[Bug rtl-optimization/49977] [4.7 Regression] CFI notes are missed for delayed slot

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49977

--- Comment #3 from Richard Henderson <rth at gcc dot gnu.org> 2011-08-04 19:50:03 UTC ---
David, most of those c++ tests require system headers to compile,
but g++.old-deja/g++.robertl/eb31.C does not.

Except that I don't see any changes to unwind info in any delay
slots for that test case, so I'm particularly confused about what
could have gone wrong with that test.  Does it work without delayed
branches?

Or is the problem in fact in libgcc somewhere?  I.e. you have to
compile libgcc with -fno-delayed-branch in order to fix things?