cause this problem is macOS 10.15.2 not the Xcode, wait apple update operation system! In addtion,this system version can cause the cpu's temperature very high with Xcode running a long time,and the fan keep running,not stop unless close the Xcode!
JakeChiu
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I also encountered this problem, this problem should be macOS10.5.2 caused by this system, I tried to install Xcode11.0 version, still have the problem, but I run this on MacOS10.14.6 Xcode11.0 is no problem, such as apple update system fix the bug, also don't know if you have met the Xcode run for a period of time can cause the CPU occupancy rate reached 100 +, in turn, and fan CPU temperature is high, this is all the macOS10.15.2 system itself, I guess Test. First of all, I can confirm that my computer configuration is ok. The new i9 processor with 16 "32gb memory is the best.