Re: -Wconversion versus libstdc++

[Paolo Carlini <pcarlini at suse dot de>]

Joe Buck wrote:

> Careful.  As you suggest, let's restrict ourselves to two's complement
> platforms.  I would want the compiler to warn if the identity holds for an
> ILP32 machine but not an LP64 machine, even if I'm running on an ILP32.
> But if the two types are going to be the same size everywhere (because one
> is the unsigned modifier of the other) then GCC should not complain.
Indeed, between Gaby's message to the audit trail and the one to gcc@, I 
had your very same doubt, then noticed that, in the -Wconversion 
documentation, the bits about signed -> unsigned are distinct from the 
bits about conversion to smaller type: we could simply leave the latter 
untouched.

Paolo.