CUDA warnings in 4.6.0
mphoward opened this issue · comments
Description
Compiling the new release of HOOMD with CUDA enabled generates a ton of warnings from the BoxDim such as
hoomd-blue/hoomd/BoxDim.h(154): warning #20013-D: calling a constexpr __host__ function("operator[]") from a __host__ __device__ function("BoxDim") is not allowed. The experimental flag '--expt-relaxed-constexpr' can be used to allow this.
hoomd-blue/hoomd/BoxDim.h(155): warning #20015-D: calling a constexpr __host__ function from a __host__ __device__ function is not allowed. The experimental flag '--expt-relaxed-constexpr' can be used to allow this.
The reason for this seems to be the use of the host method [] from std::array inside a device constructor. As far as I know, this is actually OK to do because the contents of array aren't being modified. However, HOOMD should compile without warnings. A possible solution would be to make this constructor available only on the host if it isn't actually needed in device code. Another solution would be to force the caller to unpack the array themselves.
Script
This warning is produced by the GitHub Actions builds. See:
https://github.com/glotzerlab/hoomd-blue/actions/runs/8359002625/job/22881455368Input files
No response
Output
See above.Expected output
No warnings.
Platform
Linux
Installation method
Compiled from source
HOOMD-blue version
4.6.0
Python version
3.11.3