When a source file is created or moved out of <project folder>/src, the file is not compiled.
"Source location folder" setting is defined with 'project folder'/src by default. To add souce codes in other folders please follow the procedure below.
- Open "Paths and Symbols" dialog through the menu of "Project" -> "Properties",
then choose "C/C++ General" -> "Path and Symbols" in category tree.
- Select "Source Location" tab.
- Press [Add Folder...] button and browse for a new source file location. To specify 'project folder', please choose ".".