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Author Topic: Linker error at sf::Time  (Read 4177 times)

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Nexus

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Linker error at sf::Time
« on: January 21, 2012, 12:53:01 am »
Using Visual Studio 2010, I get strange linker errors when I compile the SFML Network module with dynamic (DLL) configuration.
Code: [Select]
3>Ftp.obj : error LNK2001: Unresolved external symbol ""public: static class sf::Time const sf::Time::Zero" (?Zero@Time@sf@@2V12@B)".
3>SocketSelector.obj : error LNK2001: Unresolved external symbol ""public: static class sf::Time const sf::Time::Zero" (?Zero@Time@sf@@2V12@B)".
3>TcpSocket.obj : error LNK2001: Unresolved external symbol ""public: static class sf::Time const sf::Time::Zero" (?Zero@Time@sf@@2V12@B)".

I don't see a mistake in the code, sf::Time has the SFML_API macro, and Zero is properly defined in Time.cpp. If I interpret the Dependency Walker output correctly, this symbol is exported in sfml-system-d-2.dll. With MinGW/g++, SFML compiles fine.

Can anybody confirm this? I've also found a similar problem on StackOverflow...
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Breakman79

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Linker error at sf::Time
« Reply #1 on: January 21, 2012, 02:07:18 am »
I just updated my copy from git and I get that same error from sfml-network and this one from sfml-audio:

Code: [Select]
SoundStream.obj : error LNK2019: unresolved external symbol "public: static class sf::Time const sf::Time::Zero" (?Zero@Time@sf@@2V12@B) referenced in function "private: bool __thiscall sf::SoundStream::FillAndPushBuffer(unsigned int)" (?FillAndPushBuffer@SoundStream@sf@@AAE_NI@Z)

Laurent

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Linker error at sf::Time
« Reply #2 on: January 21, 2012, 10:37:01 am »
It's fixed, thanks for the quick feedback.

On a side note, it also answers a question that I've always asked to myself (-> how it could work with a single export macro for all modules) :)
Laurent Gomila - SFML developer

Nexus

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Linker error at sf::Time
« Reply #3 on: January 21, 2012, 10:53:52 am »
Thank you for the fast fix! :)

I didn't expect it to be that complex. If I understand correctly, you now use __declspec(dllexport) only for the currently compiled module, and __declspec(dllimport) for modules on which the current one depends.
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Laurent

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Linker error at sf::Time
« Reply #4 on: January 21, 2012, 11:36:45 am »
Quote
If I understand correctly, you now use __declspec(dllexport) only for the currently compiled module, and __declspec(dllimport) for modules on which the current one depends.

Correct ;)
Laurent Gomila - SFML developer