[llvm-dev] llvm-lit output directory - role?

[alexp via llvm-dev]

Hi,
I use llvm-lit in my own project. Works fine so far.
However, executing the tests, I get output directories which are empty.
Whats the role of them? I could not find any hint in the docu.

I was expecting that e.g. for RUN: X, the output of X would be located
there.
I can use RUN: X > log, then I get a log file right besides the test
file, and not in oputput.

Where can I find more docu about the output directories?

Thx
Alex