it would be very helpful if you could add a dwarf2 useflag (for ./configure --enable-dwarf-2) or set it by default.
actually, what we need to enable dwarf2 is to add the --enable-dwarf2 switch to the configure call of gcc. which is specified in toolchain.eclass. to be reassigned
Not sure what you are looking for, but EXTRA_ECONF probably does what you want.