DJ Delorie <[EMAIL PROTECTED]> writes: >> Does the following fix it? > > Nope, sorry. I was looking at this code in c-common.c, where the expr > is first created, but I don't know what that ends up calling: > > /* Create the sum or difference. */ > if (resultcode == MINUS_EXPR) > intop = fold_build1 (NEGATE_EXPR, sizetype, intop); > > ret = fold_build2 (POINTER_PLUS_EXPR, result_type, ptrop, intop); > > It's calling NEGATE on an unsigned type, which seems wrong to me.
NEGATE_EXPR on an unsigned type is fully defined. It's what you should get when you say "unsigned int i, j; ...; i = - j;". I think the problem you are facing may be that POINTER_PLUS_EXPR generally assumes that the right type to use to add to a pointer is sizetype. You may need to make it use a different type, though I'm not sure what that type should be in your case. Ian
