PATCH: Fix gold problem with weak undefined symbols

[Cary Coutant]

This patch fixes a problem in gold where it incorrectly generates a
dynamic relocation for a reference to a weak undefined symbol, or for
a reference to an absolute symbol.

OK to commit?

-cary


2008-03-31  Cary Coutant  <ccoutant@google.com>

	* symtab.h (Symbol::is_weak_undefined): New function.
	(Symbol::is_strong_undefined): New function.
	(Symbol::is_absolute): New function.
	(Symbol::needs_plt_entry): Exclude weak undefined symbols.
	(Symbol::needs_dynamic_reloc): Exclude weak undefined and
	absolute symbols.
	* testsuite/Makefile.am (check_PROGRAMS): Add weak_undef_test.
	(weak_undef_test): New target.
	* testsuite/Makefile.in: Rebuild.
	* testsuite/weak_undef_file1.cc: New file.
	* testsuite/weak_undef_file2.cc: New file.
	* testsuite/weak_undef_test.cc: New file.
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