cgraphunit.c (process_function_and_variable_attributes): Mark dllexport-ed function/variables as needed.

2010-11-25  Kai Tietz  <kai.tietz@onevision.com>

	* cgraphunit.c (process_function_and_variable_attributes):
	Mark dllexport-ed function/variables as needed.
	* ipa.c (cgraph_externally_visible_p): Make dllexport-ed
	as externally visible.

2010-11-25  Kai Tietz  <kai.tietz@onevision.com>

	* gcc.dg/dll-8.c: New.

From-SVN: r167144