Xcode13.3 with unreal4.26.2 create c++ project error

Development Programming & Scripting C++
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Thanks, @yao_great and @valentegamedev !!

I had downgraded to Xcode 13.2.1 because of this. (Which also works.)

The problem is the “-Werror” argument. Simple things like variables being set but not used was causing the build to fail.