openCL cmdstanr Windows error

[rok_cesnovar]

Thanks for the tag, I have been off for a few days intermittently and havent caught up with Discourse yet.

This is a known issue for 2.26.1 that is fixed on develop, but in the meantime you can run:

cmdstan_make_local(cpp_options = "CXXFLAGS += -fpermissive")
rebuild_cmdstan(cores = 4)

This was previously discussed in

Stan is not working on GPU in Linux

It seems that g++ 9.3.0 does not like something about our OpenCL backend in 2.26.1. Its fixed on develop but that obviously wont help you there. Run: cmdstan_make_local(cpp_options = "CXXFLAGS += -fpermissive") rebuild_cmdstan(cores = 4) and then try again. The other solution is to switch to using clang++ for now: cmdstan_make_local(cpp_options = "CXX = clang++") rebuild_cmdstan(cores = 4) Sorry for the inconvenience.