[FEA]: Add support for `pathfinder.find_bitcode_lib("nccl_device")`

[rwgk]

xref: #1421 (comment)

Quoting from there:

Similar to NVSHMEM, the NCCL bitcode library resides in the lib/ directory (libnccl_device.bc for LLVM IR). We would like to get the bitcode library path in similar way by calling cuda_pathfinder.find_bitcode_lib("nccl", lib_type=LLVM) for NCCL.

[rwgk]

Hi @sb17v, sorry I'm getting to this only now.

I think this should be easy, and I already looked around while working on #1821 (nvshmem_device.bc), but I couldn't find any released libnccl_device.bc anywhere, even with help from Cursor.

I did find this:

smc120-0009.ipp2a2.colossus.nvidia.com:/wrk/clone/nccl $ git remote -v
origin  https://github.com/NVIDIA/nccl.git (fetch)
origin  git@github.com:NVIDIA/nccl.git (push)

smc120-0009.ipp2a2.colossus.nvidia.com:/wrk/clone/nccl $ git log -n 1
commit 49839dfde34086ee9aaf9a1c69ae3404f13773e7 (HEAD -> master, origin/master, origin/HEAD)
Author: Mark Santesson <msantesson@nvidia.com>
Date:   Fri Mar 20 23:27:52 2026 +0000

    contrib/nccl_ep updates

    Fix nccl_ep cuda shim to only get used for CUDA version below 13.1

    use __forceinline__ to enable nccl_ep compilation with CUDA 12.8

    Fix EP README Common Scenarios tables and tensor classifications

smc120-0009.ipp2a2.colossus.nvidia.com:/wrk/clone/nccl $ git grep libnccl_device.bc
bindings/ir/CMakeLists.txt:set(UNOPTIMIZED_BC ${OBJDIR}/libnccl_device.bc.unoptimized)
bindings/ir/CMakeLists.txt:set(OPTIMIZED_BC ${OBJDIR}/libnccl_device.bc.optimized)
bindings/ir/CMakeLists.txt:set(FINAL_BC ${LIBDIR}/libnccl_device.bc)
bindings/ir/Makefile:UNOPTIMIZED_BC := $(OBJDIR)/libnccl_device.bc.unoptimized
bindings/ir/Makefile:OPTIMIZED_BC := $(OBJDIR)/libnccl_device.bc.optimized
bindings/ir/Makefile:FINAL_BC := $(LIBDIR)/libnccl_device.bc

How do people usually install libnccl_device.bc?

• PyPI?
• Conda?
• Linux distro (e.g. apt)?
• tarball?

Could you please help with installation instructions? I think I can figure it out from there.