ci: use prebuilt llgo v0.12.0 and keep LLVM for clang (#610)

This commit updates the CI configuration to use prebuilt llgo v0.12.0
releases instead of building from source, while maintaining LLVM
dependency for clang access.

Changes:
- Add download-llgo.sh script to fetch prebuilt llgo releases
- Update action.yml to use download script instead of source checkout
- Keep LLVM/clang dependency as requested in issue #609
- Remove unnecessary LLVM dev packages (llvm-dev, libclang-dev, lld, etc.)
- Retain only clang-19 for compilation needs
- Add verification step for llgo and clang installation

Benefits:
- Faster CI builds (no source compilation)
- Simpler dependency management
- More reliable with official releases
- Reduced complexity while keeping clang access

Related: #609, #590

Generated with [codeagent](https://github.com/qbox/codeagent)

Co-authored-by: xgopilot <[email protected]>
Co-authored-by: luoliwoshang <[email protected]>

Author: 3 people

.github/actions/setup-llcppg/action.yml

@@ -1,5 +1,5 @@
 name: "Setup llcppg"
-description: "Install dependencies, set up Go, set up LLGo, install llcppg"
+description: "Install dependencies, set up Go, download LLGo release, install llcppg"
 inputs:
   go:
     description: "Go version to install"
@@ -8,18 +8,12 @@ inputs:
     description: "LLVM version to install (e.g. 18)"
     default: "19"
   llgo:
-    description: "LLGo git ref or tag"
-    default: "e4218f90d7926d31c1ffae3965a4e36228d38fd2"
+    description: "LLGo version to download (e.g. v0.12.0)"
+    default: "v0.12.0"
 runs:
   using: "composite"
   steps:
   - uses: actions/checkout@v4
-  - name: Checkout LLGo
-    uses: actions/checkout@v4
-    with:
-      repository: 'goplus/llgo'
-      path: '.llgo'
-      ref: ${{inputs.llgo}}
   - name: Set up Go
     uses: actions/setup-go@v4
     with:
@@ -41,15 +35,21 @@ runs:
       echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-${{inputs.llvm}} main" | sudo tee /etc/apt/sources.list.d/llvm.list
       wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
       sudo apt-get update
-      sudo apt-get install -y llvm-${{inputs.llvm}}-dev clang-${{inputs.llvm}} libclang-${{inputs.llvm}}-dev lld-${{inputs.llvm}} libunwind-${{inputs.llvm}}-dev libc++-${{inputs.llvm}}-dev pkg-config libgc-dev libssl-dev zlib1g-dev libffi-dev libuv1-dev
+      sudo apt-get install -y clang-${{inputs.llvm}} pkg-config libgc-dev libssl-dev zlib1g-dev libffi-dev libuv1-dev
       echo "/usr/lib/llvm-${{inputs.llvm}}/bin" >> $GITHUB_PATH
-  - name: Install LLGo
+  - name: Download LLGo release
     shell: bash
-    working-directory: .llgo
     run: |
-      go install -v ./cmd/llgo/...
+      bash .github/actions/setup-llcppg/download-llgo.sh ${{inputs.llgo}} .llgo
+      echo "$GITHUB_WORKSPACE/.llgo/bin" >> $GITHUB_PATH
       export LLGO_ROOT=$GITHUB_WORKSPACE/.llgo
       echo "LLGO_ROOT=$LLGO_ROOT" >> $GITHUB_ENV
+  - name: Verify LLGo installation
+    shell: bash
+    run: |
+      echo "LLGO_ROOT: $LLGO_ROOT"
+      llgo version
+      clang --version
   - name: Build
     shell: bash
     run: go build -v ./...

.github/actions/setup-llcppg/download-llgo.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# Script to download and extract LLGo release
+# Usage: ./download-llgo.sh <version> <install_dir>
+# Example: ./download-llgo.sh v0.12.0 ./llgo
+
+set -e
+
+VERSION=$1
+INSTALL_DIR=$2
+
+if [ -z "$VERSION" ] || [ -z "$INSTALL_DIR" ]; then
+    echo "Usage: $0 <version> <install_dir>"
+    echo "Example: $0 v0.12.0 ./llgo"
+    exit 1
+fi
+
+# Detect OS and architecture
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+ARCH=$(uname -m)
+
+# Map architecture names
+case $ARCH in
+    x86_64)
+        ARCH="amd64"
+        ;;
+    aarch64|arm64)
+        ARCH="arm64"
+        ;;
+    *)
+        echo "Unsupported architecture: $ARCH"
+        exit 1
+        ;;
+esac
+
+# Construct download URL
+# Format: llgo{version}.{os}-{arch}.tar.gz
+# Example: llgo0.12.0.darwin-arm64.tar.gz or llgo0.12.0.linux-amd64.tar.gz
+# Remove 'v' prefix from version if present
+VERSION_NUMBER="${VERSION#v}"
+FILENAME="llgo${VERSION_NUMBER}.${OS}-${ARCH}.tar.gz"
+URL="https://github.com/goplus/llgo/releases/download/${VERSION}/${FILENAME}"
+
+echo "Downloading LLGo ${VERSION} for ${OS}-${ARCH}..."
+echo "URL: $URL"
+
+# Create install directory
+mkdir -p "$INSTALL_DIR"
+
+# Download and extract
+curl -L -o "/tmp/${FILENAME}" "$URL"
+tar -xzf "/tmp/${FILENAME}" -C "$INSTALL_DIR"
+rm "/tmp/${FILENAME}"
+
+echo "LLGo ${VERSION} has been installed to ${INSTALL_DIR}"
+echo "Binary location: ${INSTALL_DIR}/bin/llgo"
+
+# Verify installation
+if [ -f "${INSTALL_DIR}/bin/llgo" ]; then
+    echo "Installation verified successfully"
+    ls -lh "${INSTALL_DIR}/bin/llgo"
+else
+    echo "Error: llgo binary not found at ${INSTALL_DIR}/bin/llgo"
+    exit 1
+fi