[llvm] [libcxx] [libc++][CI] Fixes documentation builder. (PR #78327)

[Mark de Wever via llvm-commits]

https://github.com/mordante created https://github.com/llvm/llvm-project/pull/78327

None

>From acdaad884925f5ba3f185305cc574fc32d4120f0 Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Tue, 16 Jan 2024 19:55:14 +0100
Subject: [PATCH] [libc++][CI] Fixes documentation builder.

---
 .github/workflows/docs.yml |  2 +-
 libcxx/docs/index.rst      | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index bf559964ff97b8..5936cdc46a902d 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -138,7 +138,7 @@ jobs:
       - name: Build libcxx docs
         if: steps.docs-changed-subprojects.outputs.libcxx_any_changed == 'true'
         run: |
-          cmake -B libcxx-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx" -DLLVM_ENABLE_SPHINX=ON ./runtimes
+          cmake -B libcxx-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libcxxabi;libcxx;libunwind" -DLLVM_ENABLE_SPHINX=ON ./runtimes
           TZ=UTC ninja -C libcxx-build docs-libcxx-html
       - name: Build libc docs
         if: steps.docs-changed-subprojects.outputs.libc_any_changed == 'true'
diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
index 066d8d87e5526e..00e86bd787e682 100644
--- a/libcxx/docs/index.rst
+++ b/libcxx/docs/index.rst
@@ -4,6 +4,20 @@
 "libc++" C++ Standard Library
 =============================
 
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 Overview
 ========