[wip:binutils] Large corefile support

[Andrew Cagney]

Hello,

On the i386, GDB has problems when a corefile is >2gb.  The problems are 
directly attributable to BFD's use of:
	typedef long file_ptr;
and
	fseek (FILE *stream, long int offset, int whence)
The attached, when combined with a BFD/GDB configured / built with 
--enable-64-bit-bfd, lets GDB handle corefiles >2gb, per this test:
http://sources.redhat.com/ml/gdb-patches/2004-01/msg00358.html

Of note in the patch are:

- it scatters #ifdef's to handle fseek et.al. variants
Is there a better way of doing this?

- is requires --enable-64-bit-bfd
A 32-bit BFD has a 32-bit signed file_ptr (limiting SEEK_SET to files up 
to 2gb).  I think the only robust way of handling files larger than that 
2gb is to require a 64-bit file_ptr (and hence --enable-64-bit-bfd).

- it turns out that --enable-64-bit-bfd tickles some bugs in GDB's 
thread code :-/

- given a 3gb core file, 32-bit objdump isn't very helpful
objdump prints zero's instead of error for the sections contents :-( 
Someone might want to look at this.

Anyway, is this "in principal" ok for BFD (assuming I can track down the 
regressions :-)?

Andrew
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