ldionne added inline comments.

================
Comment at: clang/www/hacking.html:295-296
+  directory will cause the update of the diff to start a CI run. This dummy
+  file will also add the libc++ group to the list of reviewers. The status of
+  the build will be available in Phabricator.</p>
+
----------------
philnik wrote:
> aaron.ballman wrote:
> > I am guessing the dummy file should then be removed before landing the 
> > commit and we should document that?
> > 
> > (FWIW, adding a dummy file feels really unclean as a design -- it's 
> > mysterious behavior for new contributors, which the documentation helps 
> > with a bit, but also it's a risk for checking in files that are never 
> > intended to be in the tree. If there's a way to improve this somehow so we 
> > don't need to trick the precommit CI into running, that would be really 
> > nice and totally outside of the scope of this review.)
> It would be great if just the bootstrapping build could be run on all clang 
> reviews. That should show most problems with changes in clang. If there are 
> any problems in libc++, fixing them would result in a full CI run. Having 
> libc++ run against the patch would probably also be awesome as a smoke test 
> for any clang changes.
I agree. Let's:

1. Setup a `buildkite-pipeline.yml` file that controls the jobs done for Clang. 
I think right now this is hardcoded somewhere in 
https://github.com/google/llvm-premerge-checks
2. Simply add `LLVM_ENABLE_RUNTIMES=libcxx` to the config that Clang uses so 
they'll automatically build libc++ with the Clang that was just built anyway. 
That would run on Clang's own agents that are used for Clang tests, not on the 
libc++ CI agents. We can adjust if running the libc++ tests causes too much 
strain on the infrastructure running Clang CI.

That way, a basic bootstrapping build of libc++ will be run on every Clang 
change, and TBH I think all of this added documentation for Clang folks to test 
libc++ changes can simply go away. There really wouldn't be a reason to ever 
add a `.DELETE_ME` file to libc++ for a Clang patch anymore.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D133249/new/

https://reviews.llvm.org/D133249

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