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Yeah, I agree.

You see, this isn't my code, I'm just making it work with a new compiler.
So I guess my question then becomes, is:
(int)c_a += sizeof(whatever);

equivalent to:
c_a +=...

Before I ask my question, here is a declaration:
unsigned char *c_a

Now I have this line:
(int)c_a += sizeof(whatever);

which used to work with an older compiler, but my new compiler...