Re: A ELF executable can be reloctable?

["Cliff Tsai" <clifftsai at minecard dot com dot tw>]

----- Original Message -----
From: "Ola Liljedahl" <olli@enea.se>
To: "Jonathan Larmour" <jlarmour@redhat.com>
Cc: "Cliff Tsai" <clifftsai@minecard.com.tw>; "crossgcc"
<crossgcc@sources.redhat.com>
Sent: Friday, February 23, 2001 4:59 AM
Subject: Re: A ELF executable can be reloctable?


> Jonathan Larmour wrote:
> >
> > > Cliff Tsai wrote:
> > >
> > > Hi:
> > >     We know that a ELF shared library is dynamic linking and
> > >     reloctable,
> >
> > Actually they don't always need to be relocatable, although it is
> > recommended and usually what you want.
> >
> > > and how about the ELF executables?
> > >     Are ELF executables reloctable?
> >
> > Not by default. In general, you need to compile with -fPIC to get this
> > although the specifics can differ between architectures.
> Many embedded compilers (Green Hills, Diab) generate executable ELF files
> with relocation information. We use that to run time load and relocate
> ELF programs into OSE single address space (but protected) memory.
>
> With some tricks it is even possible to make GCC generate relocatable
> (and absolutely linked) ELF files.
> --
> Ola

What tricks,can you expalin in more detail?
I'm not that fimilar to compiler.
Thank!



__________________________________________________________________
> Ola Liljedahl   olli@enea.se   System Architect   Enea OSE Systems AB
>



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