Support dead-stripping in ELF objects

[Robinson, Paul]

This time with the attachment...
--paulr

> -----Original Message-----
> From: llvm-commits-bounces at cs.uiuc.edu [mailto:llvm-commits-
> bounces at cs.uiuc.edu] On Behalf Of Robinson, Paul
> Sent: Thursday, March 21, 2013 11:14 AM
> To: llvm-commits at cs.uiuc.edu commits (llvm-commits at cs.uiuc.edu)
> Subject: Support dead-stripping in ELF objects
> 
> A while back I implemented some private changes to how relocations
> were handled in the ELF object writer, so that our linker could
> support dead-stripping.  Apparently MachO has a similar feature, so I
> leveraged some of what was done for that target, including reusing the
> assembler flag/directive.
> 
> I'm told that there may be broader interest in supporting
> dead-stripping in ELF objects, so here's the patch.
> 
> There is currently no in-tree ELF-using target that invokes this
> stuff; I'm putting it out there so anyone who's interested can take
> advantage of it in their own target/toolchain.
> 
> Please review, and commit for me if it's okay.
> 
> Thanks,
> --paulr
> 
> 
> 
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