https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61799
--- Comment #2 from Émeric MASCHINO <emeric.maschino at gmail dot com> --- (In reply to Richard Biener from comment #1) > Please try at least GCC 4.8 - both 4.6 and 4.7 are no longer supported. GCC 4.8 is fine, thanks. I've tracked down the commit that fixed all of this to revision 191928, aiming to fix PR rtl-optimization/54457 [2]. Back to the original GDB issue, can it now be explained (breakage and fix) by retrospectively looking at the code modified by revisions 165240 and 191928? Or does it make no sense at all and I'm simply observing random side-effects of some more subtle breakage elsewhere? Émeric [1] https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=191928 [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54457