[llvm] [Github][libc++] Bump Ubuntu ver back to 26.04 and remove clang-format for Generated Files check (PR #226219)

[Lucas Mellone via llvm-commits]

https://github.com/lknknm updated https://github.com/llvm/llvm-project/pull/226219

>From eb8adf7c637da6df346a5b838cc4e84f4929f677 Mon Sep 17 00:00:00 2001
From: Lucas Mellone <github.snugness349 at passinbox.com>
Date: Thu, 24 Sep 2026 18:13:24 +0200
Subject: [PATCH 1/4] bump clang-format version

---
 .github/workflows/libcxx-pr-check-generated-files.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/libcxx-pr-check-generated-files.yml b/.github/workflows/libcxx-pr-check-generated-files.yml
index 66f2735b08eab..99f013452c0b8 100644
--- a/.github/workflows/libcxx-pr-check-generated-files.yml
+++ b/.github/workflows/libcxx-pr-check-generated-files.yml
@@ -9,7 +9,7 @@ permissions:
 
 jobs:
   check_generated_files:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     if: github.repository == 'llvm/llvm-project'
     steps:
       - name: Fetch LLVM sources
@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         uses: aminya/setup-cpp at 8170d66c458f4a045220b7b0966c10940bb2a15d # v1.8.1
         with:
-          clangformat: 17.0.1
+          clangformat: 23.0.1
           ninja: true
 
       - name: Check generated files

>From db384edf3f1e8e76cab99e7a272efc06226601b0 Mon Sep 17 00:00:00 2001
From: Lucas Mellone <github.snugness349 at passinbox.com>
Date: Thu, 24 Sep 2026 18:20:27 +0200
Subject: [PATCH 2/4] 23.0.1 -> 23.1.0

---
 .github/workflows/libcxx-pr-check-generated-files.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/libcxx-pr-check-generated-files.yml b/.github/workflows/libcxx-pr-check-generated-files.yml
index 99f013452c0b8..35b07567170cb 100644
--- a/.github/workflows/libcxx-pr-check-generated-files.yml
+++ b/.github/workflows/libcxx-pr-check-generated-files.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         uses: aminya/setup-cpp at 8170d66c458f4a045220b7b0966c10940bb2a15d # v1.8.1
         with:
-          clangformat: 23.0.1
+          clangformat: 23.1.0
           ninja: true
 
       - name: Check generated files

>From 31f2cc616e61b2a93df0ddd16be8f2b716e63263 Mon Sep 17 00:00:00 2001
From: Lucas Mellone <github.snugness349 at passinbox.com>
Date: Thu, 24 Sep 2026 18:46:26 +0200
Subject: [PATCH 3/4] remove: clang-format

---
 .github/workflows/libcxx-pr-check-generated-files.yml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.github/workflows/libcxx-pr-check-generated-files.yml b/.github/workflows/libcxx-pr-check-generated-files.yml
index 35b07567170cb..cd307fd09e073 100644
--- a/.github/workflows/libcxx-pr-check-generated-files.yml
+++ b/.github/workflows/libcxx-pr-check-generated-files.yml
@@ -20,7 +20,6 @@ jobs:
       - name: Install dependencies
         uses: aminya/setup-cpp at 8170d66c458f4a045220b7b0966c10940bb2a15d # v1.8.1
         with:
-          clangformat: 23.1.0
           ninja: true
 
       - name: Check generated files

>From b31597891e7d9f3f775d39df940e0fa5916afcbb Mon Sep 17 00:00:00 2001
From: Lucas Mellone <github.snugness349 at passinbox.com>
Date: Thu, 24 Sep 2026 18:50:49 +0200
Subject: [PATCH 4/4] remove Install dependencies check

---
 .github/workflows/libcxx-pr-check-generated-files.yml | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/.github/workflows/libcxx-pr-check-generated-files.yml b/.github/workflows/libcxx-pr-check-generated-files.yml
index cd307fd09e073..8edca1b057bc9 100644
--- a/.github/workflows/libcxx-pr-check-generated-files.yml
+++ b/.github/workflows/libcxx-pr-check-generated-files.yml
@@ -17,11 +17,6 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Install dependencies
-        uses: aminya/setup-cpp at 8170d66c458f4a045220b7b0966c10940bb2a15d # v1.8.1
-        with:
-          ninja: true
-
       - name: Check generated files
         run: libcxx/utils/ci/run-buildbot check-generated-output
         env: