differ in signdness warnings.

[Jan D.]

Hello.

With gcc >= 4.0 I get a lot of these when compiling Emacs:

coding.c:3471: varning: pointer targets in passing argument 1 of 
"safe_bcopy" differ in signedness

coding.c:3471: varning: pointer targets in passing argument 2 of 
"safe_bcopy" differ in signedness

frame.c:2107: varning: pointer targets in passing argument 1 of 
"strncmp" differ in signedness

and so on.

Is there anything said about what to do about these?  Should we ignore 
them or add casts where appropriate?  Introducing a SSDATA, which is 
(char *)SDATA, would be a good idea.

   Jan D.