log4cplus link errors when used in VS2012

Question

I've download and compiled log4cplus in VS2012. Compilation was fine (both debug and release) I've tried to use it my code but I get 3 link errors, nothing I tried didn't remove them. I'm using the same includes from the log4cplus project, and the libs I've compiled (tried all 3... debug release and the log4cplusS.lib

I still get these:

error LNK2019: unresolved external symbol "__declspec(dllimport) class std::basic_ostringstream,class std::allocator > & __cdecl log4cplus::detail::get_macro_body_oss(void)" (_imp?get_macro_body_oss@detail@log4cplus@@YAAAV?$basic_ostringstream@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@XZ) referenced in function "int __cdecl Prepare(class std::basic_string,class std::allocator > &,class std::basic_string,class std::allocator > &,class std::basic_string,class std::allocator > &,int *,int *,int *)" (?Prepare@@YAHAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00PAH11@Z)

error LNK2019: unresolved external symbol "__declspec(dllimport) public: static class log4cplus::Logger __cdecl log4cplus::Logger::getInstance(class std::basic_string,class std::allocator > const &)" (_imp?getInstance@Logger@log4cplus@@SA?AV12@ABV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z) referenced in function "int __cdecl Prepare(class std::basic_string,class std::allocator > &,class std::basic_string,class std::allocator > &,class std::basic_string,class std::allocator > &,int *,int *,int *)" (?Prepare@@YAHAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00PAH11@Z)

What is wrong?

My code is simple, in my dll cpp:

in the top of cpp I added

static Logger logger;

in one of the function I've added:

logger = Logger::getInstance(LOG4CPLUS_TEXT("MyDLL"));
LOG4CPLUS_INFO(logger, LOG4CPLUS_TEXT("Prepare Starts"));

wilx · Accepted Answer · 2013-09-16 16:56:31Z

6

It is likely that you have compiled log4cplus using the Release configuration. You will need to use Release_Unicode (similarly for Debug configuration).

answered Sep 16, 2013 at 16:56

wilx

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4 Comments

wilx Over a year ago

Since Visual Studio 2010 (I believe), all new projects are created with TCHAR as wchar_t (Unicode setting in General settings group). This setting defines the UNICODE and _UNICODE preprocessor symbols. These symbols are used by log4cplus as well. If you absolutely want to disable this, you can, but I would suggest against that for anything that is not a toy project.

Dani Over a year ago

Yes, I've used the unicode version, I might need it anyways... not for the log but for the rest of the project...

Saurabh B Over a year ago

Why should we use the "Release_Unicode" instead of "Release"? If i want to use "Release" what should I do?

wilx Over a year ago

@Hawk_85: You can of course do that. But then your own application using log4cplus must be compiled without UNICODE and _UNICODE defined. IOW, your own application will have to be interfacing with log4cplus with plain std::strings instead of std::wstring.

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