Bug 63883 Cannot configure option for enabling/disabling exclusion filters or custom output folders on a per project basis
Build M9 JDT/Core supports setting enablement for exclusion patterns and custom output folders on a per project basis. This isn't surfaced in the UI. There is only a global flag in workspace preferences.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_non_externalized_strings.label"); 
		addComboBox(composite, label, PREF_PB_NON_EXTERNALIZED_STRINGS, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		
		gd= new GridData();
		gd.widthHint= fPixelConverter.convertWidthInCharsToPixels(6);
		
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_max_per_unit.label"); 
		Text text= addTextField(composite, label, PREF_PB_MAX_PER_UNIT, 0, 0);
		text.setTextLimit(6);
		text.setLayoutData(gd);
		return composite;
	}
	private Composite createUnusedCodeTabContent(TabFolder folder) {
		String[] errorWarningIgnore= new String[] { ERROR, WARNING, IGNORE };
		
		String[] errorWarningIgnoreLabels= new String[] {
			PreferencesMessages.getString("CompilerConfigurationBlock.error"),  
			PreferencesMessages.getString("CompilerConfigurationBlock.warning"), 
			PreferencesMessages.getString("CompilerConfigurationBlock.ignore") 
		};
		
		String[] enabledDisabled= new String[] { ENABLED, DISABLED };
		
		int nColumns= 3;
		
		GridLayout layout= new GridLayout();
		layout.numColumns= nColumns;
					
		Composite composite= new Composite(folder, SWT.NULL);
		composite.setLayout(layout);