[clang] [compiler-rt] [llvm] [clang][llvm][rtsan] Introduce RealtimeSanitizer clang codegen, llvm attributes (PR #100120)

[via llvm-commits]

davidtrevelyan wrote:

> Can we split into 3 patches?
> 
> 1. LLVM
> 2. Clang
> 3. Compiler-rt
> 
> And each patch should have tests

Thanks for the suggestion @vitalybuka - after some thought, we think we can remove the llvm changes entirely now, and so here's our plan:

1. close this PR soon (giving a little time for any interested parties to give feedback),
2. remove the LLVM changes,
3. open a PR for the Clang changes (using temporary stubs for `__rtsan_realtime_enter()` and `__rtsan_realtime_exit()`), and finally
4. follow this with a PR that ties it all end-to-end in compiler-rt.

Hope that all makes sense - please let us know if any alarm bells are ringing in your head. We will of course also sweep our patch for any missing test coverage. 

Thanks again!

 

https://github.com/llvm/llvm-project/pull/100120