Go编译开关

【参考】https://ask.csdn.net/questions/1010153

问：Go有没有类似C语言的编译开关

 #ifdef COMPILE_OPTION 

 {编译此代码...} 

＃elif 

答：有，Go有一个叫作构建约束的功能
main.go

package main

func main() {
    println("main()")
    conditionalFunction()
}

a.go

// +build COMPILE_OPTION

package main

func conditionalFunction() {
    println("conditionalFunction")
}

b.go

// +build !COMPILE_OPTION

package main

func conditionalFunction() {
}

输出

% go build -o example ; ./example
main()

% go build -o example -tags COMPILE_OPTION; ./example
main()
conditionalFunction