include/coff/

include/coff/
	* xcoff.h (XCOFF_ALLOCATED): New flag.

bfd/
	* xcofflink.c (xcoff_mark): When walking the relocations,
	only mark the target symbol or the target section, not both.
	(xcoff_final_definition_p): New function.
	(xcoff_keep_symbol_p): Use it to check whether an external XCOFF
	symbol is a valid definition of the associated output symbol.
	Use XCOFF_ALLOCATED to stop the same hash table entry having
	two output symbols.
	(bfd_xcoff_size_dynamic_sections): Set XCOFF_ALLOCATED when
	keeping a symbol.
	(xcoff_link_input_bfd): Use xcoff_final_definition_p.

ld/testsuite/
	* ld-powerpc/aix-no-dup-syms-1a.s, ld-powerpc/aix-no-dup-syms-1b.s,
	ld-powerpc/aix-no-dup-syms-1.ex, ld-powerpc/aix-no-dup-syms-1.im,
	ld-powerpc/aix-no-dup-syms-1-dso.dnd,
	ld-powerpc/aix-no-dup-syms-1-dso.drd,
	ld-powerpc/aix-no-dup-syms-1-dso.nd,
	ld-powerpc/aix-no-dup-syms-1-dso.rd,
	ld-powerpc/aix-no-dup-syms-1-rel.nd,
	ld-powerpc/aix-no-dup-syms-1-rel.rd: New tests.
	* ld-powerpc/aix52.exp: Run them.