OpenCL apparently stuck at compiling vectorAdd example

Based on the log, it seems the compilation is still ongoing until you kill it. Compilations can take up to 12 hours for Arria 10, but they should be much faster for Cyclone boards. I recommend updating to the latest v17.0.2 and retrying. Also make sure you use the design files from this link (https://www.altera.com/support/support-resources/design-examples/design-software/opencl/vector-addition.html). You can also add -v --report to your compilation command to get more verbose output in stdout.