Hmm, think these warnings can be ignored. Please feel free to upstream fixes if you’d like! 
What subset are you interested in? You could always disable e.g. the OpenCL and/or CPU backends when you build, in order to build/test a bit less, e.g. via -DGLOW_WITH_CPU=OFF -DGLOW_WITH_OPENCL=OFF when you run cmake. But not sure how you’re using Glow/if that helps you at all.