cudaPackages.nccl: 2.27.6-1 -> 2.28.7-1; support earlier CUDA releases

# NOTE: Though NCCL is called within the cudaPackages package set, we avoid passing in

# the names of dependencies from that package set directly to avoid evaluation errors

# in the case redistributable packages are not available.

{

  _cuda,

  backendStdenv,

  cuda_cccl,

  cuda_cudart,

  cuda_nvcc,

  cudaAtLeast,

  cudaNamePrefix,

  fetchFromGitHub,

  flags,

let

  inherit (_cuda.lib) _mkMetaBadPlatforms;

  inherit (backendStdenv) hasJetsonCudaCapability requestedJetsonCudaCapabilities;

  inherit (lib) licenses maintainers teams;

  inherit (lib.attrsets)

  inherit (lib)

    all

    flip

    getAttr

    getBin

    getInclude

    getLib

    getOutput

    licenses

    maintainers

    optionalString

    teams

    versionAtLeast

    versionOlder

    ;

in

backendStdenv.mkDerivation (finalAttrs: {

  # NOTE: Depends on the CUDA package set, so use cudaNamePrefix.

  name = "${cudaNamePrefix}-${finalAttrs.pname}-${finalAttrs.version}";

  pname = "nccl";

  version = "2.27.6-1";

  # NOTE:

  #   Compilation errors resulting from newer versions of NCCL on older releases of CUDA seem to be caused (mostly)

  #   by differences in assumed version of CCCL: using a newer CCCL with an older release of CUDA can (sometimes) allow

  #   newer versions of NCCL than what we provide here.

  version =

    if cudaAtLeast "11.7" then

      "2.28.7-1"

    else if cudaAtLeast "11.6" then

      "2.26.6-1"

    else

      "2.25.1-1";

  src = fetchFromGitHub {

    owner = "NVIDIA";

    repo = "nccl";

    tag = "v${finalAttrs.version}";

    hash = "sha256-/BiLSZaBbVIqOfd8nQlgUJub0YR3SR4B93x2vZpkeiU=";

    hash = getAttr finalAttrs.version {

      "2.28.7-1" = "sha256-NM19OiBBGmv3cGoVoRLKSh9Y59hiDoei9NIrRnTqWeA=";

      "2.26.6-1" = "sha256-vkWMGXCy+dIpYCecdafmOAGlnfRxIQ5Y2ZQuMjinraI=";

      "2.25.1-1" = "sha256-3snh0xdL9I5BYqdbqdl+noizJoI38mZRVOJChgEE1I8=";

    };

  };

  outputs = [

  ];

  buildInputs = [

    (getOutput "include" cuda_nvcc)

    (getInclude cuda_nvcc)

    cuda_cccl

    cuda_cudart

  ];

      --replace-fail \

        '-ccbin $(CXX)' \

        ""

  ''

  # 2.27.3-1 was the first to introuce CXXSTD

  + optionalString (versionOlder finalAttrs.version "2.27.3-1") ''

    nixLog "patching $PWD/makefiles/common.mk to remove NVIDIA's std hardcoding"

    substituteInPlace ./makefiles/common.mk \

      --replace-fail \

        '-std=c++11' \

        '$(CXXSTD)'

  '';

  # TODO: This would likely break under cross; need to delineate between build and host packages.

  makeFlags = [

    "CXXSTD=-std=c++17"

    "CUDA_HOME=${getBin cuda_nvcc}"

    "CUDA_INC=${getOutput "include" cuda_cudart}/include"

    "CUDA_INC=${getInclude cuda_cudart}/include"

    "CUDA_LIB=${getLib cuda_cudart}/lib"

    "NVCC_GENCODE=${flags.gencodeString}"

    "PREFIX=$(out)"

  enableParallelBuilding = true;

  postFixup = ''

    moveToOutput lib/libnccl_static.a "$static"

    _overrideFirst outputStatic "static" "lib" "out"

    moveToOutput lib/libnccl_static.a "''${!outputStatic:?}"

  '';

  passthru = {

      {

        message = "Pre-Thor Jetson devices (CUDA capabilities < 10.1) are not supported by NCCL";

        assertion =

          !hasJetsonCudaCapability

          || lib.all (lib.flip lib.versionAtLeast "10.1") requestedJetsonCudaCapabilities;

          !hasJetsonCudaCapability || all (flip versionAtLeast "10.1") requestedJetsonCudaCapabilities;

      }

    ];