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[OpenMP] Document how to specify flags to device libraries (#159053)

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Add an explanation on how to use RUNTIMES_<triple>_CMAKE_CXX_FLAGS in
order to specify different compiler flags for OpenMP device libraries.
This commit is contained in:
Tulio Magno Quites Machado Filho
2025-09-16 18:48:26 -03:00
committed by GitHub
parent 22625538cb
commit 66524ee7d0
1 changed files with 4 additions and 2 deletions
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openmp/docs/SupportAndFAQ.rst
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@@ -82,8 +82,10 @@ Support for the device library comes from a separate build of the OpenMP library
that targets the GPU architecture. Building it requires enabling the runtime
targets, or setting the target manually when doing a standalone build. This is
done with the ``LLVM_RUNTIME_TARGETS`` option and then enabling the OpenMP
runtime for the GPU target. ``RUNTIMES_<triple>_LLVM_ENABLE_RUNTIMES``. Refer to
the cache file for the specific invocation.
runtime for the GPU target via ``RUNTIMES_<triple>_LLVM_ENABLE_RUNTIMES``.
It's possible to set different flags for each device library by using
``RUNTIMES_<triple>_CMAKE_CXX_FLAGS``. Refer to the cache file for the specific
invocation.
For Nvidia offload, please see :ref:`build_nvidia_offload_capable_compiler`.
For AMDGPU offload, please see :ref:`build_amdgpu_offload_capable_compiler`.