https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57845
--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > Contrary to the rationale for closing this bug, the option > -freg-struct-return seems to be supported and does work fine in some cases, > see below. What do I miss? That it works in some cases doesn't mean that it is supported. Did you try to compile more than toy examples with the 3.4.4 compiler?