https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60846
--- Comment #9 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Note that supporting on any given 32-bit architecture requires making a choice of what the function-calling ABI should be for such types (and corresponding complex types) as function arguments and return values; architecture maintainers would need to make such a choice, in consultation with any group there may be that maintains the ABI for that architecture.