from_tuple_impl<A*, std::tuple<A*>>);
+LIBCPP_STATIC_ASSERT(!can_make_from_tuple_impl<int*, std::tuple<A*>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<A*, std::tuple<A*>>);
 
 // const_cast
-static_assert(!can_make_from_tuple_impl<char*, std::tuple<const char*>>);
-static_assert(!can_make_from_tuple_impl<volatile char*, std::tuple<const volatile char*>>);
-static_assert(can_make_from_tuple_impl<volatile char*, std::tuple<volatile char*>>);
-static_assert(can_make_from_tuple_impl<char*, std::tuple<char*>>);
-static_assert(can_make_from_tuple_impl<const char*, std::tuple<char*>>);
-static_assert(can_make_from_tuple_impl<const volatile char*, std::tuple<volatile char*>>);
+LIBCPP_STATIC_ASSERT(!can_make_from_tuple_impl<char*, std::tuple<const char*>>);
+LIBCPP_STATIC_ASSERT(!can_make_from_tuple_impl<volatile char*, std::tuple<const volatile char*>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<volatile char*, std::tuple<volatile char*>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<char*, std::tuple<char*>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<const char*, std::tuple<char*>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<const volatile char*, std::tuple<volatile char*>>);
 
 // static_cast
-static_assert(!can_make_from_tuple_impl<int, std::tuple<D>>);
-static_assert(!can_make_from_tuple_impl<D, std::tuple<int>>);
-static_assert(can_make_from_tuple_impl<long, std::tuple<int>>);
-static_assert(can_make_from_tuple_impl<double, std::tuple<float>>);
-static_assert(can_make_from_tuple_impl<float, std::tuple<double>>);
+LIBCPP_STATIC_ASSERT(!can_make_from_tuple_impl<int, std::tuple<D>>);
+LIBCPP_STATIC_ASSERT(!can_make_from_tuple_impl<D, std::tuple<int>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<long, std::tuple<int>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<double, std::tuple<float>>);
+LIBCPP_STATIC_ASSERT(can_make_from_tuple_impl<float, std::tuple<double>>);
 
 } // namespace LWG3528
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
index db05691c55818..039a2373348c4 100644
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
@@ -516,7 +516,7 @@ constexpr void test_swap_sfinae() {
   }
 }
 
-_LIBCPP_CONSTEXPR_SINCE_CXX20 void test_swap_noexcept() {
+TEST_CONSTEXPR_CXX20 void test_swap_noexcept() {
   {
     using V = std::variant<int, NothrowMoveable>;
     static_assert(std::is_swappable_v<V> && has_swap_member<V>(), "");
diff --git a/libcxx/test/support/msvc_stdlib_force_include.h b/libcxx/test/support/msvc_stdlib_force_include.h
index 6c26085e72c45..6e3424ec63749 100644
--- a/libcxx/test/support/msvc_stdlib_force_include.h
+++ b/libcxx/test/support/msvc_stdlib_force_include.h
@@ -91,7 +91,7 @@ const AssertionDialogAvoider assertion_dialog_avoider{};
 #include <version>
 
 #if _HAS_CXX23
-#  define TEST_STD_VER 99
+#  define TEST_STD_VER 23
 #elif _HAS_CXX20
 #  define TEST_STD_VER 20
 #elif _HAS_CXX17