Part II Compilation File (page 8)
Compilation file (page 8) Establish an application or package for the first time, the compiler will generate a compiled unit file for each unit file used in the project (Win32 is a .dcu extension, .NET is .dcuil extension); Engineering All compiled unit files are connected and created a unique executable or shared package. When creating a package file for the first time, the compiler creates a file for each unit file contained in the package, then create a .dcp and a package file. If you use a GD switch, the compiler generates an allocation diagram file and a .drc file, a .drc file containing a string resource, can be compiled into a resource file. When you build a project, the individual's unit cannot be compiled unless they are changed after the final compilation, their .dcu / .dpu file cannot be discovered, you clearly tell the compiler To recompile, or an interface of a unit file must rely on another unit file that has been changed. In fact, as long as the compiler can find the compiled unit file, or this unit file does not rely on another unit file that is changed, the source file of this unit does not have to exist.