[libc][workflow] improve ci coverage with windows-2025 and arm ubuntu

.github/workflows/libc-fullbuild-tests.yml

@@ -11,12 +11,16 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-24.04
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         include:
-          - c_compiler: clang
+          - os: ubuntu-24.04
+            c_compiler: clang
+            cpp_compiler: clang++
+          - os: ubuntu-24.04-arm
+            c_compiler: clang
             cpp_compiler: clang++
           # TODO: add back gcc build when it is fixed
           # - c_compiler: gcc
@@ -32,6 +36,7 @@ jobs:
     # frequent small object writes.
     - name: Setup ccache
       uses: hendrikmuhs/[email protected]
+      if: runner.arch == 'X64'
       with:
         max-size: 1G
         key: libc_fullbuild_${{ matrix.c_compiler }}
@@ -42,10 +47,16 @@ jobs:
     # - Debian has a multilib setup, so we need to symlink the asm directory.
     #   For more information, see https://wiki.debian.org/Multiarch/LibraryPathOverview
     - name: Prepare dependencies (Ubuntu)
+      shell: bash
       run: |
         sudo apt-get update
         sudo apt-get install -y libmpfr-dev libgmp-dev libmpc-dev ninja-build linux-libc-dev
         sudo ln -sf /usr/include/$(uname -p)-linux-gnu/asm /usr/include/asm
+        if [[ $(uname -m) == 'aarch64' ]]; then
+          wget https://github.com/mozilla/sccache/releases/download/v0.9.1/sccache-v0.9.1-aarch64-unknown-linux-musl.tar.gz
+          tar xvaf sccache-v0.9.1-aarch64-unknown-linux-musl.tar.gz
+          sudo cp sccache-v0.9.1-aarch64-unknown-linux-musl/sccache /usr/bin
+        fi
 
     - name: Set reusable strings
       id: strings

.github/workflows/libc-overlay-tests.yml

@@ -22,10 +22,18 @@ jobs:
             compiler:
               c_compiler: clang
               cpp_compiler: clang++
+          - os: ubuntu-24.04-arm
+            compiler:
+              c_compiler: clang
+              cpp_compiler: clang++
           - os: windows-2022
             compiler:
               c_compiler: clang-cl
               cpp_compiler: clang-cl
+          - os: windows-2025
+            compiler:
+              c_compiler: clang-cl
+              cpp_compiler: clang-cl
           - os: macos-14
             compiler:
               c_compiler: clang
@@ -43,6 +51,7 @@ jobs:
     # frequent small object writes.
     - name: Setup ccache
       uses: hendrikmuhs/ccache-action@v1
+      if: runner.arch == 'X64'
       with:
         max-size: 1G
         key: libc_overlay_build_${{ matrix.os }}_${{ matrix.compiler.c_compiler }}
@@ -54,6 +63,11 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install -y libmpfr-dev libgmp-dev libmpc-dev ninja-build
+        if [[ $(uname -m) == 'aarch64' ]]; then
+          wget https://github.com/mozilla/sccache/releases/download/v0.9.1/sccache-v0.9.1-aarch64-unknown-linux-musl.tar.gz
+          tar xvaf sccache-v0.9.1-aarch64-unknown-linux-musl.tar.gz
+          sudo cp sccache-v0.9.1-aarch64-unknown-linux-musl/sccache /usr/bin
+        fi
 
     # Chocolatey is shipped with Windows runners. Windows Server 2025 recommends WinGet.
     # Consider migrating to WinGet when Windows Server 2025 is available.