[flang-commits] [flang] [Flang][OpenMP] Add OpenMP standards support doc (PR #132707)

[via flang-commits]

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+<!--===- docs/FortranStandardsSupport.md
+
+   Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+   See https://llvm.org/LICENSE.txt for license information.
+   SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+-->
+
+# Flang OpenMP Standards Support
+
+```{contents}
+---
+local:
+---
+```
+
+This document summarizes OpenMP standards support in Flang. The information is only provided as a guideline. The
+TODOs/Not Yet Implemented messages emitted by the compiler for unimplemented features should be treated as authoritative.
+As of March 2025, standards support is provided upto OpenMP 4.0. We are actively working towards supporting OpenMP 4.5, OpenMP 5.* and OpenMP 6.0.
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h-vetinari wrote:

Note that https://clang.llvm.org/docs/OpenMPSupport.html has split OpenMP support into C/C++ & Fortran already. Presumably it makes sense to either fully join those documents, or remove the Fortran side from the clang docs, and just add a reference to this document.

Also typo
```suggestion
As of March 2025, standards support is provided up to OpenMP 4.0. We are actively working towards supporting OpenMP 4.5, OpenMP 5.* and OpenMP 6.0.
```
>From the table below, OpenMP 4.0 support is not 100% complete yet, so maybe "up to" gives a wrong impression here; I'd read it as "4.0 support is fully implemented".


https://github.com/llvm/llvm-project/pull/132707