Upgrade Spine
Steps
Clone source code of spine-runtimes
git clone https://github.com/EsotericSoftware/spine-runtimes.git
cd spine-runtimes
git checkout 3.8
Remove spine source code located in cocos2d-x
rm -rf cocos2d-x/cocos/editor-support/spine/*
Update to recent spine code
cp spine-runtimes/spine-cpp/spine-cpp/include/spine/* \
cocos2d-x/cocos/editor-support/spine/
cp spine-runtimes/spine-cpp/spine-cpp/src/spine/* \
cocos2d-x/cocos/editor-support/spine/
cp -r spine-runtimes/spine-cocos2dx/src/spine/* \
cocos2d-x/cocos/editor-support/spine/
Edit cocos2d-x/cocos/editor-support/spine/CMakeLists.txt
file(GLOB_RECURSE COCOS_SPINE_SRC
${CMAKE_CURRENT_LIST_DIR}/*.cpp
${CMAKE_CURRENT_LIST_DIR}/**/*.cpp
)
file(GLOB_RECURSE COCOS_SPINE_HEADER
${CMAKE_CURRENT_LIST_DIR}/*.h
${CMAKE_CURRENT_LIST_DIR}/**/*.h
)