[Bug middle-end/102972] [OpenMP] Strictly-nested diagnostic missing

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102972

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Created attachment 51688
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51688&action=edit
Draft patch

Patch works – but causes quite some fails in testsuites (at least in
https://github.com/clang-ykt/omptests).

Thus, I wonder whether it is (a) correct and, even if so, (b) it should be just
a warning? Or a downgradable error? I don't care about testsuites, but I fear
that it might also affect real-world code.