go tags 源码
golang tags 代码
文件路径：/src/cmd/go/internal/imports/tags.go
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package imports
import (
"cmd/go/internal/cfg"
"sync"
)
var (
tags map[string]bool
tagsOnce sync.Once
)
// Tags returns a set of build tags that are true for the target platform.
// It includes GOOS, GOARCH, the compiler, possibly "cgo",
// release tags like "go1.13", and user-specified build tags.
func Tags() map[string]bool {
tagsOnce.Do(func() {
tags = loadTags()
})
return tags
}
func loadTags() map[string]bool {
tags := map[string]bool{
cfg.BuildContext.GOOS: true,
cfg.BuildContext.GOARCH: true,
cfg.BuildContext.Compiler: true,
}
if cfg.BuildContext.CgoEnabled {
tags["cgo"] = true
}
for _, tag := range cfg.BuildContext.BuildTags {
tags[tag] = true
}
for _, tag := range cfg.BuildContext.ReleaseTags {
tags[tag] = true
}
return tags
}
var (
anyTags map[string]bool
anyTagsOnce sync.Once
)
// AnyTags returns a special set of build tags that satisfy nearly all
// build tag expressions. Only "ignore" and malformed build tag requirements
// are considered false.
func AnyTags() map[string]bool {
anyTagsOnce.Do(func() {
anyTags = map[string]bool{"*": true}
})
return anyTags
}
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