After upgraded to Xcode 12, I got a long list of warnings for my iOS project:
....... duplicate symbol 'kNOSAppKey' in: /Users/muyexi/Library/Developer/Xcode/DerivedData/sogoke-dioeogsoxykhoidzjsngkyqhivhm/Build/Intermediates.noindex/sogoke.build/Debug-iphonesimulator/sogoke.build/Objects-normal/x86_64/JSONDataModel.o ld: 1028 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
const value was defined in
AppConfig.h, and it's imported by
JSONDataModel. Moving it into the
.m file resolved this issue.