Warning message from gcc 6

I get this warning on compiling blead with the latest g++:


attributes.xs: In function ‘int modify_SV_attributes(PerlInterpreter*, 
SV*, SV**, SV**, int)’:
attributes.xs:67:110: warning: logical not is only applied to the left 
hand side of comparison [-Wlogical-not-parentheses]
      && !CvLVALUE(MUTABLE_CV(sv)) != negated;

• Warning message from gcc 6 by Karl Williamson