Add pipeline for cppruntime tests

.CI/Jenkinsfile.cpp

@@ -0,0 +1,51 @@
+def common
+pipeline {
+  agent none
+  options {
+    newContainerPerStage()
+  }
+  environment {
+    LC_ALL = 'C.UTF-8'
+  }
+  // stages are ordered according to execution time; highest time first
+  // nodes are selected based on a priority (in Jenkins config)
+  stages {
+    stage('Environment') {
+      agent {
+        label 'linux'
+      }
+      steps {
+        script {
+          if (changeRequest()) {
+            def buildNumber = env.BUILD_NUMBER as int
+            if (buildNumber > 1) milestone(buildNumber - 1)
+            milestone(buildNumber)
+          }
+          common = load("${env.workspace}/.CI/common.groovy")
+        }
+      }
+    }
+    stage('cpp-test') {
+      agent {
+         dockerfile {
+          additionalBuildArgs '--pull'
+          dir '.CI/cache'
+          label 'linux'
+          args "--mount type=volume,source=runtest-cpp-test-cache,target=/cache/runtest " +
+               "--mount type=volume,source=omlibrary-cache,target=/cache/omlibrary"
+        }
+      }
+      environment {
+        RUNTESTDB = "/cache/runtest/"
+        LIBRARIES = "/cache/omlibrary"
+      }
+      steps {
+        script {
+          common.buildOMC('clang', 'clang++', '--without-hwloc')
+          common.makeLibsAndCache()
+          common.partest(true, '-cppruntime')
+        }
+      }
+    }
+  }
+}

.CI/common.groovy

@@ -68,7 +68,7 @@ void makeLibsAndCache(libs='core') {
   sh "find libraries"
   sh "ln -s '${env.LIBRARIES}/svn' '${env.LIBRARIES}/git' libraries/"
   generateTemplates()
-  def cmd = "make -j${numLogicalCPU()} --output-sync omlibrary-${libs} ReferenceFiles"
+  def cmd = "make -j${numLogicalCPU()} --output-sync omlibrary-${libs} ReferenceFiles omc-diff"
   if (env.SHARED_LOCK) {
     lock(env.SHARED_LOCK) {
       sh cmd