I just merged some changes that modify include-what-you-use (IWYU) to run against the libc++ in thirdparty rather than against the system's libstdc++. Coupled with some other changes, I expect that running IWYU on any Linux system should yield the exact same set of recommendations as when IWYU is run during a precommit build. Ideally, we'll achieve this determinism on macOS too, but for now I don't expect that to be the case.
As a reminder, you can run IWYU locally via "make iwyu" (or "ninja iwyu"), and you can have it automatically perform fixes via "make iwyu-fix" (or "ninja iwyu-fix"). If you do see any deviation between local and precommit IWYU behavior, please reply to this thread, or let me know directly.
