CPU G3900:
m1@m1-desktop:~$ ./ccminer --help
*** ccminer alexis-1.0 palgin skunkmod for nVidia GPUs from alexis78@github ***
*** Built with the nVidia CUDA Toolkit 8.0 (Not recommended prefer 7.5)
*** Based on tpruvot@github ccminer
*** Originally based on Christian Buchner and Christian H. project
*** Include some of the work of djm34, sp, tsiv and klausT.
*** Skunk algo modded by palgin
Illegal instruction
Same issue here. I had the same problem when I compiled tpruvot's ccminer on my main computer and tried to run it on a G3900. I fixed it by removing the "-march=native" option from the Makefile.
It's less optimized, but I don't think it impacts hashing speed since it's not related to cuda, right ?