[FEA] Support all CTK-supported SM arches in cuda_init_architectures

[alliepiper]

Is your feature request related to a problem? Please describe.

Thrust supports all architectures supported by CTK, including deprecated ones. This means we currently need to build against SM35+ in our benchmarking library.

However, rapids_cuda_init_architectures only adds architectures supported by RAPIDS (sm60+) when CMAKE_CUDA_ARCHITECTURES=ALL.

Describe the solution you'd like

Ideally, these special values would be something like:

• ALL: non deprecated arches supported by CTK (e.g. sm53+)
• ALL_LEGACY: all arches supported by CTK, including deprecated (e.g. sm35+)
• RAPIDS: all arches supported by RAPIDS (e.g. sm60+)

Since the current convention around ALL is already in use by rapids-cmake users, maybe the following values would be more agreeable and less disruptive:

• CTK: non deprecated arches supported by CTK (e.g. sm53+)
• CTK_LEGACY: all arches supported by CTK, including deprecated (e.g. sm35+)
• ALL / RAPIDS: all arches supported by RAPIDS (e.g. sm60+)

Also -- I'm not sure if NATIVE will add <sm60 if such a card is present. If not, adding NATIVE_CTK + NATIVE_CTK_LEGACY (or similar) would be useful for us.

Describe alternatives you've considered

We can still just list all arches explicitly, so this is a low-priority issue with an easy workaround. Most users will want NATIVE anyway.

[robertmaynard]

Closing this issue as #314 better represents what rapids-cmake will do.

If you need to build with against all support archs, using the new CMAKE_CUDA_ARCHITECTURES=all/all-major is the best approach.