Question on -fwrapv and -fwrapv-pointer

[Qing Zhao via Gcc-patches]

Hi,

I have several questions on these options:

1.are pointers treated as signed integers in general? (I thought that pointers 
are addresses to the memory, should be treated as unsigned integer…)
2. If Yes, why? 
3. why a separate option for pointesr -fwrapv-pointer in addition to -fwrapv if 
they are treated as signed integers?

Thanks for your help.

Qing