gold patch committed: Warn about undefined protected symbols

[Ian Lance Taylor]

It's an error to refer to a protected/hidden/internal symbol which is
not defined locally.  The dynamic linker will not be able to resolve
such a reference.  I committed this patch to gold to make it gives
error about such cases.

Ian


2010-01-12  Ian Lance Taylor  <iant@google.com>

	* target-reloc.h (visibility_error): New inline function.
	(relocate_section): Call visibility_error.
	* testsuite/Makefile.am (check_DATA): Add protected_3.err.
	(MOSTLYCLEANFILES): Likewise.
	(protected_4_pic.o, protected_3.err): New targets.
	* testsuite/protected_4.cc: New file.


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