Re: Making --with-wide-int the default

[Paul Eggert]

On 11/15/2015 08:01 AM, David Kastrup wrote:
> I can tell, and
>
> git grep XINT
>
> shows lots of assignments to variables of type int rather than
> EMACS_INT.  I think that there should be macros XINT, XUINT, XEINT (for
> EMACS_INT) which trigger a range error when the value does not fit the
> respective range.  Possibly also XLONG and XULONG but I'm not sure we
> actually have platforms where long/int are different.

There's no need XEINT etc., as this work has already been done, using 
macros like CHECK_TYPE_RANGED_INTEGER to make sure that XINT returns 
values in range for a C integer type.  Also, I sometimes build Emacs 
with C integer overflow checking enabled, and it runs fine.

Really, integer overflow is not a significant problem with 
--with-wide-int.  As Eli says, if it were a problem it'd also be a 
problem with 64-bit platforms, which it's not.