JOCA-349 Create the multibranch job in Jenkins

Jenkinsfile

@@ -0,0 +1,110 @@
+pipeline {
+  agent { label 'cpp-ec2-al2' }
+
+  options {
+    timestamps()
+    disableConcurrentBuilds()
+  }
+
+  environment {
+    BUILD_TYPE    = 'Release'
+    LLVM_PROJECTS = 'clang;lld'
+    BUILD_DIR     = 'build'
+
+    // Use GCC 10 toolchain installed on the AMI
+    CC  = 'gcc10-gcc'
+    CXX = 'gcc10-g++'
+  }
+
+  stages {
+
+    stage('Toolchain overview') {
+      steps {
+        sh '''
+          set -eux
+
+          echo "=== compilers ==="
+          which gcc || true
+          gcc --version || true
+          which g++ || true
+          g++ --version || true
+
+          echo "=== GCC 10 toolset ==="
+          which gcc10-gcc || true
+          gcc10-gcc --version || true
+          which gcc10-g++ || true
+          gcc10-g++ --version || true
+
+          echo "=== clang ==="
+          which clang || true
+          clang --version || true
+
+          echo "=== python ==="
+          which python || true
+          python --version || true
+          which python3 || true
+          python3 --version || true
+          which python3.8 || true
+          python3.8 --version || true
+
+          echo "=== cmake ==="
+          which cmake || true
+          cmake --version || true
+          which cmake3 || true
+          cmake3 --version || true
+
+          echo "=== ninja ==="
+          which ninja || true
+          ninja --version || true
+          which ninja-build || true
+          ninja-build --version || true
+
+          echo "=== pkg-config ==="
+          which pkg-config || true
+          pkg-config --version || true
+        '''
+      }
+    }
+
+    stage('Checkout') {
+      steps {
+        checkout scm
+      }
+    }
+
+    stage('Configure') {
+      steps {
+        sh '''
+          set -eux
+
+          mkdir -p "${BUILD_DIR}"
+
+          cmake3 -S llvm -B "${BUILD_DIR}" -G Ninja \
+            -DCMAKE_BUILD_TYPE="${BUILD_TYPE}" \
+            -DLLVM_ENABLE_PROJECTS="${LLVM_PROJECTS}" \
+            -DCMAKE_C_COMPILER="${CC}" \
+            -DCMAKE_CXX_COMPILER="${CXX}" \
+            -DPython3_EXECUTABLE=/usr/bin/python3.8
+        '''
+      }
+    }
+
+    stage('Build') {
+      steps {
+        sh '''
+          set -eux
+          cmake3 --build "${BUILD_DIR}" -j"$(nproc)"
+        '''
+      }
+    }
+
+    // stage('Smoke tests') {
+    //   steps {
+    //     sh '''
+    //       set -eux
+    //       ctest --test-dir "${BUILD_DIR}" -R clang -j"$(nproc)" || true
+    //     '''
+    //   }
+    // }
+  }
+}