if err != nil {
		return err
	}
	for _, de := range dirents {
		switch de.Name() {
		case "bin", "pkg":
			// We already created GOROOT/bin and GOROOT/pkg above; skip those.
			continue
		}
		if err := adb("push", filepath.Join(goroot, de.Name()), path.Join(deviceGoroot, de.Name())); err != nil {
			return err
		}
	}

	if _, err := stat.WriteString(goVersion); err != nil {

	for _, test := range []struct {
		name string
		h    *Header
	}{{
		name: "name too long",
		h:    &Header{Name: strings.Repeat("a", maxSpecialFileSize)},
	}, {
		name: "linkname too long",
		h:    &Header{Linkname: strings.Repeat("a", maxSpecialFileSize)},
	}, {
		name: "uname too long",
		h:    &Header{Uname: strings.Repeat("a", maxSpecialFileSize)},
	}, {
		name: "gname too long",

	default:
		return nil, nil // Not a PAX format GNU sparse file.
	}
	hdr.Format.mayOnlyBe(FormatPAX)

	// Update hdr from GNU sparse PAX headers.
	if name := hdr.PAXRecords[paxGNUSparseName]; name != "" {
		hdr.Name = name
	}
	size := hdr.PAXRecords[paxGNUSparseSize]
	if size == "" {
		size = hdr.PAXRecords[paxGNUSparseRealSize]
	}
	if size != "" {
		n, err := strconv.ParseInt(size, 10, 64)

The same assembler is used for all target operating systems and architectures.
The GOOS and GOARCH environment variables set the desired target.

Flags:

	-D name[=value]
		Predefine symbol name with an optional simple value.
		Can be repeated to define multiple symbols.
	-I dir1 -I dir2
		Search for #include files in dir1, dir2, etc,
		after consulting $GOROOT/pkg/$GOOS_$GOARCH.
	-S

Instead, a separate tool, cgo, processes it to produce three output
files.  The first two, 6g.go and 6c.c, are a Go source file for 6g and
a C source file for 6c; both compile as part of the named package
(gmp, in this example).  The third, gcc.c, is a C source file for gcc;
it compiles into a shared object (.so) that is dynamically linked into
any 6.out that imports the first two files.

The stanza