tree cbdf82be93d047e8169db61cc4569dc4ad14734d
parent 45592a39d3b00aee4d6bd70da669400017b7a5d8
author Urvang Joshi <urvang@google.com> 1468524828 -0700
committer Urvang Joshi <urvang@google.com> 1471908776 +0000

Add compiler warning flag -Wextra and fix related warnings.

Note: some of these warnings are enabled by a combination of -Wunused
(added earlier) and -Wextra.

Change-Id: I322a1366bd4fd6c0dec9e758c2d5e88e003b1cbf