Can't create or build c++ project

UE 4 has some code that modern toolchains flag with warnings, but since the build has “warnings as errors” turned on by default, this causes the build to fail.

Three options:

  1. Switch to developing in Unreal Engine 5 instead (any particular reason why you’re still preferring 4?).
  2. Configure the build settings to suppress these warnings (see: https://forums.unrealengine.com/t/wdeprecated-builtins-error-when-trying-to-build-ue4-on-xcode-15-0-1 – I know that this issue was reported for Xcode but the solution should be the same as for you).
  3. Fix the errors in the Unreal Engine source and compile your own build of the engine (this is hard, especially given that 4.27 is now more than 3 years old so there’s less support out there for it if you get stuck).
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