eh_frame_hdr warning

[Nathan Sidwell]

Alan,
you added a warning to elf-eh-frame.c 
(http://sourceware.org/ml/binutils/2007-04/msg00320.html).

I'm adding dwarf eh handing to vxworks, and I'm running into this for rtp shared 
objects.  Such objects are very uclinux-like, in that the delta between text and 
data segments is not fixed at link time.  So we can't generate a relative 
.eh_frame and therefore can't generate a .eh_frame_hdr.

This is entirely expected, but I can't figure out how to silence the warning you 
added -- it's just going to confuse.

I'm overriding
elf_backend_can_make_relative_eh_frame
elf_backend_can_make_lsda_relative_eh_frame
elf_backend_encode_eh_address

Is there something else I should be overriding?

nathan
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