I tried to build Marlin 2.0.x with Arduino 1.18.12 on my Mac. After 4 hours of compiling, I gave up. No other software that I have built with Arduino has taken more than 2 minutes. During the build, the CPU load kept oscillating between something normal, like 20% and something ridiculous, like 600%. A google search showed a lot of people having this type of issue, but I couldn't find any solutions. A youtube video I saw suggested that it is now necessary to use a Microsoft compiler to build Marlin 2.0.x. Is that true, or are the issues I'm seeing a bug in Arduino, or some craziness with my computer?
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