feat: add macos LLVM build

Author: simonresch

.github/workflows/build-llvm.yaml

@@ -13,49 +13,39 @@ jobs:
     name: Build LLVM
     strategy:
       matrix:
-        # os: [ubuntu-20.04, macos-11, windows-2019]
-        os: [ubuntu-20.04]
+        # os: [ubuntu-20.04, macos-12, windows-2019]
+        os: [ubuntu-20.04, macos-14]
     runs-on: ${{ matrix.os }}
-    permissions:
-      contents: write # for creating releases
-    container:
-      # Intentionally old ubuntu version with old glibc.
-      image: ubuntu:18.04
     steps:
       - name: checkout
         uses: actions/checkout@v3
-
-      # Install build dependencies.
-      - run: "apt update && apt install -y clang git wget build-essential python3 unzip"
-      # cmake from package manager is to old for the LLVM build.
-      - run: "wget https://github.com/Kitware/CMake/releases/download/v3.30.0-rc2/cmake-3.30.0-rc2-linux-x86_64.sh"
-      - run: "chmod +x cmake-*.sh"
-      - run: "./cmake-*.sh --skip-license --prefix=/usr"
-      # ninja from the package manager is to old for the LLVM build.
-      - run: "wget https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-linux.zip"
-      - run: "unzip ninja-linux.zip -d /usr/bin/"
+      - if: contains(matrix.os, 'ubuntu')
+        run: "sudo apt update && sudo apt install -y ninja-build"
+      - if: contains(matrix.os, 'macos')
+        run: "brew install ninja"
       # Build and package LLVM.
-      - run: "./build-llvm-libs.sh"
-      - uses: actions/upload-artifact@v3
+      - run: "./build-llvm-libs.sh llvm-static-libs-${{ matrix.os }}.tar.gz"
+      - uses: actions/upload-artifact@v4
         with:
-          name: llvm-static-libs
-          path: llvm-static-libs.tar.gz
-      - name: create release
-        id: create-release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          name: llvm-static-libs-${{ matrix.os }}
+          path: llvm-static-libs-${{ matrix.os }}.tar.gz
+
+  create_release:
+    name: Create release
+    runs-on: ubuntu-latest
+    needs: [build_llvm]
+    permissions:
+      contents: write # for creating releases
+    steps:
+      - name: Download Artifacts
+        uses: actions/download-artifact@v4
         with:
-          tag_name: ${{ inputs.tag }}
-          release_name: ${{ inputs.tag }}
-          draft: false
-          prerelease: true
-      - name: upload linux artifact
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
+          pattern: llvm-static-libs-*
+          merge-multiple: true
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
         with:
-          upload_url: ${{ steps.create-release.outputs.upload_url }}
-          asset_path: ./llvm-static-libs.tar.xz
-          asset_name: llvm-static-linux-amd64.tar.xz
-          asset_content_type: application/gzip
+          name: LLVM tooling libraries ${{ inputs.tag }}
+          tag_name: ${{ inputs.tag }}
+          files: llvm-static-libs-*
+          fail_on_unmatched_files: true

CMakeLists.txt

@@ -17,6 +17,10 @@ set(CMAKE_BUILD_TYPE Release)
 
 set(LLVM_PROJECT_TARGET external.llvm-project)
 
+if (NOT(DEFINED LLVM_TARGETS_TO_BUILD))
+    message(FATAL_ERROR "You must set LLVM_TARGETS_TO_BUILD variable with -DLLVM_TARGETS_TO_BUILD=<X86|AArch64>.")
+endif()
+
 include(ExternalProject)
 ExternalProject_Add(${LLVM_PROJECT_TARGET}
     PREFIX ${LLVM_PROJECT_TARGET}
@@ -37,7 +41,7 @@ ExternalProject_Add(${LLVM_PROJECT_TARGET}
         -DLLVM_ENABLE_PROJECTS=clang
         -DLLVM_ENABLE_RTTI=ON
         -DLLVM_ENABLE_PIC=OFF
-        -DLLVM_TARGETS_TO_BUILD=X86
+        -DLLVM_TARGETS_TO_BUILD=${LLVM_TARGETS_TO_BUILD}
         -DLLVM_BUILD_TOOLS=OFF
         -DLLVM_BUILD_TESTS=OFF
         -DLLVM_ENABLE_TERMINFO=OFF

build-llvm-libs.sh

@@ -4,14 +4,30 @@ SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 BUILD_DIR="$SCRIPT_DIR/build"
 LLVM_BUILD_DIR="$BUILD_DIR/external.llvm-project"
 
+OUTPUT_FILE=llvm-static-libs.tar.xz
+if [ "$#" -eq 1 ]
+then
+  OUTPUT_FILE=$1
+fi
+
+CC=clang
+CXX=clang++
+
+TARGET_PLATFORM=X86
+if [ "$(uname)" == "Darwin" ]; then
+  # On Mac we only support the new apple silicon architecture.
+  TARGET_PLATFORM=AArch64
+fi
+
 cd "$SCRIPT_DIR"
-mkdir -p build
-cmake -B build -GNinja .
+mkdir -p $BUILD_DIR
+
+cmake -B build -GNinja -DLLVM_TARGETS_TO_BUILD=${TARGET_PLATFORM} .
 cmake --build build
 
 # Pack everything we need into a tar archive.
 # We only need the header files, static libraries and add
 # a CMake file that makes it easy to link libclangTooling.
 cp $SCRIPT_DIR/cmake/CMakeLists.txt $LLVM_BUILD_DIR
 cd $LLVM_BUILD_DIR
-tar -czvf "$SCRIPT_DIR/llvm-static-libs.tar.xz" include/ lib/*.a CMakeLists.txt
+tar -czvf "$SCRIPT_DIR/$OUTPUT_FILE" include/ lib/*.a CMakeLists.txt