https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79793
--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to H.J. Lu from comment #16) > The problem is in create_cie_data: > > /* On entry, the Canonical Frame Address is at SP. */ > memset (&loc, 0, sizeof (loc)); > loc.reg = dw_stack_pointer_regnum; > loc.offset = INCOMING_FRAME_SP_OFFSET; > def_cfa_1 (&loc); > > We lost the function type info with LTO. We didn't lose the info. The problem is that create_pseudo_cfg assumes INCOMING_FRAME_SP_OFFSET is a constant.