Re: Initial psymtab replacement results

[Roland McGrath <roland at redhat dot com>]

> I don't think so, or at least, I couldn't think of anything.  Our
> current branches, including F12, check for a known GCC bug, but
> otherwise assume that if aranges exists, it is correct.

FWIW, elfutils (libdw) does use it and rely on its correctness for
address->CU lookups.  But that direction of lookup is only used in
eu-addr2line and in systemtap's rarely-used numeric address probe syntax.

> There's also an issue with knowing whether it is actually complete; I
> didn't think of this until relatively recently:
>     http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42288

I think we discussed this before and I've forgotten again why that issue
matters.  In the status quo there is a .debug_aranges hunk for each CU from
the beginning of the existing of the corresponding .debug_info hunk at
compile time, and that can never be "stripped" except by strip et al
that remove .debug_info along with it.

> I think this question is related to Keith's work on avoiding
> DW_AT_MIPS_linkage_name.  I think the current answer is that there are
> some known missing DWARF features relating to C++.  However, Keith and
> Dodji have worked on GNU extensions for at least some of these.

I take this to mean a verification of my supposition that .debug_pub*
indeed are not a generic extraction from the DIE tree as things stand.


Thanks,
Roland