misc/cgo/testshared: do not capture output of go commands in verbose mode

Change-Id: I8694ee5e5642c31815ae63cd414a3b1fcd9c95b0
Reviewed-on: https://go-review.googlesource.com/10411Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

misc/cgo/testshared/shared_test.go

@@ -47,10 +47,17 @@ func goCmd(t *testing.T, args ...string) {
 	}
 	newargs = append(newargs, args[1:]...)
 	c := exec.Command("go", newargs...)
+	var output []byte
+	var err error
 	if testing.Verbose() {
 		fmt.Printf("+ go %s\n", strings.Join(newargs, " "))
+		c.Stdout = os.Stdout
+		c.Stderr = os.Stderr
+		err = c.Run()
+	} else {
+		output, err = c.CombinedOutput()
 	}
-	if output, err := c.CombinedOutput(); err != nil {
+	if err != nil {
 		if t != nil {
 			t.Errorf("executing %s failed %v:\n%s", strings.Join(c.Args, " "), err, output)
 		} else {