https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66424
--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- See C11 6.5.2.2#6 regarding when calls to unprototyped functions involve undefined behavior. Being able to represent the value is only relevant where the case is a mismatch of corresponding signed/unsigned types.
