[llvm] [Github] Add support for building libc docs in Github actions (PR #69824)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/69824

This patch adds support for building the libc docs in Github actions. This eanbles easily diagnosing doc build failures/warnings in PRs and at the tip of tree.

>From a853975417c35f658056628e36656ce834581ec2 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Sat, 21 Oct 2023 02:15:51 -0700
Subject: [PATCH] [Github] Add support for building libc docs in Github actions

This patch adds support for building the libc docs in Github actions.
This eanbles easily diagnosing doc build failures/warnings in PRs and at
the tip of tree.
---
 .github/workflows/docs.yml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2900f73c77c5a66..aa82043e62eb561 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,10 +15,12 @@ on:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'libc/docs/**'
   pull_request:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'libc/docs/**'
 
 jobs:
   check-docs-build:
@@ -47,6 +49,8 @@ jobs:
               - 'llvm/docs/**'
             clang:
               - 'clang/docs/**'
+            libc:
+              - 'libc/docs/**'
       - name: Setup Python env
         uses: actions/setup-python at v4
         with:
@@ -69,4 +73,10 @@ jobs:
         run: |
           cmake -B clang-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_ENABLE_SPHINX=ON ./llvm
           TZ=UTC ninja -C clang-build docs-clang-html docs-clang-man
+      - name: Build libc docs
+        if: steps.docs-changed-subprojects.outputs.libc_any_changed == 'true'
+        run: |
+          cmake -B libc-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libc" -DLLVM_ENABLE_SPHINX=ON ./runtimes
+          TZ=UTC ninja -C libc-build docs-libc-html
+