C++ Protobuffer 2.6与gcc 4.8（macports）的链接错误

我已经通过macports和GCC4.8安装了Google protobuffers的2.6版，当我编译代码（使用-lprotobuf标志）时，得到以下链接错误：

Undefined symbols for architecture x86_64:
  "google::protobuf::MessageLite::ParseFromString(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)", referenced from:
      _main in cclSIxVT.o
  "google::protobuf::MessageFactory::InternalRegisterGeneratedFile(char const*, void (*)(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&))", referenced from:
      protomessages::protobuf_AddDesc_msg_2eproto()       in cc219IO6.o
  "google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned char*)", referenced from:
      protomessages::DatabaseRequestInfo::SerializeWithCachedSizesToArray(unsigned char*) const in cc219IO6.o
  "google::protobuf::internal::WireFormatLite::WriteBytesMaybeAliased(int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, google::protobuf::io::CodedOutputStream*)", referenced from:
      protomessages::DatabaseRequestInfo::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const  in cc219IO6.o
  "google::protobuf::internal::WireFormatLite::ReadBytes(google::protobuf::io::CodedInputStream*, std::basic_string<char, std::char_traits<char>, std::allocator<char> >*)", referenced from:
      protomessages::DatabaseRequestInfo::MergePartialFromCodedStream(google::protobuf::io::CodedInputStream*)       in cc219IO6.o
  "google::protobuf::DescriptorPool::FindFileByName(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const", referenced from:
      protomessages::protobuf_AssignDesc_msg_2eproto()       in cc219IO6.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

我已经检查过库是否编译为64位

Non-fat file: /opt/local/lib/libprotobuf.a is architecture: x86_64

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你知道我哪里出错了吗？

如果你需要关于链接失败的帮助，你至少需要发布链接失败的命令，而不仅仅是它的效果。你的protobuf库是64位的？是的。它是使用macports安装的。（请参见上面的确认）您的问题似乎是重复的。如果是这样的话，你可以自己关闭它。不，不是这样，我正在使用gcc 4.8。很遗憾：（如果你需要帮助解决链接失败的问题，你需要发布至少失败的link命令，而不仅仅是它的效果。你的protobuf库是64位的？是的。它是使用macports安装的。（请参见上文确认）似乎您的问题是的重复。如果是这样，您可以自己关闭它。不，不是，我正在使用gcc 4.8：(

Non-fat file: /opt/local/lib/libprotobuf.a is architecture: x86_64