Debug dcu path

Question

Please provide me some details about debug dcu path and where it is used.

Answer 1

'Debug DCU Path' is a Borland Delphi option found under Tools > Debugger Options. It specifies the list of directories that, when the 'Debug DCUs' option is on, will be searched for debug versions of the Delphi Compiled Units used by your project.

Answer 2

Write the following line ...

procedure TFormMain.Button1Click(Sender: TObject);
begin
  ShowMessage('a');
end;

... and place a breakpoint (F5) at the ShowMessage() line.

After running the application, the debugger will stop at this line. Now press F7.

With the Use debug .dcus setting and a valid Debug DCU path (something like $(BDS)\lib\Debug, depends on your Delphi version) you will enter the ShowMessage procedure in Dialog.pas, without the setting you won't.