Installation error: Unknown option '-fopenmp'

[skanti]

Describe the bug
Hi Chris,
when building from source thru python setup.py install I get following error message:

nvcc fatal   : Unknown option '-fopenmp'

Any idea how come? I tried gcc8.4.0 and also few lower CUDA version but with the same outcome.

To Reproduce
python setup.py install

Expected behavior

'-fopenmp' should be known

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Python version: 1.8.0 (nightly)
• CUDA version: 11.2
• NVIDIA Driver version: 460.32.03
• Minkowski Engine version 0.5.0
• GCC version: 9.3.0

[chrischoy]

Hi Armen,

Could you try pytorch 1.7?
I'm using the default pytorch c extension for compilation and do not provide -fopenmp for nvcc compilation arguments.
It seems that pytorch 1.8 is adding the -fopenmp without -Xcompiler, which is possibly the reason why you are getting this error.

[skanti]

The error can be fixed when passing -Xcompiler -fopenmp to nvcc in setup.py. Perhaps newer pytorch versions omit -Xcompiler

[plusk01]

use ninja - see #208

[eusansone-dev]

Thank you so much!! Adding -Xcompiler -fopenmp to nvcc, that really works!!

[thesby]

Thank you so much!! Adding -Xcompiler -fopenmp to nvcc, that really works!!

Where should I add this line?

[Xavier-wa]

Thank you so much!! Adding -Xcompiler -fopenmp to nvcc, that really works!!

Could you show me how to add it plz @eusansone-dev

[Zimiao1025]

Update cmake to v3.22.5 available for me