Xcode build error at -fobjc-weak flag

Background

When click Xcode project and upgrade the project config for old Xcode version, like manage auto release.

you will see this error on your message list.

clang: error: -fobjc-weak is not supported on the current deployment target

The reason is Xcode add new command line “CLANG_ENABLE_OBJC_WEAK = YES;”.

Resolve

Now remove it on Xcode config, and build it again.

“CLANG_ENABLE_OBJC_WEAK = YES;”