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Date: Thu, 30 Jun 2011 10:52:13 +0000
Subject: Issue 308 in protobuf: unresolved external symbol kEmptyString when
 linking protobuf as a dll.
From: proto...@googlecode.com
To: protobuf@googlegroups.com
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Status: New
Owner: liuj...@google.com
Labels: Type-Defect Priority-Medium

New issue 308 by 0902h...@gmail.com: unresolved external symbol  
kEmptyString when linking protobuf as a dll.
http://code.google.com/p/protobuf/issues/detail?id=308

What steps will reproduce the problem?
1.compile protobuf 2.4.1 as a dll.
2.generate *.pb.h/cc with protoc.exe and add to the vs2008 project.
3.set include path and lib path, compile, link.

What is the expected output? What do you see instead?
expected: no errors.
actual: unresolved external symbol "class std::basic_string<char,struct  
std::char_traits<char>,class std::allocator<char> > const  
google::protobuf::internal::kEmptyString"

What version of the product are you using? On what operating system?
2.4.1 on Windows 7.

Please provide any additional information below.
::google::protobuf::internal::kEmptyString is used in generated .cc files  
and declared as "extern const ::std::string kEmptyString;" in  
generated_message_util.h, but it is not exported.