include/

	* bfdlink.h (bfd_link_repair_undef_list): Declare.
bfd/
	* elf64-ppc.c (ppc64_elf_check_directives): Move undefs list fixup..
	* linker.c (bfd_link_repair_undef_list): ..to new function, but don't
	remove anything but new and undefweak.
	* elflink.c (_bfd_elf_link_create_dynamic_sections): Override any
	existing _DYNAMIC.
	(_bfd_elf_create_dynamic_sections): Formatting.
	(bfd_elf_record_link_assignment): Call bfd_link_repair_undef_list.
	(_bfd_elf_merge_symbol): Don't handle as-needed syms here.
	(struct elf_smash_data): New.
	(elf_smash_syms): New function.
	(elf_link_add_object_symbols): Call elf_smash_syms.  Don't add
	unneeded dynamic objects to loaded list.
	(elf_link_output_extsym): Don't handle as-needed here.  Strip
	bfd_link_hash_new symbols.
	* elf32-cris.c (elf_cris_discard_excess_program_dynamics): Don't
	delref when dynindx is already -1.
	* elf64-alpha.c (elf64_alpha_output_extsym): Strip bfd_link_hash_new
	symbols.
	* elfxx-mips.c (mips_elf_output_extsym): Likewise.
ld/
	* ld.texinfo: Clarify --as-needed operation.

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