golang gc 代码
文件路径：/src/go/build/gc.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.
/go:build gc
package build
import (
"path/filepath"
"runtime"
)
/ getToolDir returns the default value of ToolDir.
func getToolDir() string {
return filepath.Join(runtime.GOROOT(), "pkg/tool/"+runtime.GOOS+"_"+runtime.GOARCH)
}