How Can I Determine the GOOS and GOARCH Values Used to Build a Go Executable?

Determining GOOS and GOARCH Values for Built Executables

In the realm of Go programming, the values of GOOS and GOARCH play a crucial role in shaping the compilation process. These environment variables define the target operating system and architecture for which a Go binary is intended. However, once an executable is built, how can we determine the specific values of GOOS and GOARCH used during its creation?

Exploring the Runtime Package

The runtime package offers a solution to this query. It contains constants and functions that provide insights into the environment variables used at compile time. In particular, the constants runtime.GOOS and runtime.GOARCH store the values of GOOS and GOARCH, respectively.

Accessing Recorded Values

These constants in the runtime package hold the exact values of GOOS and GOARCH that were in effect when the executable was built. This means that even if the environment variables have changed since compilation, the executable still retains the original values that governed its creation.

Example Demonstration

Consider the following simple Go program:

<code class="go">package main

import (
    "fmt"
    "runtime"
)

func main() {
    fmt.Println(runtime.GOOS) // prints target operating system
    fmt.Println(runtime.GOARCH) // prints target architecture
}</code>

If you run this program with the environment variables GOOS=windows and GOARCH=amd64, you will observe the following output:

windows
amd64

Building the program into an executable using go build will result in the same output when the executable is executed.

Conclusion

By utilizing the constants provided by the runtime package, we can readily determine the values of GOOS and GOARCH used to build a given Go executable. This information can be valuable for debugging, troubleshooting, and understanding the compilation context of a binary.

The above is the detailed content of How Can I Determine the GOOS and GOARCH Values Used to Build a Go Executable?. For more information, please follow other related articles on the PHP Chinese website!