[PATCH] D77670: [CUDA] Add partial support for recent CUDA versions.

Fri Aug 13 07:26:17 PDT 2021

Hahnfeld added a comment.
Herald added a subscriber: dexonsmith.
Herald added a project: LLVM.

@tra The split between `LATEST` and `LATEST_SUPPORTED` leads to very weird warning and error messages:

  clang-14: warning: unknown CUDA version: cuda.h: CUDA_VERSION=11040.; assuming the latest supported version 10.1 [-Wunknown-cuda-version]
  clang-14: error: cannot find libdevice for sm_20; provide path to different CUDA installation via '--cuda-path', or pass '-nocudalib' to build without linking with libdevice                                                                                                                    
  clang-14: error: GPU arch sm_20 is supported by CUDA versions between 7.0 and 8.0 (inclusive), but installation at /usr/local/cuda-11.4 is 11.2; use '--cuda-path' to specify a different CUDA install, pass a different GPU arch with '--cuda-gpu-arch', or pass '--no-cuda-version-check'

Clang is mentioning three different CUDA versions here: 11.4 is what I really have installed, 11.2 is `LATEST` and therefore the one returned by `getCudaVersion` or as the "last resort" in `CudaInstallationDetector`, and the first warning says that Clang assumes the latest supported version 10.1. As a developer looking into the code, I get that the first warning is about saying that 10.1 is the latest fully supported version in terms of features, but I think this is really confusing to users. Do you see a chance to improve this? (other than adding just 11.3 and 11.4 to the enumerations where we'll always run behind)

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77670/new/

https://reviews.llvm.org/D77670