Qt Creator->菜单->帮助->关于插件->C+±>去掉ClangCodeModel
勾选->重启Qt Creator

参考:【问题解决】Qt Creator 报错:Clang Code Model: Error: The clangbackend executable_qt clang code model-CSDN博客
Qt Creator->菜单->帮助->关于插件->C+±>去掉ClangCodeModel
勾选->重启Qt Creator
参考:【问题解决】Qt Creator 报错:Clang Code Model: Error: The clangbackend executable_qt clang code model-CSDN博客