Re: Sort output dynamic relocations.

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On 7/10/2011 9:27 PM, Carlos O'Donell wrote:
On Sat, Jul 9, 2011 at 11:08 AM, John David Anglin<dave.anglin@xxxxxxxx>  wrote:
As far as I can tell, most targets don't sort dynamic relocations.  The
exceptions that I see are mips and score.  Doing this will increase link time, so I
tend to think it should be avoided if possible.  Isn't the dynamic loader a special case?
Ulrich Drepper says that relative relocations must *always* be first,
it doesn't require a complete sort.

I'm not knowledgeable about x86 but I don't believe it has a relocation equivalent to the PLABEL32 reloc. Everything in .rel.dyn may be relative. However, R_386_RELATIVE
seems to occur before R_386_GLOB_DATA.  I'm not sure how this is done.

If we need to sort, combreloc may need to be disabled because it might do an incompatible
sort.

The dynamic loader is a special case, but there are some requirements.

Have you tried the ld "-z combreloc" option to see if that works?  It
combines reloc sections and sorts them.
I haven't tried that yet, are you saying we should change binutils to
*default* to "-z combreloc?"
No. I was just thinking of trying to link the dynamic loader with this option. Didn't notice
any other targets making it the default.

Dave

--
John David Anglin    dave.anglin@xxxxxxxx

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