[Golang] 利用build tags達到不同的build config

package main

import (
	"fmt"
)

var flagString string

func main() {
	fmt.Println("This build with ldflag:", flagString)
}

$ go build -ldflags '-X main.flagString "test"'

$ ./main
This build with ldflag: test

//+build debug

package main

var TestString string = "test debug"
var TestString2 string = " and it will run every module with debug tag."

func GetConfigString() string {
	return "it is debug....."
}

//+build !debug

package main

var TestString string = "test release"
var TestString2 string = " and it will run every module as no debug tag."

func GetConfigString() string {
	return "it is release....."
}

package main

import (
	"fmt"
)

func main() {
	fmt.Println("This build is ", TestString, TestString2, GetConfigString())
}

$ go build -tags debug .
$ ./main
This build is  test debug  and it will run every module with debug tag. it is debug.....

$ go build .
$ ./main
This build is  test release  and it will run every module as no debug tag. it is release.....