tree 6d4112f7a7003d99f8da82d063a51c821c6cddf7
parent 0ce4806c51438160f55bd28f592af996ca588d88
author Wyatt Hepler <hepler@google.com> 1579131651 -0800
committer Wyatt Hepler <hepler@google.com> 1579203675 -0800

GN build: Override built-in targets

- Override built-in targets, which gives more flexibility than
  set_defaults.
- Provide the default C++ in the toolchain, which can be overridden by
  explicitly specifying a config on a target.
- Remove the C++17 default flags from public configs, since it is no
  longer needed.

Change-Id: If211bada971c46cef83909bf15811a4f2c1eb7fd