Makefile for golang cross-compile binaries (linux, macOS, windows)

Makefile

APPNAME=app

## build: build application binary.
build:build-windows build-linux build-macOS
	@echo "Build done!"

build-windows:build-windows-32 build-windows-64
	@echo "Windows Build done!"

build-windows-64:
	go env -w GOOS=windows
	go env -w GOARCH=amd64
	go build -o bin/$(APPNAME)-windows-amd64.exe

build-windows-32:
	go env -w GOOS=windows
	go env -w GOARCH=386
	go build -o bin/$(APPNAME)-windows-386.exe

build-macOS:build-macOS-64
	@echo "macOS Build done!"

build-macOS-64:
	go env -w GOOS=darwin
	go env -w GOARCH=amd64
	go build -o bin/$(APPNAME)-darwin-amd64

build-linux:build-linux-32 build-linux-64
	@echo "Linux Build done!"
  
build-linux-64:
	go env -w GOOS=linux
	go env -w GOARCH=amd64
	go build -o bin/$(APPNAME)-linux-amd64

build-linux-32:
	go env -w GOOS=linux
	go env -w GOARCH=amd64
	go build -o bin/$(APPNAME)-linux-386