gold patch committed: Add --warn-unresolved-symbols

[Ian Lance Taylor]

I committed this patch to gold to add the --warn-unresolved-symbols
option, as well as --error-unresolved-symbols which restores the
default behaviour.

Ian


2010-01-07  Ian Lance Taylor  <iant@google.com>

	PR 10980
	* options.h (class General_options): Add --warn-unresolved-symbols
	and --error-unresolved-symbols.
	* errors.cc (Errors::undefined_symbol): Implement
	--warn-unresolved-symbols.


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