+# Copyright (c) 2019 AT&T Intellectual Property.
+# Copyright (c) 2019 Nokia.
+#
+# Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+#
+# 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.
+
+
+#------------------------------------------------------------------------------
+#
+#------------------------------------------------------------------------------
+ifndef ROOT_DIR
+$(error ROOT_DIR NOT DEFINED)
+endif
+ifndef CACHE_DIR
+$(error CACHE_DIR NOT DEFINED)
+endif
+
+#------------------------------------------------------------------------------
+#
+#------------------------------------------------------------------------------
+
+GO_CACHE_DIR?=$(abspath $(CACHE_DIR)/go)
+
+#------------------------------------------------------------------------------
+#
+#------------------------------------------------------------------------------
+ifndef MAKE_GO_TARGETS
+MAKE_GO_TARGETS:=1
+
+
+.PHONY: FORCE go-build go-test go-test-fmt go-fmt go-clean
+
+FORCE:
+
+
+GOOS=$(shell go env GOOS)
+GOCMD=go
+GOBUILD=$(GOCMD) build -a -installsuffix cgo
+GORUN=$(GOCMD) run -a -installsuffix cgo
+GOCLEAN=$(GOCMD) clean
+GOTEST=$(GOCMD) test -v
+GOGET=$(GOCMD) get
+
+GOFILES:=$(shell find $(ROOT_DIR) -name '*.go' -not -name '*_test.go')
+GOALLFILES:=$(shell find $(ROOT_DIR) -name '*.go')
+GOMODFILES:=go.mod go.sum
+
+
+.SECONDEXPANSION:
+$(GO_CACHE_DIR)/%: $(GOFILES) $(GOMODFILES) $$(BUILDDEPS)
+ @echo "Building:\t$*"
+ @eval GO111MODULE=on GOSUMDB=off GO_ENABLED=0 GOOS=linux $(BUILDARGS) $(GOBUILD) -o $@ ./$*
+
+
+.SECONDEXPANSION:
+$(GO_CACHE_DIR)/%_test: $(GOALLFILES) $(GOMODFILES) $$(BUILDDEPS) FORCE
+ @echo "Testing:\t$*"
+ @eval GO111MODULE=on GOSUMDB=off GO_ENABLED=0 GOOS=linux $(BUILDARGS) $(GOTEST) -coverprofile $(COVEROUT) -c -o $@ ./$*
+ @if test -e $@ ; then eval $(TESTENV) $@ -test.coverprofile $(COVEROUT); else true ; fi
+ @if test -e $@ ; then go tool cover -html=$(COVEROUT) -o $(COVERHTML); else true ; fi
+
+
+.SECONDEXPANSION:
+go-build: GO_TARGETS:=
+go-build: $$(GO_TARGETS)
+
+.SECONDEXPANSION:
+go-test: GO_TARGETS:=
+go-test: $$(GO_TARGETS)
+
+go-test-fmt: $(GOFILES)
+ @(RESULT="$$(gofmt -l $^)"; test -z "$${RESULT}" || (echo -e "gofmt failed:\n$${RESULT}" && false) )
+
+go-fmt: $(GOFILES)
+ gofmt -w -s $^
+
+go-mod-tidy: FORCE
+ GO111MODULE=on GOSUMDB=off go mod tidy
+
+go-mod-download: FORCE
+ GO111MODULE=on GOSUMDB=off go mod download
+
+go-clean: GO_TARGETS:=
+go-clean:
+ @echo " > Cleaning build cache"
+ @-rm -rf $(GO_TARGETS)* 2> /dev/null
+ go clean 2> /dev/null
+
+
+endif
+
+#------------------------------------------------------------------------------
+#
+#-------------------------------------------------------------------- ----------
+
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME): BUILDDEPS:=$(XAPP_BUILDDEPS)
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME): BUILDARGS:=$(XAPP_BUILDARGS)
+
+
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test: BUILDDEPS:=$(XAPP_BUILDDEPS)
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test: BUILDARGS:=$(XAPP_BUILDARGS)
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test: COVEROUT:=$(abspath $(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_cover.out)
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test: COVERHTML:=$(abspath $(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_cover.html)
+$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test: TESTENV:=$(XAPP_TESTENV)
+
+go-build: GO_TARGETS+=$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)
+go-test: GO_TARGETS+=$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test
+go-clean: GO_TARGETS+=$(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME) $(GO_CACHE_DIR)/$(XAPP_ROOT)/$(XAPP_NAME)_test