if err := syscall.Exec(os.Args[0], argv, os.Environ()); err != nil {
			t.Fatal(err)
		}
	}

	var cmds []*exec.Cmd
	defer func() {
		for _, cmd := range cmds {
			cmd.Process.Kill()
		}
	}()

	args := append(append([]string(nil), os.Args[1:]...), "-test.run=^Test18146$")
	for n := attempts; n > 0; n-- {
		cmd := exec.Command(os.Args[0], args...)

fail for reasons that are irrelevant when using external linking mode.

The final program will be a dynamic executable, so that cmd/link can avoid
needing to process arbitrary .o files. It only needs to process the .o
files generated from C files that cgo writes, and those are much more
limited in the ELF or other features that they use.

In essence, the _cgo_import.o file includes the extra linking

		if err != nil {
			// There are a surprising number of ways this
			// can error out on linux.  We've seen all of
			// the following, so treat any error here as
			// equivalent to the "process is gone":
			//    os.IsNotExist(err),
			//    "... : no such process",
			//    "... : bad file descriptor.
			continue
		}
		lines := strings.Split(string(d), "\n")
		for _, line := range lines {
			// Different kernel vintages pad differently.

// This is really an os package test but here for convenience.
func testSetEnv(t *testing.T) {
	if runtime.GOOS == "windows" {
		// Go uses SetEnvironmentVariable on windows. However,
		// C runtime takes a *copy* at process startup of the
		// OS environment, and stores it in environ/envp.
		// It is this copy that	getenv/putenv manipulate.
		t.Logf("skipping test")
		return
	}
	const key = "CGO_OS_TEST_KEY"

		t.Skipf("skipping on %s/%s: runtime does not permit SI_USER SIGSEGV", GOOS, GOARCH)
	}
	globalSkip(t)
	checkSignalForwardingTest(t)
	buildSignalForwardingTest(t)

	// We want to send the process a signal and see if it dies.
	// Normally the signal goes to the C thread, the Go signal
	// handler picks it up, sees that it is running in a C thread,
	// and the program dies. Unfortunately, occasionally the

	}
	word, cond = p.lex.Text(), ""
	operands = scratch[:0]
	// Zero or more comma-separated operands, one per loop.
	nesting := 0
	colon := -1
	for tok != '\n' && tok != ';' {
		// Process one operand.
		var items []lex.Token
		if cap(operands) > len(operands) {
			// Reuse scratch items slice.
			items = operands[:cap(operands)][len(operands)][:0]
		} else {
			items = make([]lex.Token, 0, 3)

		if platform == 'remote-ios':
			process.RemoteLaunch(args, env, None, None, None, None, 0, False, err)
			if not err.Success():
				sys.stderr.write("lldb: failed to launch remote process: %s\n" % (err))
				process.Kill()
				debugger.Terminate()
				sys.exit(1)
		run_program()

exitStatus = process.GetExitStatus()
exitDesc = process.GetExitDescription()
process.Kill()
debugger.Terminate()

	}

	if deadline, ok := t.Deadline(); ok {
		timeout := time.Until(deadline)
		timeout -= timeout / 10 // Leave 10% headroom for logging and cleanup.
		timer := time.AfterFunc(timeout, func() {
			cmd.Process.Signal(syscall.SIGQUIT)
		})
		defer timer.Stop()
	}

	if err := cmd.Wait(); err != nil {
		t.Fatalf("%v exited with %v\n%s", cmd, err, out)
	}
}

	// forcing cmd.Run to use another pipe and goroutine to pass
	// along stderr from adb.
	cmd.Stderr = struct{ io.Writer }{os.Stderr}
	err := cmd.Run()

	// Before we process err, flush any further output and get the exit code.
	exitCode, err2 := filter.Finish()

	if err != nil {
		return 0, fmt.Errorf("adb exec-out %s: %v", args, err)
	}
	return exitCode, err2
}

//
// The Header.Size does not reflect the size of any extended headers used.
// Thus, this function will read from the raw io.Reader to fetch extra headers.
// This method mutates blk in the process.
func (tr *Reader) readOldGNUSparseMap(hdr *Header, blk *block) (sparseDatas, error) {
	// Make sure that the input format is GNU.
	// Unfortunately, the STAR format also has a sparse header format that uses