[flang] [llvm] Revert "Revert "[flang][openmp] Adds Parser and Semantic Support for Interop Construct, and Init and Use Clauses."" (PR #132343)

[via llvm-commits]

swatheesh-mcw wrote:

> > I have added `%openmp_flags` on `Lower/OpenMP/Todo/inteorp-construct.f90`.
> > `Parser/OpenMP/interop-construct.f90` and `Semantics/OpenMP/interop-construct.f90` already has `-fopenmp` as a parameter in the command. But if you want me to add `%openmp_flags` instead of -fopenmp, happy to do so!
> > Thanks!
> 
> `-fopenmp` is not sufficient. `%openmp_flags` expands to the following:
> 
> ```
> # Determine if OpenMP runtime was built (enable OpenMP tests via REQUIRES in test file)
> if config.have_openmp_rtl:
>     config.available_features.add("openmp_runtime")
>     # For the enabled OpenMP tests, add a substitution that is needed in the tests to find
>     # the omp_lib.{h,mod} files, depending on whether the OpenMP runtime was built as a
>     # project or runtime.
>     if config.openmp_module_dir:
>         config.substitutions.append(
>             ("%openmp_flags", f"-fopenmp -J {config.openmp_module_dir}")
>         )
>     else:
>         config.substitutions.append(("%openmp_flags", "-fopenmp"))
> ```

Great! I will add the flag then. Thanks!

https://github.com/llvm/llvm-project/pull/132343