let codegen makefile handle more logic

Author: joerocklin

Makefile

@@ -25,7 +25,7 @@ tag:
 
 .PHONY: install-aws-codegen
 install-aws-codegen:
-	go install -ldflags "-X main.commit=$(commitSHA) -X main.date=$(dateStr)" ./code-generation/cmd/aws-service-operator-codegen
+	${MAKE} -C code-generation install
 
 .PHONY: aws-codegen
 aws-codegen:

code-generation/Makefile

@@ -5,6 +5,10 @@ dateStr := $(shell date +%s)
 build:
 	go build -ldflags "-X main.commit=$(commitSHA) -X main.date=$(dateStr)" ./cmd/aws-service-operator-codegen
 
+.PHONY: install
+install: rebuild
+	go install -ldflags "-X main.commit=$(commitSHA) -X main.date=$(dateStr)" ./cmd/aws-service-operator-codegen
+
 .PHONY: install-bindata
 install-bindata:
 	go get -u github.com/jteeuwen/go-bindata/...