And don't forget: if a compiler option is not chosable as checkbox, you can add it manually in the projects build options in "Other options" tab, just by typing the whole parameter there.
Or you can create a compiler that always uses these special settings, by duplicating (and renaming) an existing one in "Setup -> Compiler and debugger" and permanetly (and global) fix the settings to your needs.
So you can create a strict ansi-compiler without the need to make the chjanges everytime you create a new project, or you can even use it for single-files without project, if you make your "special" compiler the default one ("Set as default" in "Setup -> Compiler and debugger").