[PATCH] elf/get-dynamic-info.h: fix early GNU_HASH processing on ia64

[Sergei Trofimovich]

On Mon, 28 Dec 2015 12:57:00 +0100
Florian Weimer <fweimer@redhat.com> wrote:

> On 12/28/2015 06:12 AM, Mike Frysinger wrote:
> > i don't think this change is what we want -- you're modifying common code
> > in a non-obvious way to trick gcc on a specific arch to generate "better"
> > code.  future versions of gcc (or reasonable code shuffling here) could
> > easily break this behavior.
> 
> Agreed, this looks rather fishy.
> 
> Would it be possible to add a GCC option which inhibits it from creating
> such relocations, so that the required parts of the dynamic linker can
> be compiled with it?

I agree the patch is fragile.
I think gcc can be taught to use something like

    movl r32 = @gprel(_rtld_local#+15032385536)
    add  r32 = r32, gp

on ia64. That would (i hope) use statically resolvable
relocation and would not require .got entry.

-- 

  Sergei
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 181 bytes
Desc: not available
URL: <http://sourceware.org/pipermail/libc-alpha/attachments/20151228/3ca65e31/attachment.sig>