[LLVMdev] What's the difference between using llvm-link and using llvm gold plugin?

[Tianyin Xu]

Hi, Duncan,

Thank you very much for your reply.
I see. But actually I don't need the optimization because I just want to do
static analysis upon the bitcode file. :-)

Best regards,
Tianyin

On Wed, Jun 27, 2012 at 12:50 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi,
>
> > I got your point! Thanks a lot, Rafael!
>
> one big difference is that llvm-link doesn't do any optimization, while
> the gold
> linker does.  You can get something similar to gold by using llvm-link,
> and then
> running "opt -std-link-opts" on the linked bitcode file.  However all
> symbols
> will be internalized by default (you can adjust this on the command line)
> while
> the gold linker is more sophisticated about what is internalized as Rafael
> mentioned.
>
> Ciao, Duncan.
>
> >
> > Best,
> > Tianyin
> >
> > On Tue, Jun 26, 2012 at 4:12 PM, Rafael Espíndola <
> rafael.espindola at gmail.com
> > <mailto:rafael.espindola at gmail.com>> wrote:
> >
> >      > Could you explain a bit more (sorry I'm not from a compiler
> background)? So,
> >      > what's the difference in the analysis perspective? What does
> "reading ELF
> >      > files and archives" and "creating a list of symbols passed to
> llvm's
> >      > internalize pass" do?
> >      >
> >      > I checked a little bit the corresponding .ll file generated
> according to the
> >      > .bc file. It seems that symbols like struct and function names are
> >      > preserved. What is missing here? Is it possible for you to give
> an simple
> >      > example?
> >
> >     There is an example in
> >
> >     http://llvm.org/docs/GoldPlugin.html#example1
> >
> >     Where some files are native ELF files and some are IL. Gold is able
> to
> >     handle it, llvm-link will just tell you that it doesn't know about
> the
> >     ELF format.
> >
> >      > Thanks a lot!
> >      > Tianyin
> >
> >
> >     Cheers,
> >     Rafael
> >
> >
> >
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