Whenever you click the Shift
+ F9
keys used to make a Build project, an Messages box is created where you can view the hint
and% with% of the project, whenever there are ERROR Delphi does not let the project run.
Example with Hint :

ExamplewithWarning:

Asmentionedby@JuniorMoreiratoedittheHintandWarningtoappearjustgotoTabProject->Options->DelphiCompiler->HintsandWarnings.

YoucanalsomakeaBuildprojectbyclickingTabProject->BuildProject.
EDIT1:
Theonlyavailableoptionstochoosefromarewarning
orTRUE
inthecaseofOutputsHintsasyoucanseeintheimagebelow: 
UnliketheOutputWarningsthatcanhavetheoptionFALSE
youcanchecktheimagebelow: