89f930a7de
OpenMP has restrictions on directives allowed to be strictly nested
inside a
construct with the order(concurrent) clause specified.
- OpenMP 5.0, 5.1, and 5.2 allows: 'loop', 'parallel', 'simd', and
combined directives starting with 'parallel'.
- OpenMP 6.0 allows: the above directives plus 'atomic' and
all loop-transformation directives.
Furthermore, a region that corresponds to a construct with
order(concurrent)
specified may not contain calls to the OpenMP runtime API.
This PR fixes the following issues in the current implementation:
With -fopenmp-version=50: none of the nesting restrictions above were
enforced
With -fopenmp-version=60:
1. Clang did not reject OpenMP runtime APIs encountered in the region.
2. Clang erroneously rejected combined directives starting with
parallel.
---------
Co-authored-by: Zahira Ammarguellat <zahira.ammarguellat@intel.com>
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