How to Find the GOOS and GOARCH Values Used to Build a Go Executable?

How to Determine GOOS and GOARCH Values Used to Build an Executable

As the title suggests, it's possible to ascertain the values of GOOS and GOARCH that were used to compile a specific Go executable.

The key lies in the runtime package, which houses constants that hold this information. These constants are set during compilation and do not affect runtime execution.

Specifically, look for these constants:

• runtime.GOOS - Holds the value of GOOS used during compilation.
• runtime.GOARCH - Holds the value of GOARCH used during compilation.

To illustrate this, consider a simple Go application:

<code class="go">package main

import "fmt"

func main() {
    fmt.Println(runtime.GOOS)
    fmt.Println(runtime.GOARCH)
}</code>

If we execute this code with GOOS=windows and GOARCH=amd64, the output will be:

windows
amd64

Alternatively, if we build an executable from this code, it will retain these GOOS and GOARCH values, even if the environment variables are modified later.

So, to determine the GOOS and GOARCH values used to build an executable, simply:

1. Import the runtime package.
2. Access the runtime.GOOS and runtime.GOARCH constants.
3. Their values will represent the specified environment variables during compilation.

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