> I'd like to reignite the discussion connected with the following areas and
> give some update:
> • Removing MKL_USE_SINGLE_DYNAMIC_LIBRARY (mentioned in the 'Build Flags' RFC
> part)
> • Dynamically linking the OpenMP runtime library which is provided by the
> compiler/system (mentioned in the 'Build with OpenMP' & 'Interoperability
> OpenMP' part)
> • Having two runtime OpenMPs in the same process what resulted in the hang
> ('Interoperability OpenMP' part).
>
> I think that knowing the root-cause of the hang (described here: #18255) it's
> worth to reconsider leaving the MKL_USE_SINGLE_DYNAMIC_LIBRARY and using that
> SDL as the solution of the problem connected with local/global symbol lookup
> namespaces appeared (RTLD_GLOBAL/RTLD_LOCAL) that appeared in the runtime
> while linking all the dynamic libraries separately. Providing that the issue
> reported internally will be resolved.
>
> I've removed LLVM OpenMP as the start of the process of enabling compiler
> based OpenMP. Thus, compiling with GCC resulted in linking libgomp (GNU
> OpenMP). However, it caused some performance drop that needs to be
> investigated. (#20092).
The bug will be fixed in the next oneAPI release - 2021.3. Just after the
release I'll open the PR addressing this problem.
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