https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101079
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- OpenMP language committee discussions aren't public, there will be soon an OpenMP 5.2 public draft though. The particular restriction under discussion is: "For a linear clause that appears on a loop-associated construct, the difference between the value of a list item at the end of a logical iteration and its value at the beginning of the logical iteration must be equal to linear-step."