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Use Go “Linker” -ldflags to Set Build Variables

I always have to look this up. Here’s how to set variables using the linker (technically not a Go thing). This doesn’t work with constants because it is using the linker to set the variables to their initial values.

package main

const VersionConst = `some`
var Version string

func main() {
  fmt.Println(Version)
}

Then you have to use the -ldflags with it:

go build -ldflags "-X main.Version=v0.1.0" 

Don’t forget the main in there. The linker needs it to find the right symbol. Also, remember this only works for strings.

• See the go tool link -h for more about -X

• go - How to set package variable using -ldflags -X in Golang build
  https://stackoverflow.com/questions/47509272/how-to-set-package-variable-using-ldflags-x-in-golang-build

  #golang #coding #tips #building #variables

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