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# Try to find NCCL
#
# 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 $ENV{NCCL_ROOT_DIR} CACHE PATH "Folder contains NVIDIA NCCL")
find_path(NCCL_INCLUDE_DIR
NAMES nccl.h
HINTS
${NCCL_INCLUDE_DIR}
${NCCL_ROOT_DIR}
${NCCL_ROOT_DIR}/include
${CUDA_TOOLKIT_ROOT_DIR}/include)
if ($ENV{USE_STATIC_NCCL})
message(STATUS "USE_STATIC_NCCL detected. Linking against static NCCL library")
set(NCCL_LIBNAME "libnccl_static.a")
else()
set(NCCL_LIBNAME "nccl")
endif()
find_library(NCCL_LIBRARY
NAMES ${NCCL_LIBNAME}
HINTS
${NCCL_LIB_DIR}
${NCCL_ROOT_DIR}
${NCCL_ROOT_DIR}/lib
${NCCL_ROOT_DIR}/lib/x86_64-linux-gnu
${NCCL_ROOT_DIR}/lib64
${CUDA_TOOLKIT_ROOT_DIR}/lib64)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(NCCL DEFAULT_MSG NCCL_INCLUDE_DIR NCCL_LIBRARY)
if (NCCL_FOUND)
set(NCCL_HEADER_FILE "${NCCL_INCLUDE_DIR}/nccl.h")
message(STATUS "Determining NCCL version from the header file: ${NCCL_HEADER_FILE}")
file (STRINGS ${NCCL_HEADER_FILE} NCCL_MAJOR_VERSION_DEFINED
REGEX "^[ \t]*#define[ \t]+NCCL_MAJOR[ \t]+[0-9]+.*$" LIMIT_COUNT 1)
if (NCCL_MAJOR_VERSION_DEFINED)
string (REGEX REPLACE "^[ \t]*#define[ \t]+NCCL_MAJOR[ \t]+" ""
NCCL_MAJOR_VERSION ${NCCL_MAJOR_VERSION_DEFINED})
message(STATUS "NCCL_MAJOR_VERSION: ${NCCL_MAJOR_VERSION}")
endif()
set(NCCL_INCLUDE_DIRS ${NCCL_INCLUDE_DIR})
set(NCCL_LIBRARIES ${NCCL_LIBRARY})
message(STATUS "Found NCCL (include: ${NCCL_INCLUDE_DIRS}, library: ${NCCL_LIBRARIES})")
mark_as_advanced(NCCL_ROOT_DIR NCCL_INCLUDE_DIRS NCCL_LIBRARIES)
endif()
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