engine-v5 is another cocos2d-x fork.

preprocessor: 
del: 
CC_STATIC

add:
_USRDLL
_USEGUIDLL
_USREXDLL
_EXPORT_DLL_

_USRSTUDIODLL

Refactor core & extensions libs
C++17

engine-v5-core.dll:
  renderer, audio, node tree
  1. Refactor audio engine, OpenAL for all platforms.
  2. Remove SimpleAudio
  3. Remove offthread file operation
  4. Remove getSutiableOpen
  5. Optimize CCDownloader, curl for all platforms
  7. Refactor engine-v5-deps, all compile as vs2019 14.22
  8. minizip-1.2.0 [done]
  9. ccMessageBox [done]
  10. BMP support with stb_image
  11. Remove unused libuv
  12. Reorder child support
  13. Remove tinyxml2 dep, use pugixml instead
  14. Use xsxml for SAX parser only
  15. Multi meta textures
  16. ProgramStateRegistry
  17. Optimize CCFileUtils
  18. ANGLE support.
  19. Use curl for HttpClient all platforms
  20. AES encrypt system
  21. Remove xxtea
  XX1. Cache ProgramState or use object_pool
  XX2. Remove socket.io
  XX2. Remove websockets
  XX4. Fully streaming play for all media file: .mp4, .mp3, .ogg, .wav
  XX5. Streaming load for .ttf with freetype2
  XX6. Remove CCB(already removed in v4)
  XX7. Purely offthread load texture, use shared gl context

engine-v5-ui.dll: The original v3-ui framework may remove in the future
engine-v5-ext.dll: old GUI ui(could be remove), physics-nodes, pu3d
engine-v5-ccs20.dll: x-studio
engine-v5-ccs21.dll: x-studio
engine-v5-xs.dll: x-studio

engine-v5-lua.lib:
  Lua53 compat
  Remvoe luasocket
  Use yasio as external lua/native tcp/udp/kcp support
  XX1: Use sol2 for binding framework instead tolua++

!!! Custom APK support, don't compress .mp4, .mp3, .ogg, .wav, .ttf

!!!! future of future, use bgfx for multi renderer backend support.