Add status message when nvtx connectors are not built

[cwpearson]

We had a user who wasn't getting the nvtx connector built as expected. This may help clarify what's going on in the future.

[cwpearson]

#281 should fix the simple build failure.

[masterleinad]

Would you mind adding similar messages for all the other tools?

[vlkale]

Would you mind adding similar messages for all the other tools?

I assume you mean for all the other third-party library connector tools in Kokkos Tools? It doesn't make sense for the in-house tools in Kokkos Tools, e.g., SpaceTimeStack, right?

For this PR, maybe we do just VTune connector, roctx connector, and nvtx connector. I think handling a tool like the APEX Kokkos Tools connector may be slightly more complicated.

I see that the roctx connector is handled now too in this PR.

[masterleinad]

The ones I noticed missing are VTune and Variorum since they also don't have a CMake option. It might be a good idea to just have a CMake option for everything but that can clearly be a different pull request.

[vlkale]

The ones I noticed missing are VTune and Variorum since they also don't have a CMake option. It might be a good idea to just have a CMake option for everything but that can clearly be a different pull request.

Got it, that makes sense then - and I think for this PR, it should just be ensured the CMake logic for each of the connectors consistent with each other, as @dalg24 commented.

Thanks @cwpearson for looking at this!

[dalg24]

I feel like that the message is potentially confusing, I would do just

Suggested change

	message(STATUS "Skipping nvtx-connector: NVTX is not enabled (maybe Kokkos was not found, or not configured with the CUDA backend)")
	message(STATUS "Skipping nvtx-connector (NVTX disabled)")