Allow setting CGO_ENABLED

Makefile: Allow setting CGO_ENABLED (defaults to 0).

Author: dvzrv

Diff for: Makefile

@@ -34,6 +34,7 @@ PROJECT := github.com/kubernetes-sigs/cri-tools
 BINDIR ?= /usr/local/bin
 
 VERSION ?= $(shell git describe --tags --dirty --always | sed 's/^v//')
+CGO_ENABLED ?= 0
 GOFLAGS ?= -trimpath
 GO_LDFLAGS := $(GO_LDFLAGS) -X $(PROJECT)/pkg/version.Version=$(VERSION)
 
@@ -64,7 +65,7 @@ critest:
 	@$(MAKE) -B $(CRITEST)
 
 $(CRITEST):
-	CGO_ENABLED=0 $(GO_TEST) -c -o $@ \
+	CGO_ENABLED=$(CGO_ENABLED) $(GO_TEST) -c -o $@ \
 		-ldflags '$(GO_LDFLAGS)' \
 		$(GOFLAGS) \
 	     $(PROJECT)/cmd/critest
@@ -73,7 +74,7 @@ crictl:
 	@$(MAKE) -B $(CRICTL)
 
 $(CRICTL):
-	CGO_ENABLED=0 $(GO_BUILD) -o $@ \
+	CGO_ENABLED=$(CGO_ENABLED) $(GO_BUILD) -o $@ \
 		-ldflags '$(GO_LDFLAGS)' \
 		$(GOFLAGS) \
 		$(PROJECT)/cmd/crictl