rccl.cmake

if(NOT WITH_ROCM)
  return()
endif()

# Now we don't support RCCL on windows
if(WIN32)
  return()
endif()

if(WITH_RCCL)
  set(RCCL_ROOT
      ${ROCM_PATH}/rccl
      CACHE PATH "RCCL ROOT")
  find_path(
    RCCL_INCLUDE_DIR rccl.h
    PATHS ${RCCL_ROOT} ${RCCL_ROOT}/include ${RCCL_ROOT}/local/include
          $ENV{RCCL_ROOT} $ENV{RCCL_ROOT}/include $ENV{RCCL_ROOT}/local/include
    NO_DEFAULT_PATH)

  file(READ ${RCCL_INCLUDE_DIR}/rccl.h RCCL_VERSION_FILE_CONTENTS)

  string(REGEX MATCH "define NCCL_VERSION_CODE +([0-9]+)" RCCL_VERSION
               "${RCCL_VERSION_FILE_CONTENTS}")
  string(REGEX REPLACE "define NCCL_VERSION_CODE +([0-9]+)" "\\1" RCCL_VERSION
                       "${RCCL_VERSION}")

  # 2604 for ROCM3.5 and 2708 for ROCM 3.9
  message(STATUS "Current RCCL header is ${RCCL_INCLUDE_DIR}/rccl.h. "
                 "Current RCCL version is v${RCCL_VERSION}. ")
endif()