After persistently getting error : identifier "atomicAdd" is undefined, I've found the solution to be to compile with -arch sm_20 flag. But how to pass this compiler flag in VS 2010? I have tried like so under Project > Properties:
But this apparently has had no effect and the error persists - what am I doing wrong?
Many thanks.
You can select the options for the GPU Code Generation in this dialog:
In this case "compute_20" means that i am compiling for the virtual compute architecture 2.0 - virtual architecture influences the PTX generation stage.
The second part that comes after the coma is "sm_21".This influences the CUBIN generation stage. It defines the real GPU architecture i want to compile the PTX to.
You can find detailed description of the nvcc command line parameters that control the code generation here.
Go to the "Device" section under "CUDA C/C++". There, within "Code Generation" you can specify your sm_20. No need for the -arch.
Be aware that there's separate properties for both the project and .cu files. Apparently they get merged before compilation.
I'd gotten caught by this trying to specify GPUs for compute 3.0 & greater, but .cu properties had some leftover specifications for 1.0 & 2.0
来源：https://stackoverflow.com/questions/14411435/how-to-set-cuda-compiler-flags-in-visual-studio-2010