diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 6a1bc7620c7016..eea1890dfacb9a 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -401,6 +401,8 @@ if (current_toolchain == default_toolchain) {
       "__functional/unary_negate.h",
       "__functional/unwrap_ref.h",
       "__functional/weak_result_type.h",
+      "__fwd/hash.h",
+      "__fwd/pair.h",
       "__fwd/span.h",
       "__fwd/string_view.h",
       "__hash_table",
@@ -587,6 +589,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/aligned_union.h",
       "__type_traits/alignment_of.h",
       "__type_traits/apply_cv.h",
+      "__type_traits/can_extract_key.h",
       "__type_traits/common_reference.h",
       "__type_traits/common_type.h",
       "__type_traits/conditional.h",
@@ -594,6 +597,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/copy_cv.h",
       "__type_traits/copy_cvref.h",
       "__type_traits/decay.h",
+      "__type_traits/dependent_type.h",
       "__type_traits/disjunction.h",
       "__type_traits/enable_if.h",
       "__type_traits/extent.h",
@@ -608,6 +612,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_base_of.h",
       "__type_traits/is_bounded_array.h",
       "__type_traits/is_callable.h",
+      "__type_traits/is_char_like_type.h",
       "__type_traits/is_class.h",
       "__type_traits/is_compound.h",
       "__type_traits/is_const.h",
@@ -625,6 +630,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_floating_point.h",
       "__type_traits/is_function.h",
       "__type_traits/is_fundamental.h",
+      "__type_traits/is_implicitly_default_constructible.h",
       "__type_traits/is_integral.h",
       "__type_traits/is_literal_type.h",
       "__type_traits/is_member_function_pointer.h",
@@ -656,6 +662,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_signed.h",
       "__type_traits/is_signed_integer.h",
       "__type_traits/is_standard_layout.h",
+      "__type_traits/is_swappable.h",
       "__type_traits/is_trivial.h",
       "__type_traits/is_trivially_assignable.h",
       "__type_traits/is_trivially_constructible.h",
@@ -675,20 +682,24 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_volatile.h",
       "__type_traits/lazy.h",
       "__type_traits/make_32_64_or_128_bit.h",
+      "__type_traits/make_const_lvalue_ref.h",
       "__type_traits/make_signed.h",
       "__type_traits/make_unsigned.h",
+      "__type_traits/maybe_const.h",
       "__type_traits/nat.h",
       "__type_traits/negation.h",
       "__type_traits/promote.h",
       "__type_traits/rank.h",
       "__type_traits/remove_all_extents.h",
       "__type_traits/remove_const.h",
+      "__type_traits/remove_const_ref.h",
       "__type_traits/remove_cv.h",
       "__type_traits/remove_cvref.h",
       "__type_traits/remove_extent.h",
       "__type_traits/remove_pointer.h",
       "__type_traits/remove_reference.h",
       "__type_traits/remove_volatile.h",
+      "__type_traits/result_of.h",
       "__type_traits/type_identity.h",
       "__type_traits/type_list.h",
       "__type_traits/underlying_type.h",
@@ -697,6 +708,7 @@ if (current_toolchain == default_toolchain) {
       "__utility/as_const.h",
       "__utility/auto_cast.h",
       "__utility/cmp.h",
+      "__utility/convert_to_integral.h",
       "__utility/declval.h",
       "__utility/exchange.h",
       "__utility/forward.h",