COFF questions

[Stephen Biggs]

Can someone explain what the "_globals_" symtab built by coffread.c is
for, built even when there is DWARF-2 info?

How does GDB cope with executables that provide debugging info in two
different formats for the same compilation unit?  That is, in the COFF
case, if it finds the symbol in the _globals_, it stops reading and this
symbol either doesn't have enough information, or has wrong information,
to permit source level debugging.  How do I make GDB continue to search
for DWARF-2 info if it is present?

I saw a thread in the archives by David Carlton about a call-back
version of symbol_lookup.  Is there anything new on this?