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#
# Licensed 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.
#
# Tries to find NCCL headers and libraries.
#
# Usage of this module as follows:
#
# find_package(NCCL)
#
# Variables used by this module, they can change the default behaviour and need
# to be set before calling find_package:
#
# NCCL_ROOT - When set, this path is inspected instead of standard library
# locations as the root of the NCCL installation.
# The environment variable NCCL_ROOT overrides this variable.
#
# This module defines
# Nccl_FOUND, whether nccl has been found
# NCCL_INCLUDE_DIR, directory containing header
# NCCL_LIBRARY, directory containing nccl library
# NCCL_LIB_NAME, nccl library name
# USE_NCCL_LIB_PATH, when set, NCCL_LIBRARY path is also inspected for the
# location of the nccl library. This would disable
# switching between static and shared.
#
# This module assumes that the user has already called find_package(CUDA)
if(NCCL_LIBRARY)
if(NOT USE_NCCL_LIB_PATH)
# Don't cache NCCL_LIBRARY to enable switching between static and shared.
unset(NCCL_LIBRARY CACHE)
endif()
endif()
if(BUILD_WITH_SHARED_NCCL)
# libnccl.so
set(NCCL_LIB_NAME nccl)
else()
# libnccl_static.a
set(NCCL_LIB_NAME nccl_static)
endif()
find_path(NCCL_INCLUDE_DIR
NAMES nccl.h
HINTS ${NCCL_ROOT}/include $ENV{NCCL_ROOT}/include)
if(USE_DLOPEN_NCCL)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Nccl DEFAULT_MSG NCCL_INCLUDE_DIR)
mark_as_advanced(NCCL_INCLUDE_DIR)
else()
find_library(NCCL_LIBRARY
NAMES ${NCCL_LIB_NAME}
HINTS ${NCCL_ROOT}/lib $ENV{NCCL_ROOT}/lib/)
message(STATUS "Using nccl library: ${NCCL_LIBRARY}")
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Nccl DEFAULT_MSG
NCCL_INCLUDE_DIR NCCL_LIBRARY)
mark_as_advanced(
NCCL_INCLUDE_DIR
NCCL_LIBRARY
)
endif()
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