[Bug gdb/13498] save-index makes gdb slow with dwarf4

["l.lunak at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13498

--- Comment #10 from LuboÅ LuÅÃk <l.lunak at suse dot cz> 2012-02-21 18:14:25 UTC ---
I've tried current gdb CVS with the patch mentioned here, and it looks like the
problems caused by the index have been fixed by it, so I guess this bugreport
can be closed.

Attaching gdb to LibreOffice Writer and doing 'break sha<tab>' is still awfully
slow with dwarf-4 though, roughly 30 seconds on a rather fast machine (it
appears the time is spent in dwarf2_psymtab_to_symtab() and below). That is
however with or without the index. With dwarf-2 it is almost instant, but the
difference is that with dwarf-2 the completion list does not include template
instances, which is a majority of the completions. I find this still
unacceptable for dwarf-4 to be usable with something the size LibreOffice.

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