I've seen this asked before, but didn't see an answer. Well, the answer was "this is normal." It shouldn't be... Any idea how to avoid? I have a design where the outputs ARE driven, but I get these errors:

7. Executing CHECK pass (checking for obvious problems).                                                                              
checking module openram_testchip..                                                                                                     
Warning: Wire openram_testchip.\wmask1 [3] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask1 [2] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask1 [1] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask1 [0] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask0 [3] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask0 [2] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask0 [1] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\wmask0 [0] is used but has no driver.                                                                  
Warning: Wire openram_testchip.\web1 is used but has no driver.                                                                        
Warning: Wire openram_testchip.\web0 is used but has no driver.