Listing all the phony targets on one line is less easy to maintain.

```make
.PHONY: foo bar

foo:
	...

bar:
	...
```

Add "baz" target:

```diff
-.PHONY: foo bar
+.PHONY: foo bar baz

 foo:
 	...

 bar:
 	...
+
+baz:
+	...
```

Remove "bar" target:

```diff
-.PHONY: foo bar baz
+.PHONY: foo baz

 foo:
 	...

-bar:
-	...
-
 baz:
 	...
```