dexonsmith added a comment.

> No, the bot is also meant to catch changes to libc++ breaking LLDB (or at 
> least making sure we update the corresponding data formatters).



> Given that these tests are macOS specific and already require a specific SDK, 
> I'll just update them to use the compiler from the SDK instead of the 
> just-built one.

I'm not sure I'm totally following, but just want to double check that the 
tests won't somehow use the libc++ from the SDK instead of ToT? I guess the 
test uses `-nostdinc++` or something?

Assuming that's doing what we want... I also wanted to highlight this adds a 
dependency on bot's host clang working with the ToT libc++ headers. That's 
probably fine -- I assume we keep the bot's Xcode relatively up-to-date -- but 
I know @ldionne at some point was trying to avoid requiring new libc++ to work 
with older clangs.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D45639/new/

https://reviews.llvm.org/D45639

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