Testing prebuilt binaries for CI

Author: alinalihassan

.github/workflows/ci.yaml

@@ -51,20 +51,39 @@ jobs:
           author_email: github_action@lesma.com
           message: 'Committing clang-format changes'
 
-      - name: Cache LLVM and Clang
-        id: cache-llvm
-        uses: actions/cache@v4
-        with:
-          path: |
-            C:/Program Files/LLVM
-            ./llvm
-          key: llvm-21-${{ matrix.os }}
-
-      - name: Install LLVM and Clang
-        uses: KyleMayes/install-llvm-action@v2
-        with:
-          version: "21"
-          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
+      # - name: Cache LLVM and Clang
+      #   id: cache-llvm
+      #   uses: actions/cache@v4
+      #   with:
+      #     path: |
+      #       C:/Program Files/LLVM
+      #       ./llvm
+      #     key: llvm-21-${{ matrix.os }}
+
+      # - name: Install LLVM and Clang
+      #   uses: KyleMayes/install-llvm-action@v2
+      #   with:
+      #     version: "21"
+      #     cached: ${{ steps.cache-llvm.outputs.cache-hit }}
+
+      - name: Install LLVM, Clang, and LLD (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          sudo add-apt-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-21 main"
+          sudo apt-get update
+          sudo apt-get install -y llvm-21 llvm-21-dev clang-21 lld-21 libc++-21-dev libc++abi-21-dev
+          sudo update-alternatives --install /usr/bin/llvm-config llvm-config /usr/bin/llvm-config-21 100
+          sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-21 100
+          sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-21 100
+
+      - name: Install LLVM, Clang, and LLD (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install llvm@21 lld
+          echo "/opt/homebrew/opt/llvm@21/bin" >> $GITHUB_PATH
+          echo "LDFLAGS=-L/opt/homebrew/opt/llvm@21/lib" >> $GITHUB_ENV
+          echo "CPPFLAGS=-I/opt/homebrew/opt/llvm@21/include" >> $GITHUB_ENV
 
       - name: Install CMake & Ninja
         uses: lukka/get-cmake@latest