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Add compile-time check for issue 1720 (Cuda < 12.4.0 + C++20 + std::variant) #1722

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Merged
franzpoeschel merged 1 commit into from
Mar 14, 2025
Merged

Add compile-time check for issue 1720 (Cuda < 12.4.0 + C++20 + std::variant) #1722

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15 changes: 15 additions & 0 deletions include/openPMD/openPMD.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,21 @@
namespace openPMD
{}

#if defined(CUDA_VERSION) && !defined(OPENPMD_SKIP_CHECK_ISSUE_1720)
static_assert(__cplusplus < 202002L || CUDA_VERSION >= 12040, R"(
Cannot use the openPMD-api in C++20 projects under a Cuda version lower
than 12.4.0 due to a bug in the implementation of std::variant.
Further information at:
https://github.com/openPMD/openPMD-api/issues/1720
https://forums.developer.nvidia.com/t/nvcc-c-20-std-variant-complie-failed/270162/5
This cannot be fixed on our side, please either upgrade to CUDA >= 12.4.0
or use C++17.
If you think that this assertion is shown wrongly, please apply
'#define OPENPMD_SKIP_CHECK_ISSUE_1720' before including
'<openPMD/openPMD.hpp>'.
)");
#endif

// IWYU pragma: begin_exports
#include "openPMD/Dataset.hpp"
#include "openPMD/Datatype.hpp"
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