Getting verbose message for cmake

McMartin · December 14, 2019, 4:54pm

NCCL_INCLUDE_DIRS and NCCL_LIBRARIES are result variables of calling find_package(nccl REQUIRED) :


# The following are set after configuration is done:
#  NCCL_FOUND
#  NCCL_INCLUDE_DIRS
#  NCCL_LIBRARIES

They are not inputs, and setting them as environment variables doesn’t change how Findnccl.cmake works.

The only environment variable that Findnccl.cmake reads is NCCL_ROOT_DIR:


set(NCCL_ROOT_DIR $ENV{NCCL_ROOT_DIR} CACHE PATH "Folder contains NVIDIA NCCL")

So I guess, you should set the environment variable NCCL_ROOT_DIR to /opt/nccl-2.4.8 to get it working.

I hope this helps!