Add clang build on OpenShift Cluster

Add Dockerfile, OpenShift build config, and OpenShift image stream, to
compile OAI using clang, notably to get compiler warnings and keep it
OAI compilable using clang.

ci-scripts/cls_cluster.py

@@ -273,11 +273,18 @@ class Cluster:
 			ranbuild_job = self._start_build('ran-build')
 			attemptedImages += ['ran-build']
 
-			wait = ranbuild_job is not None and physim_job is not None and self._wait_build_end([ranbuild_job, physim_job], 1200)
-			if not wait: logging.error('error during build of ranbuild_job or physim_job')
+			self._recreate_is_tag('oai-clang', imageTag, 'openshift/oai-clang-is.yaml')
+			self._recreate_bc('oai-clang', imageTag, 'openshift/oai-clang-bc.yaml')
+			self._retag_image_statement('ran-base', 'image-registry.openshift-image-registry.svc:5000/oaicicd-ran/ran-base', baseTag, 'docker/Dockerfile.clang.rhel8.2')
+			clang_job = self._start_build('oai-clang')
+			attemptedImages += ['oai-clang']
+
+			wait = ranbuild_job is not None and physim_job is not None and clang_job is not None and self._wait_build_end([ranbuild_job, physim_job, clang_job], 1200)
+			if not wait: logging.error('error during build of ranbuild_job or physim_job or clang_job')
 			status = status and wait
 			self.cmd.run(f'oc logs {ranbuild_job} &> cmake_targets/log/ran-build.log')
 			self.cmd.run(f'oc logs {physim_job} &> cmake_targets/log/oai-physim.log')
+			self.cmd.run(f'oc logs {clang_job} &> cmake_targets/log/oai-clang.log')
 			self.cmd.run(f'oc get pods.metrics.k8s.io &>> cmake_targets/log/build-metrics.log', '\$', 10)
 
 		if status:

docker/Dockerfile.clang.rhel8.2

@@ -0,0 +1,43 @@
+#/*
+# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+# * contributor license agreements.  See the NOTICE file distributed with
+# * this work for additional information regarding copyright ownership.
+# * The OpenAirInterface Software Alliance licenses this file to You under
+# * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+# * except in compliance with the License.
+# * You may obtain a copy of the License at
+# *
+# *      http://www.openairinterface.org/?page_id=698
+# *
+# * Unless required by applicable law or agreed to in writing, software
+# * distributed under the License is distributed on an "AS IS" BASIS,
+# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# * See the License for the specific language governing permissions and
+# * limitations under the License.
+# *-------------------------------------------------------------------------------
+# * For more information about the OpenAirInterface (OAI) Software Alliance:
+# *      contact@openairinterface.org
+# */
+#---------------------------------------------------------------------
+#
+# Dockerfile for the Open-Air-Interface BUILD service
+#   Valid for RHEL8
+#
+#---------------------------------------------------------------------
+
+FROM ran-base:latest AS oai-clang
+
+RUN rm -Rf /oai-ran
+WORKDIR /oai-ran
+COPY . .
+
+#only install LLVM (clang, ...) for this container, the others don't need it
+RUN yum install -y llvm-toolset
+
+#run build_oai to build the target image
+RUN /bin/sh oaienv && \
+    cd cmake_targets && \
+    mkdir -p log && \
+    export CC=/usr/bin/clang && \
+    export CXX=/usr/bin/clang++ && \
+    ./build_oai --phy_simulators --gNB --eNB --nrUE --UE --ninja --verbose-ci --noavx512 -c --cmake-opt -DCMAKE_C_FLAGS=-Werror --cmake-opt -DCMAKE_CXX_FLAGS=-Werror

openshift/oai-clang-bc.yaml

@@ -0,0 +1,39 @@
+#/*
+# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+# * contributor license agreements.  See the NOTICE file distributed with
+# * this work for additional information regarding copyright ownership.
+# * The OpenAirInterface Software Alliance licenses this file to You under
+# * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+# * except in compliance with the License.
+# * You may obtain a copy of the License at
+# *
+# *      http://www.openairinterface.org/?page_id=698
+# *
+# * Unless required by applicable law or agreed to in writing, software
+# * distributed under the License is distributed on an "AS IS" BASIS,
+# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# * See the License for the specific language governing permissions and
+# * limitations under the License.
+# *-------------------------------------------------------------------------------
+# * For more information about the OpenAirInterface (OAI) Software Alliance:
+# *      contact@openairinterface.org
+# */
+#---------------------------------------------------------------------
+
+kind: BuildConfig
+apiVersion: build.openshift.io/v1
+metadata:
+  name: "oai-clang"
+spec:
+    runPolicy: "Serial"
+    nodeSelector:
+        kubernetes.io/hostname: theseus
+    source:
+        type: "Binary"
+    strategy:
+        dockerStrategy:
+            dockerfilePath: "docker/Dockerfile.clang.rhel8.2"
+    output:
+        to:
+            kind: "ImageStreamTag"
+            name: "oai-clang:latest"

openshift/oai-clang-is.yaml

@@ -0,0 +1,30 @@
+#/*
+# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+# * contributor license agreements.  See the NOTICE file distributed with
+# * this work for additional information regarding copyright ownership.
+# * The OpenAirInterface Software Alliance licenses this file to You under
+# * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+# * except in compliance with the License.
+# * You may obtain a copy of the License at
+# *
+# *      http://www.openairinterface.org/?page_id=698
+# *
+# * Unless required by applicable law or agreed to in writing, software
+# * distributed under the License is distributed on an "AS IS" BASIS,
+# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# * See the License for the specific language governing permissions and
+# * limitations under the License.
+# *-------------------------------------------------------------------------------
+# * For more information about the OpenAirInterface (OAI) Software Alliance:
+# *      contact@openairinterface.org
+# */
+#---------------------------------------------------------------------
+#
+apiVersion: image.openshift.io/v1
+kind: ImageStream
+metadata:
+  name: oai-clang
+  namespace: oaicicd-ran
+spec:
+  lookupPolicy:
+    local: true