Qt:warning: The build directory is not at the same level as the source directory

-1: warning: The build directory is not at the same level as the source directory, which could be the reason for the build failure. 在Qt重新打开一个项目时，各种报错，最后一个提示如上。 参考了https://blog.csdn.net/neuq_jtxw007/ar

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