Make CGO_ENABLED configurable for etcd 3.4

Signed-off-by: Arka Saha <arkas1@vmware.com>

build

@@ -11,6 +11,8 @@ if [[ -n "${FAILPOINTS:-}" ]]; then
 	GIT_SHA="$GIT_SHA"-FAILPOINTS
 fi
 
+CGO_ENABLED="${CGO_ENABLED:-0}"
+
 # Set GO_LDFLAGS="-s" for building without symbols for debugging.
 GO_LDFLAGS="${GO_LDFLAGS:-} -X ${REPO_PATH}/version.GitSHA=${GIT_SHA}"
 
@@ -70,12 +72,12 @@ etcd_build() {
 
 	# Static compilation is useful when etcd is run in a container. $GO_BUILD_FLAGS is OK
 	# shellcheck disable=SC2086
-	CGO_ENABLED=0 go build ${GO_BUILD_FLAGS:-} \
+	CGO_ENABLED=${CGO_ENABLED} go build ${GO_BUILD_FLAGS:-} \
 		-installsuffix cgo \
 		-ldflags "$GO_LDFLAGS" \
 		-o "${out}/etcd" ${REPO_PATH} || return
 	# shellcheck disable=SC2086
-	CGO_ENABLED=0 go build ${GO_BUILD_FLAGS:-} \
+	CGO_ENABLED=${CGO_ENABLED} go build ${GO_BUILD_FLAGS:-} \
 		-installsuffix cgo \
 		-ldflags "$GO_LDFLAGS" \
 		-o "${out}/etcdctl" ${REPO_PATH}/etcdctl || return
@@ -96,7 +98,7 @@ tools_build() {
 	do
 		echo "Building" "'${tool}'"...
 		# shellcheck disable=SC2086
-		CGO_ENABLED=0 go build ${GO_BUILD_FLAGS} \
+		CGO_ENABLED=${CGO_ENABLED} go build ${GO_BUILD_FLAGS} \
 		  -installsuffix cgo \
 		  -ldflags "${GO_LDFLAGS}" \
 		  -o "${out}/${tool}" "${REPO_PATH}/${tool}" || return

functional/build

@@ -2,12 +2,14 @@
 
 set -euo pipefail
 
+CGO_ENABLED="${CGO_ENABLED:-0}"
+
 if ! [[ "$0" =~ "functional/build" ]]; then
   echo "must be run from repository root"
   exit 255
 fi
 
-CGO_ENABLED=0 go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-agent ./functional/cmd/etcd-agent
-CGO_ENABLED=0 go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-proxy ./functional/cmd/etcd-proxy
-CGO_ENABLED=0 go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-runner ./functional/cmd/etcd-runner
-CGO_ENABLED=0 go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-tester ./functional/cmd/etcd-tester
+CGO_ENABLED=${CGO_ENABLED} go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-agent ./functional/cmd/etcd-agent
+CGO_ENABLED=${CGO_ENABLED} go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-proxy ./functional/cmd/etcd-proxy
+CGO_ENABLED=${CGO_ENABLED} go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-runner ./functional/cmd/etcd-runner
+CGO_ENABLED=${CGO_ENABLED} go build -v -installsuffix cgo -ldflags "-s" -o ./bin/etcd-tester ./functional/cmd/etcd-tester