https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86631
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Sun, 22 Jul 2018, msebor at gcc dot gnu.org wrote: > In ILP32 it sets the limit for the warning to LLONG_MAX which is greater than > the value of PTRDIFF_MAX on the targer (the intended setting). Unless there > is a macro that on the hosts gives the corresponding limit it might be > necessary to either reserve a value as special (such as HOST_WIDE_INT_MAX), or > to enhance the option argument parser to recognize and interpret such macros > so > that Walloc-size-larger-than=PTRDIFF_MAX can be set in c.opt and interpreted > to > mean the same thing regardless of the target. Note that target PTRDIFF_MAX may depend on architecture-specific command-line options, so you'd need to make sure the initialization ordering is correct (target options processed and built-in types registered, so that it's possible to look up PTRDIFF_TYPE by name and so find out its max value).
