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PATCH: PR ld/3958: ELF linker failed to handle relocation against STN_UNDEF

Alan Modra amodra@bigpond.net.au
Mon Mar 5 23:52:00 GMT 2007 
On Sat, Mar 03, 2007 at 03:04:22PM -0800, H. J. Lu wrote:
> But we shouldn't use STN_UNDEF to indicate relocations
> against symbols from removed input sections since STN_UNDEF simply
> means 0 as the symbol value for relocation.

Agreed.  We should instead either relocate against the corresponding
symbol from the kept section and emit a reloc against that symbol, or
zero the section contents and emit an R_*_NONE reloc.  The difficulty
is that this means touching all the ELF backend relocate_section
functions, because we need the reloc howto function to know which bits
need zeroing.  Also, the section contents will need to be cleared on
a relocatable link.

I suppose I should look at doing this, since it was my idea to use a
reloc against STN_UNDEF as a means of passing the info through ld -r.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre
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