Tom Finegan f47cbd50e9 cmake: Move cxx flag testing/setup into its own file.
- Move CXX flags stuff into build/cxx_flags.cmake.
- include CMake modules where they're used.
- Add ENABLE_WERROR flag-- enables warnings as errors.
- Add -Wshorten-64-to-32 and -Wnarrowing to CXX flags.

Change-Id: I5d93a39a3eff6ae81f9e094927b8f0cb9f36bbb0
2016-04-07 14:49:26 -07:00
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