How to Differentiate Code for Linux and Windows in Go using Build Constraints and File Names?

How to Build Different Code for Linux and Windows in Go

When developing cross-platform libraries in Go, there may be instances where you need to utilize different methods for different operating systems. This raises the question of how to efficiently organize the build process in such scenarios.

One approach is to employ build constraints and file names.

Build Constraints

Build constraints allow you to conditionally include or exclude code based on specific build conditions. For example, the following build constraint includes code for Unix-like operating systems:

<code class="go">// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris</code>

File Names

Another method is to use file names to differentiate code for different platforms. For instance:

• stat_linux.go: Contains code specific to Linux
• stat_windows.go: Contains code specific to Windows

Example

Consider the following example from the Go standard library:

<code class="go">// stat_unix.go
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
package stat

func unixImplementation() {}</code>

<code class="go">// stat_windows.go
// +build windows
package stat

func windowsImplementation() {}</code>

In this example, the file stat_unix.go is conditionally included for Unix-like operating systems, while stat_windows.go is included only for Windows.

The Go tools and standard library originally relied on file naming for platform-specific code. However, as requirements became more complex, build constraints have become the preferred approach.

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