'what does //go:build xxx and // +build xxx means in golang? [duplicate]

I always see the code,

//go:build linux
// +build linux

what mean? I don't understand.

just give me some examples

go build

Solution 1:^[1]

These are build constraints, see https://pkg.go.dev/go/build#hdr-Build_Constraints

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.

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	gonutz