case "gc", "cmd_go_bootstrap", "go1.1":
		return true
	case "linux":
		return goos == "linux" || goos == "android"
	case "solaris":
		return goos == "solaris" || goos == "illumos"
	case "darwin":
		return goos == "darwin" || goos == "ios"
	case goos, goarch:
		return true
	case "unix":
		return unixOS[goos]
	default:
		return false
	}
}

	if goarch == "ppc64" && goos != "aix" {
		return false
	}
	return true
}

func (t *tester) internalLink() bool {
	if gohostos == "dragonfly" {
		// linkmode=internal fails on dragonfly since errno is a TLS relocation.
		return false
	}
	if goos == "android" {
		return false
	}
	if goos == "ios" {
		return false
	}
	if goos == "windows" && goarch == "arm64" {

// goodOSArchFile returns false if the name contains a $GOOS or $GOARCH
// suffix which does not match the current system.
// The recognized name formats are:
//
//	name_$(GOOS).*
//	name_$(GOARCH).*
//	name_$(GOOS)_$(GOARCH).*
//	name_$(GOOS)_test.*
//	name_$(GOARCH)_test.*
//	name_$(GOOS)_$(GOARCH)_test.*
//
// Exceptions:
// if GOOS=android, then files with GOOS=linux are also matched.

func TestChmod(t *testing.T) {
	// Chmod is not supported on wasip1.
	if runtime.GOOS == "wasip1" {
		t.Skip("Chmod is not supported on " + runtime.GOOS)
	}
	t.Parallel()

	f := newFile("TestChmod", t)
	defer Remove(f.Name())
	defer f.Close()
	// Creation mode is read write

	fm := FileMode(0456)
	if runtime.GOOS == "windows" {
		fm = FileMode(0444) // read-only file
	}

	if *target != "" {
		// When -target is set, propagate it to GOOS/GOARCH in our environment
		// so that all commands run with the target GOOS/GOARCH.
		//
		// We do this before even calling "go env", because GOOS/GOARCH can
		// affect other settings we get from go env (notably CGO_ENABLED).
		goos, goarch, ok := strings.Cut(*target, "/")
		if !ok {
			t.Fatalf("bad -target flag %q, expected goos/goarch", *target)
		}
		t.Setenv("GOOS", goos)

	tg.grepStdout("linux amd64", "unexpected GOOS/GOARCH combination")

	tg.setenv("GOOS", "darwin")
	tg.setenv("GOARCH", "arm64")
	tg.run("generate", "gen")
	tg.grepStdout("darwin arm64", "unexpected GOOS/GOARCH combination")
}

func TestGoEnv(t *testing.T) {
	tg := testgo(t)
	tg.parallel()
	defer tg.cleanup()
	tg.setenv("GOOS", "freebsd") // to avoid invalid pair errors
	tg.setenv("GOARCH", "arm")

	// prefer using heapArenaBytes where possible (we need the
	// constant to compute some other constants).
	logHeapArenaBytes = (6+20)*(_64bit*(1-goos.IsWindows)*(1-goarch.IsWasm)*(1-goos.IsIos*goarch.IsArm64)) + (2+20)*(_64bit*goos.IsWindows) + (2+20)*(1-_64bit) + (2+20)*goarch.IsWasm + (2+20)*goos.IsIos*goarch.IsArm64

	// heapArenaBitmapWords is the size of each heap arena's bitmap in uintptrs.

		switch ctxt.BuildMode {
		case BuildModeCShared, BuildModeCArchive:
			*flagEntrySymbol = fmt.Sprintf("_rt0_%s_%s_lib", buildcfg.GOARCH, buildcfg.GOOS)
		case BuildModeExe, BuildModePIE:
			*flagEntrySymbol = fmt.Sprintf("_rt0_%s_%s", buildcfg.GOARCH, buildcfg.GOOS)
		case BuildModeShared, BuildModePlugin:
			// No *flagEntrySymbol for -buildmode=shared and plugin
		default:

	"runtime"
	"strings"
	"syscall"
	"testing"

	"github.com/google/uuid"
)

func TestCheckPathLength(t *testing.T) {
	// Check path length restrictions are not same on windows/darwin
	if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
		t.Skip()
	}

	testCases := []struct {
		path        string
		expectedErr error
	}{
		{".", errFileAccessDenied},
		{"/", errFileAccessDenied},
		{"..", errFileAccessDenied},

func diffCPUTime(t *testing.T, f func()) (user, system time.Duration) {
	if fn := diffCPUTimeImpl; fn != nil {
		return fn(f)
	}
	t.Fatalf("cannot measure CPU time on GOOS=%s GOARCH=%s", runtime.GOOS, runtime.GOARCH)
	return 0, 0
}

func contains(slice []string, s string) bool {
	for i := range slice {
		if slice[i] == s {
			return true
		}
	}
	return false
}