patch for large corefile support on linux

[Andrew Cagney]

> Dear Patches,
> This is a simple patch that seems to allow debugging of >2gb
> corefiles.
> 
> We've had problems dealing with large corefiles on Linux and I
> tried gdb 6.1 recently since it had some code in BFD to do
> lseek64 and stuff.  I noticed all I had to do to get GDB dealing
> with them was to add O_LARGEFILE to the core file open.  (We
> have previously patched our kernel to open the core file write
> with O_LARGEFILE as well, but this may be default in later
> kernels.)  This is on a 32bit x86 platform.
> 
> I doubt it will let >4gb corefiles work in gdb, as the elf32
> header is still being used AFIAK, but it helps.  Also, large
> *program* files aren't covered, but that is less of an issue.
> 
> Diff against 6.1 sources.

Draining the patch backlog for 6.2, I've checked this in.  Thanks!

committed the attached,
Andrew



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