[Bug debug/48459] [4.6/4.7 Regression] avr: Assertion failure with -gdwarf-2

["rth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48459

--- Comment #26 from Richard Henderson <rth at gcc dot gnu.org> 2011-06-15 14:40:58 UTC ---
(In reply to comment #25)
> (Assuming that backporting implies the emission of DWARF2 CFI) Is it not
> possible to drop DWARF2 CFI feature (which is optional) and still make 4.6x
> build successful? It is quite possible that some target might want to do this.

Um.  Why?  This is not using dwarf2 cfi for unwinding; that is
still using setjmp.  This is using dwarf2 cfi for debugging,
which is exactly what you asked for when you said -gdwarf-2.

If you mean the assembler .cfi directives, you do not need
that in order for the build to succeed.  But that is detected
at configure time; if you have an assembler that accepts them
we will emit them, otherwise we'll emit the cfi data as .byte.

If you mean something else, I don't know what it is.