http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50737
--- Comment #8 from Uros Bizjak <ubizjak at gmail dot com> 2011-10-15 16:35:16 UTC --- (In reply to comment #7) > > ... but looking at Dwarf2 frames dump, there is no "S" in any of the CIE > > augmentation data. > > Try to add > > fs->signal_frame = 1; > > at the end of alpha_fallback_frame_state then. Whoa, Throw_3 passes with following patch: Index: config/alpha/linux-unwind.h =================================================================== --- config/alpha/linux-unwind.h (revision 179788) +++ config/alpha/linux-unwind.h (working copy) @@ -74,5 +74,7 @@ fs->regs.reg[64].how = REG_SAVED_OFFSET; fs->regs.reg[64].loc.offset = (long)&sc->sc_pc - new_cfa; fs->retaddr_column = 64; + fs->signal_frame = 1; + return _URC_NO_REASON; } I'm doing full bootstrap+regression test.