[RFC][PATCH] Check ELF relocs after opening all all input files

[Nick Clifton]

Hi H.J.

> Here is the first step.  OK for master?

I found a problem with this patch: non-ELF targets fail to build because
ldlang.c:lang_check_relocs() calls _bfd_elf_link_check_relocs() which is
not present in the BFD library.

Thinking about this it seems to me that we ought to allow non-ELF targets
a chance to check the relocs as well.  So what do you think of the attached
patch ?  It adds a new function pointer to the bfd_target structure which 
can be used to checks relocs.  For all non-ELF targets this vector is
initialised to a stub function which just returns true, but this can be
changed at a later date.  The patch also introduces a new, externally 
visible function called bfd_link_check_relocs() which will then call the
target function, and it changes lang_check_relocs() to use this new 
function.

Cheers
  Nick
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