* elflink.c (elf_gc_mark_dynamic_ref_symbol): New function.

	* elflink.c (elf_gc_mark_dynamic_ref_symbol): New function.
	(bfd_elf_gc_sections): Fail if a shared object is being created.
	Do not fail if dynamic sections have been created.  Instead call
	elf_gc_mark_dynamic_ref_symbol to mark sections that contain
	dynamically referenced symbols.  Do not mark the whole graph
	rooted at .eh_frame, only the section proper.