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
addComboBox(group, label, PREF_COMPLIANCE, values34, values34Labels, 0);	
		label= PreferencesMessages.getString("CompilerConfigurationBlock.default_settings.label"); 
		addCheckBox(group, label, INTR_DEFAULT_COMPLIANCE, new String[] { DEFAULT_CONF, USER_CONF }, 0);	
		int indent= fPixelConverter.convertWidthInCharsToPixels(2);
		Control[] otherChildren= group.getChildren();	
				
		String[] values14, values14Labels;
		if (JavaModelUtil.isJDTCore_1_5()) {
			values14= new String[] { VERSION_1_1, VERSION_1_2, VERSION_1_3, VERSION_1_4, VERSION_1_5 };
			values14Labels= new String[] {
				PreferencesMessages.getString("CompilerConfigurationBlock.version11"),  
				PreferencesMessages.getString("CompilerConfigurationBlock.version12"), 
				PreferencesMessages.getString("CompilerConfigurationBlock.version13"), 
				PreferencesMessages.getString("CompilerConfigurationBlock.version14"), 
				PreferencesMessages.getString("CompilerConfigurationBlock.version15") 
			};
		} else {
			values14= new String[] { VERSION_1_1, VERSION_1_2, VERSION_1_3, VERSION_1_4 };
			values14Labels= new String[] {
				PreferencesMessages.getString("CompilerConfigurationBlock.version11"),  
				PreferencesMessages.getString("CompilerConfigurationBlock.version12"), 
				PreferencesMessages.getString("CompilerConfigurationBlock.version13"), 
				PreferencesMessages.getString("CompilerConfigurationBlock.version14") 
			};
		}
		
		label= PreferencesMessages.getString("CompilerConfigurationBlock.codegen_targetplatform.label"); 
		addComboBox(group, label, PREF_CODEGEN_TARGET_PLATFORM, values14, values14Labels, indent);	
		label= PreferencesMessages.getString("CompilerConfigurationBlock.source_compatibility.label"); 
		addComboBox(group, label, PREF_SOURCE_COMPATIBILITY, values34, values34Labels, indent);