ci: hello world testing with different version declarations in go.mod and go versions

.github/actions/test-helloworld/action.yml

@@ -0,0 +1,35 @@
+name: 'Test Hello World'
+description: 'Test Hello World with specific Go and module versions'
+inputs:
+  go-version:
+    description: 'Go version being tested'
+    required: true
+  mod-version:
+    description: 'Go module version to use'
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - name: Test Hello World
+      shell: bash
+      run: |
+        echo "Testing with Go ${{ inputs.go-version }} and go.mod ${{ inputs.mod-version }}"
+        mkdir -p _test/helloworld && cd _test/helloworld
+        cat > go.mod << 'EOL'
+        module hello
+        go ${{ inputs.mod-version }}
+        EOL
+        cat > main.go << 'EOL'
+        package main
+        import (
+          "fmt"
+          "github.com/goplus/llgo/c"
+        )
+        func main() {
+            fmt.Println("Hello, LLGo!")
+            println("Hello, LLGo!")
+            c.Printf(c.Str("Hello, LLGo!\n"))
+        }
+        EOL
+        go mod tidy
+        llgo run .

.github/workflows/llgo.yml

@@ -92,3 +92,54 @@ jobs:
         run: |
           echo "Test lldb with llgo plugin on ${{matrix.os}} with LLVM ${{matrix.llvm}}"
           bash _lldb/runtest.sh -v
+
+  helloworld-test:
+    strategy:
+      matrix:
+        os: [ubuntu-24.04, macos-latest]
+        llvm: [18]
+        go: ['1.20', '1.21', '1.22', '1.23']
+    runs-on: ${{matrix.os}}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        uses: ./.github/actions/setup-deps
+        with:
+          llvm-version: ${{matrix.llvm}}
+
+      - name: Set up Go 1.23 for building llgo
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Install llgo
+        working-directory: compiler
+        run: |
+          go install ./...
+          echo "LLGO_ROOT=$GITHUB_WORKSPACE" >> $GITHUB_ENV
+
+      - name: Set up Go for testing
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{matrix.go}}
+
+      - name: Test Hello World with go.mod 1.20
+        if: matrix.go == '1.20' || matrix.go == '1.21' || matrix.go == '1.22' || matrix.go == '1.23'
+        uses: ./.github/actions/test-helloworld
+        with:
+          go-version: ${{matrix.go}}
+          mod-version: '1.20'
+
+      - name: Test Hello World with go.mod 1.21
+        if: matrix.go == '1.21' || matrix.go == '1.22' || matrix.go == '1.23'
+        uses: ./.github/actions/test-helloworld
+        with:
+          go-version: ${{matrix.go}}
+          mod-version: '1.21'
+
+      - name: Test Hello World with go.mod 1.22
+        if: matrix.go == '1.22' || matrix.go == '1.23'
+        uses: ./.github/actions/test-helloworld
+        with:
+          go-version: ${{matrix.go}}
+          mod-version: '1.22'