JDevlieghere marked an inline comment as done.
JDevlieghere added a comment.

In D66327#1632684 <https://reviews.llvm.org/D66327#1632684>, @labath wrote:

> How do you envision this to be used? Via something like 
> `CCC_OVERRIDE_OPTIONS=foo ninja check-lldb` ?
>
> Overall, I think it would be nice to avoid the tests being affected by the 
> inherited environment variables because that opens the door for tests to 
> unexpectedly fail or simply behave differently just because someone happens 
> to have some weird environment variable set (and he may not even know about 
> it). I think this is also consistent with the aproach taken in llvm (see e.g. 
> `possibly_dangerous_env_vars` in `llvm/utils/lit/lit/llvm/config.py`). 
> Overall, being able to run the (dotest) test suite with different options 
> would be nice, but I think it would be better if there was a more explicit 
> way to do that (e.g., a command line argument). Incidentally, `dotest` 
> already has a command line argument (`--env`), which seems to be exactly 
> intended for its purpose. Couldn't you just use that?


I considered this, and the reason I didn't go with that approach is because of 
how the builder gets it arguments: they're already passed through the 
environment. Given that `CCC_OVERRIDE_OPTIONS` is special in that it is 
consumed through the environment, I felt like this warranted just forwarding it.

I think passing the `--env` flags to the builder would be good, but it's going 
to be messy unless we move away from passing everything to the builder in the 
environment.

> (Also, instead of CCC_OVERRIDE_OPTIONS, I think I'd try to use CFLAGS_EXTRAS, 
> because that explicitly handled by makefiles, and so it gives an easier way 
> for tests to opt-out of this when they want very specific flags for something)

They're not exactly the same, `CCC_OVERRIDE_OPTIONS` allows you to do cool 
stuff like `'s/-g(lldb)?$/-gdwarf-5/'`. I want to use it on our matrix bot to 
check against different DWARF versions. The old bot was creating a wrapper 
around clang that set the `CCC_OVERRIDE_OPTIONS` and changes out the test 
compiler, but this would be a lot easier.



================
Comment at: lldb/packages/Python/lldbsuite/test/plugins/builder_base.py:39
 
+def getEnv():
+    """Returns the build environment."""
----------------
labath wrote:
> I am confused. How is this function used and what's its relation the the 
> second change below?
I uploaded a slightly outdated patch, the function below should call `getEnv`. 


Repository:
  rLLDB LLDB

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66327/new/

https://reviews.llvm.org/D66327



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