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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Find the nccl libraries
#
# The following variables are optionally searched for defaults
# NCCL_ROOT_DIR: Base directory where all NCCL components are found
# NCCL_INCLUDE_DIR: Directory where NCCL header is found
# NCCL_LIB_DIR: Directory where NCCL library is found
#
# The following are set after configuration is done:
# NCCL_FOUND
# NCCL_INCLUDE_DIRS
# NCCL_LIBRARIES
#
# The path hints include CUDA_TOOLKIT_ROOT_DIR seeing as some folks
# install NCCL in the same location as the CUDA toolkit.
# See https://github.com/caffe2/caffe2/issues/1601
set(NCCL_ROOT_DIR "" CACHE PATH "Folder contains NVIDIA NCCL")
find_path(NCCL_INCLUDE_DIRS
NAMES nccl.h
HINTS
${NCCL_INCLUDE_DIR}
${NCCL_ROOT_DIR}
${NCCL_ROOT_DIR}/include
${CUDA_TOOLKIT_ROOT_DIR}/include
$ENV{NCCL_DIR}/include
)
find_library(NCCL_LIBRARIES
NAMES nccl
HINTS
${NCCL_LIB_DIR}
${NCCL_ROOT_DIR}
${NCCL_ROOT_DIR}/lib
${NCCL_ROOT_DIR}/lib/x86_64-linux-gnu
${NCCL_ROOT_DIR}/lib64
${CUDA_TOOLKIT_ROOT_DIR}/lib64
$ENV{NCCL_DIR}/lib
)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(NCCL DEFAULT_MSG NCCL_INCLUDE_DIRS NCCL_LIBRARIES)
if(NCCL_FOUND)
message(STATUS "Found NCCL (include: ${NCCL_INCLUDE_DIRS}, library: ${NCCL_LIBRARIES})")
mark_as_advanced(NCCL_ROOT_DIR NCCL_INCLUDE_DIRS NCCL_LIBRARIES)
endif()