[llvm] [gn build] Port 7ded638ea33b (PR #212995)

[Nico Weber via llvm-commits]

https://github.com/nico created https://github.com/llvm/llvm-project/pull/212995

None

>From 8ef5d660e495b3b19476aaae3cfde0fc399c651d Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis at chromium.org>
Date: Thu, 30 Jul 2026 06:55:36 -0400
Subject: [PATCH] [gn build] Port 7ded638ea33b

---
 llvm/utils/gn/secondary/libcxx/include/BUILD.gn | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 5d6dbe70e47b7..95053ad4cd341 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -1123,6 +1123,7 @@ if (current_toolchain == default_toolchain) {
       "__fwd/mdspan.h",
       "__fwd/memory.h",
       "__fwd/memory_resource.h",
+      "__fwd/optional.h",
       "__fwd/ostream.h",
       "__fwd/pair.h",
       "__fwd/queue.h",
@@ -1317,6 +1318,14 @@ if (current_toolchain == default_toolchain) {
       "__numeric/transform_exclusive_scan.h",
       "__numeric/transform_inclusive_scan.h",
       "__numeric/transform_reduce.h",
+      "__optional/common.h",
+      "__optional/comparison.h",
+      "__optional/hash.h",
+      "__optional/make_optional.h",
+      "__optional/nullopt_t.h",
+      "__optional/optional.h",
+      "__optional/optional_ref.h",
+      "__optional/swap.h",
       "__ostream/basic_ostream.h",
       "__ostream/print.h",
       "__ostream/put_character_sequence.h",