You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: goflags.go
    path of file: ./repos/gccrs/libgo/go/cmd/go/internal/base
    
    the code of the file until where you have to start completion: // 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 base

import (
	"flag"
	"fmt"
	"runtime"
	"strings"

	"cmd/go/internal/cfg"
)

var goflags []string // cached $GOFLAGS list; can be -x or --x form

// GOFLAGS returns the flags from $GOFLAGS.
// The list can be assumed to contain one string per flag,
// with each string either beginning with -name or --name.
func GOFLAGS() []string {
	InitGOFLAGS()
	return goflags
}

// InitGOFLAGS initializes the goflags list from $GOFLAGS.
// If goflags is already initialized, it does nothing.
func InitGOFLAGS() {
	if goflags != nil { // already initialized
		return
	}

	goflags = strings.Fields(cfg.Getenv("GOFLAGS"))
	if len(goflags) == 0 {
		// nothing to do; avoid work on later InitGOFLAGS call
		goflags = []string{}
		return
	}

	// Ignore bad flag in go env and go bug, because
	// they are what people reach for when debugging
	// a problem, and maybe they're debugging GOFLAGS.
	// (Both will show the GOFLA
    
func InitGOFLAGS() {
	if goflags != nil { // already initialized
		return
	}

	goflags = strings.Fields(cfg.Getenv("GOFLAGS"))
	if len(goflags) == 0 {
		// nothing to do; avoid work on later InitGOFLAGS call
		goflags = []string{}
		return
	}

	// Ignore bad flag in go env and go bug, because
	// they are what people reach for when debugging
	// a problem, and maybe they're debugging GOFLAGS.
	// (Both will show the GOFLAGS setting if let succeed.)
	hideErrors := cfg.CmdName == "env" || cfg.CmdName == "bug"

	// Each of the words returned by strings.Fields must be its own flag.
	// To set flag arguments use -x=value instead of -x value.
	// For boolean flags, -x is fine instead of -x=true.
	for _, f := range goflags {
		// Check that every flag looks like -x --x -x=value or --x=value.
		if !strings.HasPrefix(f, "-") || f == "-" || f == "--" || strings.HasPrefix(f, "---") || strings.HasPrefix(f, "-=") || strings.HasPrefix(f, "--=") {
			if hideErrors {
				continue
			}
			Fatalf("go: parsing $GOFLAGS: non-flag %q", f)
		}

		name := f[1:]
		if name[0] == '-' {
			name = name[1:]
		}
		if i := strings.Index(name, "="); i >= 0 {
			name = name[:i]
		}
		if !hasFlag(Go, name) {
			if hideErrors {
				continue
			}
			Fatalf("go: parsing $GOFLAGS: unknown flag -%s", name)
		}
	}
}