https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90482
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- It's not obvious to me why this would have anything to do with the calling convention on SPARC 32-bit, which is very reasonable. For example, it's not like M68k where pointers and integers are passed differently.
