tree 589ad2a37c64cbde54e8e28006ad4393a7a5cd21
parent 5305d5aa1a6900c64a5833176b43a21acb13fb30
author Raul Tambre <raul@tambre.ee> 1639910998 +0200
committer Raul Tambre <raul@tambre.ee> 1643732720 +0200

CUDA: Generic all and all-major support

Commit 14d8a276 (CUDA: Support nvcc 11.5 new -arch=all|all-major flags,
2021-08-17) added all and all-major options to CUDA_ARCHITECTURES. These are
fairly generic and likely to see real-world use by distributors. Thus it's
desirable to support these also for Clang and older NVCC versions.

The supported architectures are dependent on the toolkit version. We determine
the toolkit version prior to compiler detection. For NVCC we get the version
from the vendor identification output, but for Clang we need to invoke NVCC
separately.

The architecture information is mostly based on the Wikipedia list with the
earliest supported version being CUDA 7.0. This could be documented and
expanded in the future to allow projects to query CUDA toolkit version and
architecture information.
For Clang we additionally constrain based on its support.

Additionally the architecture mismatch detection logic is fixed, improved and
updated for generic support:
* Commit 01428c55 (CUDA: Fail fast if CMAKE_CUDA_ARCHITECTURES doesn't work
  during detection, 2020-08-29) enabled CMAKE_CUDA_COMPILER_ID_REQUIRE_SUCCESS
  if CMAKE_CUDA_ARCHITECTURES is specified. This results in
  CMakeDetermineCompilerID.cmake printing the compiler error and our code for
  presenting the mismatch in a user-friendly way being useless. The custom
  logic seems preferable so go back to not enabling it.
* Commit 14d8a276 (CUDA: Support nvcc 11.5 new -arch=all|all-major flags,
  2021-08-17) tried to support CMP0054 but forgot to add x to the interpolated
  result. Thus the conditions would always evaluate to false. This is fixed as
  a byproduct of removing NVIDIA specific checks, improving the error message
  and replacing architectures_mode with a simpler architectures_explicit.

Visual Studio support omits testing the flags during detection due to
complexities in determining the toolkit version when using it.
A long-term proper implementation would be #23161.

Implements #22860.