[CI] Try to build Boost + LLVM + RG3 at once and upload artifacts

.github/workflows/build.yml

@@ -36,13 +36,58 @@ jobs:
           toolset: msvc
           link: static
 
-      # Build LLVM 16.0.4
-      - name: Download LLVM
-        uses: llvm/actions/get-llvm-project-src@main
+      # Try to locate llvm binaries
+      - name: Cache LLVM binaries
+        id: cache-llvm-binaries
+        uses: actions/cache@v3
         with:
+          key: "${{ runner.os }}-build-llvmorg-16.0.4"
+          path: |
+            llvm_repo/build/MinSizeRel
+            llvm_repo/llvm/include
+            llvm_repo/clang/include
+            llvm_repo/clang-tools-extra/include
+            llvm_repo/cmake
+
+      # Checkout & Build LLVM 16.0.4 (Need check cache here. On cache miss - build from scratch!)
+      - name: Checkout LLVM
+        if: steps.cache-llvm-binaries.outputs.cache-hit != 'true'
+        uses: actions/checkout@v3
+        with:
+          submodules: "recursive"
+          repository: "llvm/llvm-project"
           ref: "llvmorg-16.0.4"
+          path: "llvm_repo"
 
-      # Build project via cmake
-      # Build python whl packages
-      # Compress things
-      # Send artifacts to GitHub
+      - name: Build LLVM
+        if: steps.cache-llvm-binaries.outputs.cache-hit != 'true'
+        working-directory: llvm_repo
+        run: |
+          mkdir build
+          cmake -DLLVM_ENABLE_PROJECTS="clang" -DCMAKE_BUILD_TYPE="MinSizeRel" -S llvm -B build -G Ninja
+          cd build
+          cmake --build . --config MinSizeRel
+
+      # Build our project
+      - name: Build RG3
+        env:
+          LLVM_DIR: ${{ github.workspace }}/llvm_repo/build/lib/cmake/llvm
+          CLANG_DIR: ${{ github.workspace }}/llvm_repo/build/lib/cmake/clang
+          BOOST_ROOT: ${{ steps.install-boost.outputs.BOOST_ROOT }}
+        run: |
+          mkdir build
+          cmake -DCMAKE_BUILD_TYPE="MinSizeRel" -B build -G Ninja
+          cd build
+          cmake -- build . --config MinSizeRel
+
+      - name: Create distribution package
+        run: |
+          mkdir dist
+          mv PyBind/rg3py.pyi dist
+          mv build/PyBind/rg3py.pyd dist
+
+      - name: Upload RG3 artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: "RG3"
+          path: dist