clang: error: unable to execute

最近遇到一个问题有点困扰：

clang: error: unable to execute command: Killed: 9
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Apple clang version 11.0.0 (clang-1100.0.33.16)
Target: arm64-apple-ios8.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
clang: note: diagnostic msg: PLEASE submit a bug report to http://developer.apple.com/bugreporter/ and include the crash backtrace, preprocessed source, and associated run script.
clang: error: unable to execute command: Killed: 9
clang: note: diagnostic msg: Error generating preprocessed source(s).

DF1FB7AE-ED6F-4D80-8B18-3973AC101024.png