https://www.pgroup.com/resources/accel.htm#openmp says OpenMP 4.5 features are coming in 2018. Can you provide more details? A table might help.
I currently find that OpenMP target code will compile and run on a CPU with 17.4 on Mac, but presumably this is a no-op implementation. It does not work when I add collapse(2).
On the other hand, taskloop does not work in 17.4, which is consistent with the aforementioned summary.
A matrix of features and OS+HW support would really help users. Thanks.