tree b4cb9258aee259dc3b9d7b7c0c5515f56c523d4e
parent 0f672c6aad22dde39a172ae0b5f0b76068008f30
author Elliott Hughes <enh@google.com> 1424545271 -0800
committer Elliott Hughes <enh@google.com> 1424545271 -0800

Turn on -Werror=implicit-function-declaration for x86-64.

Implicit function declarations are much more dangerous on LP64 because
sizeof(int) != sizeof(void*), so any function that returns a pointer will
lose its top bits, leading to relatively hard to debug crashes.

Change-Id: Ib2570326dde1b1cde09c63c9b4c973d741528ee2