runtime: skip tests that need fork on darwin/arm

Change-Id: I1bb0b8b11e8c7686b85657050fd7cf926afe4d29
Reviewed-on: https://go-review.googlesource.com/6200Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

src/runtime/crash_cgo_test.go

@@ -57,15 +57,17 @@ func TestCgoExternalThreadSIGPROF(t *testing.T) {
 	case "plan9", "windows":
 		t.Skipf("no pthreads on %s", runtime.GOOS)
 	case "darwin":
-		// static constructor needs external linking, but we don't support
-		// external linking on OS X 10.6.
-		out, err := exec.Command("uname", "-r").Output()
-		if err != nil {
-			t.Fatalf("uname -r failed: %v", err)
-		}
-		// OS X 10.6 == Darwin 10.x
-		if strings.HasPrefix(string(out), "10.") {
-			t.Skipf("no external linking on OS X 10.6")
+		if runtime.GOARCH != "arm" {
+			// static constructor needs external linking, but we don't support
+			// external linking on OS X 10.6.
+			out, err := exec.Command("uname", "-r").Output()
+			if err != nil {
+				t.Fatalf("uname -r failed: %v", err)
+			}
+			// OS X 10.6 == Darwin 10.x
+			if strings.HasPrefix(string(out), "10.") {
+				t.Skipf("no external linking on OS X 10.6")
+			}
 		}
 	}
 	if runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" {

src/runtime/crash_test.go

@@ -41,6 +41,10 @@ func executeTest(t *testing.T, templ string, data interface{}, extra ...string)
 	switch runtime.GOOS {
 	case "android", "nacl":
 		t.Skipf("skipping on %s", runtime.GOOS)
+	case "darwin":
+		if runtime.GOARCH == "arm" {
+			t.Skipf("skipping on %s/%s", runtime.GOOS, runtime.GOARCH)
+		}
 	}
 
 	checkStaleRuntime(t)