Build safety with -Wextra

Author: sshane

opendbc/safety/tests/common.py

@@ -862,7 +862,7 @@ def test_relay_malfunction(self):
         self.safety.set_relay_malfunction(False)
         self._rx(make_msg(bus, addr, 8))
         should_relay_malfunction = addr in self.RELAY_MALFUNCTION_ADDRS.get(bus, ())
-        self.assertEqual(should_relay_malfunction, self.safety.get_relay_malfunction(), (bus, addr))
+        self.assertEqual(should_relay_malfunction, self.safety.get_relay_malfunction(), (bus, hex(addr)))
 
     # test relay malfunction protection logic
     self.safety.set_relay_malfunction(True)

opendbc/safety/tests/libsafety/SConscript

@@ -11,6 +11,7 @@ env = Environment(
   CC=CC,
   CFLAGS=[
     '-Wall',
+    "-Wextra",
     '-Werror',
     '-nostdlib',
     '-fno-builtin',