what does //go:build xxx and // +build xxx means in golang?

Question

I always see the code,

//go:build linux
// +build linux

what mean? I don't understand.

just give me some examples

Imagine you need to compile a linux-specific code, using some linux-specific api. — Tiago Peczenyj, Mar 26 '22 at 14:43
More than this: you can define build tags to do some alternative builds like… run integration tests, use some mock / debug / testing implementations, etc. it is the “equivalent” to #ifdef in C preprocessor — Tiago Peczenyj, Mar 26 '22 at 15:29

score 3 · Accepted Answer · answered Mar 26 '22 at 14:33

In older versions of Go, you would say

// +build linux

where the new syntax from Go 1.17 and up is

//go:build linux

but they do the same thing: only include this file in the Linux build.

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