Why is nvlink warning me about lack of sm_20 (compute capability 2.0) object code?

Question

I'm working with CUDA 6.5 on a machine with a GTX Titan card (compute capability 3.5). I'm building my code with just -gencode=arch=compute_30,code=sm_30 -gencode=arch=compute_35,code=sm_35 - and when I link my binary, nvlink says:

nvlink warning : SM Arch ('sm_20') not found in '/local/eyalroz/src/foo/CMakeFiles/tester.dir/src/./tester_generated_main.cu.o'

Why is it warning me about that? Do I need sm_20 for something I'm not aware of? If it's merely about the lack of lower compute capability support, why not sm_10 as well? (Also, how do I turn off the warning, if it's gratuitous?)

Answer 1

The issue was identified in CUDA 6.5 and has been rectified I believe in CUDA 7.5. Using the latest version of CUDA should make those warnings go away.

Answer 2

Just ignore it

i'm on cuda RC8 and have the same issue:

nvlink warning : SM Arch ('sm_20') not found in 'cudainfo.o'

compile: /usr/local/cuda/bin/nvcc -g -O2 -Iyes/include -Iyes/include -I. -gencode arch=compute_35,code=sm_35 -rdc=true --ptxas-options=-v -I./compat/jansson -o cudainfo.o -c cudainfo.cu

$ nvcc --version nvcc: NVIDIA (R) Cuda compiler driver Copyright (c) 2005-2016 NVIDIA Corporation Built on Wed_May__4_21:01:56_CDT_2016 Cuda compilation tools, release 8.0, V8.0.26