I posted my discussion of how OpenMP 4 is working on current Intel and gnu compilers at https://sites.google.com/site/tprincesi ... timization
based on tests of C, C++, Fortran (and combination with Cilk(tm) Plus) on Windows and linux.
Test cases at https://github.com/tprince/lcd
My "accelerator" testing is limited to Intel compilers for Intel(r) Xeon Phi(tm). The test cases all run in native mode. If there is demand I will post versions of the test suite for Fortran omp target, which began working with the current 15.0 release.
As far as I can see, OpenMP 4 has not (yet?) proven a popular replacement for proprietary OpenMP-like systems for "accelerators" in p target mode.