Qt linux 下 variable has incomplete type ‘QApplication‘

报这个variable has incomplete type ‘QApplication’ 错，但是代码的编译可以正常编译。
我的环境是：linux + qt5.12

图片找不到，类似于

安装如下：
apt-get install libclang-common-8-dev

重新打开qt就好了

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qtcreator: Clang code model fail to find stddef.h if libclang-common-8-dev package is not installed
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952718

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https://qa.1r1g.com/sf/ask/4241420361/

开启、禁用ClangCodeModel插件。
https://blog.youkuaiyun.com/lhw978/article/details/89923320/