Eclipse cannot be automatically compiled

Xiao xiaokun reinstalled the system, and it seems that he accidentallyEclipseThe disk is alsoFormat. I put myEclipseThe entire project is sent to him, but the original project cannot be automatically compiled. SetProjectOfBuild automaticallyCancel, and manual compilation will not work. Strange new projects can be automatically compiled.

solution: back up and delete projects that cannot be compiled. Create a project with the same name and import the original source file so that the project can be automatically compiled.