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clang-13: OpenMP support broken when using CUDA #1755

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j-stephan opened this issue Jun 29, 2022 · 0 comments · Fixed by #1756
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clang-13: OpenMP support broken when using CUDA #1755

j-stephan opened this issue Jun 29, 2022 · 0 comments · Fixed by #1756
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Backend:CUDA Type:Bug

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Another bug uncovered by #1713. clang-13's default OpenMP support is broken when using CUDA:

/usr/lib/llvm-13/lib/clang/13.0.1/include/omp.h(487): error: function "omp_is_initial_device" has already been defined

This is related to clang-13 enabling OpenMP 5 by default; lowering the OpenMP version seems to silence this error. See this related issue on NVIDIA's issue tracker:

NVIDIA/cuda-samples#102
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OpenMP fixes for clang 13 j-stephan/alpaka
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