kokkos: build kokkos in language mode

[JBludau]

Currently Kokkos is using a launcher, but we also have an option to be usable in the CUDA language mode.
I hope this makes things easier. Followup to #2172 and #2182

[JBludau]

@partouf I noticed that Kokkos does not show up for NVCC, I was thinking just ditching the compiler launcher and using the language mode would be easier here. But this is just a suggestion.

[partouf]

This has nothing to do with that. i'll investigate, but likely cause is gpu properties and/or gpu instance not updated

[partouf]

should be now live, please have a look

[JBludau]

@partouf it is selectable for NVCC but still shows 'Kokkos_Core.hpp' file not found

[partouf]

its not clear to me why its not working, ill have to debug locally

[partouf]

should now work, though i don't know how best to test it (getting some errors when trying to include etc)

[JBludau]

That would be a minimal reproducer: https://godbolt.org/z/83nY6EEEd
It still complains that the header is not found except for NVCC-13

[partouf]

That would be a minimal reproducer: https://godbolt.org/z/83nY6EEEd It still complains that the header is not found except for NVCC-13

It's among our 'less popular' compilers (because its newer) and so its automatic build will be performed on a Sunday.

[JBludau]

I just found out that the linker problems are related to the coda-driver (-lcuda), see https://godbolt.org/z/c49EzTKW6

[partouf]

this is the current driver installed on our gpu instances: https://github.com/compiler-explorer/infra/blob/main/setup-gpu-node.sh#L25

[JBludau]

this is the current driver installed on our gpu instances: https://github.com/compiler-explorer/infra/blob/main/setup-gpu-node.sh#L25

The driver itself is fine, it is just that it does not automatically get linked when adding the library. Similarly to other flags like -extended-lambda that Kokkos exports in its cmake config.
https://godbolt.org/z/c49EzTKW6 shows that if I add the flags manually, it compiles and can execute