------- Comment #8 from manu at gcc dot gnu dot org 2007-01-26 16:56 ------- (In reply to comment #7) > (In reply to comment #6) > > OK. I see now. This seems hard to fix, since it is exposing the current > > implementation of a conversion to bool. > > > > No, it's not the 'current implementation', its the way the C and C++ standards > say this has to happen. When arithmetic operators are applied to sub-int > sized > operands they are first converted to int (or unsigned int if they can't be > represented in int -- which is only the case when you have a machine where > sizeof(unsigned short) == sizeof(unsigned int), or something similar). >
I think I expressed myself badly. I meant that the warning is appropriate but the message is confusing because it is exposing that when doing bool x = ~b; we actually do bool x = (~b != 0); So an appropriate message would say something like: test.cpp:5: warning: '(bool) ~b' is always true But that is hard to achieve with the current implementation. Don't you agree? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8715
