Pico multicore

Hi All,
Anyone doing stuff with both cores on the Pico? I just grabbed the Pico extension for Visual Code to poke it & see what it does, had an interesting first adventure. It does not seem to know anything about setting up a muticore project, so I had it generate a simple project that it did understand, just "example" level stuff, replaced the generated .c file with my own little test case...#include "pico/multicore.h" is not findable. So, looking at the generated compiler commands file, I added in a -I/home/.../include explicitly to see what happens. No change, still not found. hmm. Is there some magic caching going on here? Next, I added a -D for the multicore library,
still no change. Noticed that I had forgotten to add the pico_multicore lib to the CMakeLists.txt file and behold it builds now, no missing .h files. So my "solution" isn't really good for anything more than a casual kicking the tires thing, and I'd really appreciate it if sommeone could guide me a little on how to do this "right". Do I just have to wait for the VSCode extension to get smarter, or is there a better way to get those .h & .lib paths known to the compiler?
Thanks,
Bill