The IDE automatically saves all your changed resources before you do a manual build.
            
            
         
         
         
          To disable the auto save feature: 
         
         
         
            - 
               From the main menu, select .
               
            
 
            - 
               In the left pane, expand General, and then select
                  Workspace. 
               
               
               

               
               
               
             
            - 
               In the right pane, disable the Save automatically before
                     build option.
               
            
 
            - 
               Click OK to save and apply your preferences.
               
            
 
         
         
         
         The IDE no longer saves your resources before it builds your project.