// and then run them with os.StartProcess or exec.Command.
func HasGoBuild() bool {
	if os.Getenv("GO_GCFLAGS") != "" {
		// It's too much work to require every caller of the go command
		// to pass along "-gcflags="+os.Getenv("GO_GCFLAGS").
		// For now, if $GO_GCFLAGS is set, report that we simply can't
		// run go build.
		return false
	}

	goBuildOnce.Do(func() {

//   - ssa/all/time enables time reporting for all phases
//
// See gc/lex.go for dissection of the option string.
// Example uses:
//
// GO_GCFLAGS=-d=ssa/generic_cse/time,ssa/generic_cse/stats,ssa/generic_cse/debug=3 ./make.bash
//
// BOOT_GO_GCFLAGS=-d='ssa/~^.*scc$/off' GO_GCFLAGS='-d=ssa/~^.*scc$/off' ./make.bash
func PhaseOption(phase, flag string, val int, valString string) string {
	switch phase {
	case "", "help":

	"internal/testenv"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
	"time"
)

var globalSkip = func(t *testing.T) {}

var gcflags string = os.Getenv("GO_GCFLAGS")
var goroot string

func TestMain(m *testing.M) {
	flag.Parse()
	log.SetFlags(log.Lshortfile)
	os.Exit(testMain(m))
}

// tmpDir is used to cleanup logged commands -- s/tmpDir/$TMPDIR/
var tmpDir string

	numberColonRe         = regexp.MustCompile(`^ *\d+:`)
)

var gdb = "gdb"      // Might be "ggdb" on Darwin, because gdb no longer part of XCode
var debugger = "dlv" // For naming files, etc.

var gogcflags = os.Getenv("GO_GCFLAGS")

// optimizedLibs usually means "not running in a noopt test builder".
var optimizedLibs = (!strings.Contains(gogcflags, "-N") && !strings.Contains(gogcflags, "-l"))