Latest CUDA versions for various Mac OS X versions:

Mac OS X 10.4 - N/A
Mac OS X 10.5 - CUDA 3.2
Mac OS X 10.6 - CUDA 4.2
Mac OS X 10.7 - CUDA 5.5
Mac OS X 10.8 - CUDA 6.5
Mac OS X 10.9 - CUDA 7.5
Mac OS X 10.10 - CUDA 7.5
Mac OS X 10.11 - CUDA 8.0
Mac OS X 10.12 - CUDA 9.0
Mac OS X 10.13 - CUDA 10.2
Mac OS X 10.14+ - N/A

# [Extra flags for CC>5.x https://www.mersenneforum.org/showpost.php?p=621491&postcount=3598]
NVCCFLAGS += --generate-code arch=compute_61,code=sm_61
NVCCFLAGS += --generate-code arch=compute_75,code=sm_75
NVCCFLAGS += --generate-code arch=compute_86,code=sm_86
NVCCFLAGS += --generate-code arch=compute_89,code=sm_89
NVCCFLAGS += --generate-code arch=compute_90,code=sm_90