I just verified that for my small library example, the runtime libraries and character sets specified in the project properties match the log4cxx projects' (apr, apr-util, log4cxx and xml), and yet I still get the errors listed below.
Cheers, Elaine ________________________________ From: Fabian Jacquet [mailto:fabian.jacq...@gmail.com] Sent: Monday, December 15, 2008 4:27 AM To: Log4CXX User Subject: Re: MS Visual Studio 2008 LNK2005 and LNK4006 errors and warnings that seem to be associated with log4cxx Hi, My problem was log4cxx was compiled with /MT option and my project with /MD and one was compiled with unicode character set the other with no unicode. On Mon, Dec 15, 2008 at 09:41, Fabian Jacquet <fabian.jacq...@gmail.com> wrote: Hello, I have the same problem. I tested log4cxx compiled in static mode with a little command line program and all was ok. So now I try to use log4cxx in my big program using GUI and MFC and I have the same link error. I'm searching about a solution. If you find before me please contact me. Thank you. On Wed, Dec 10, 2008 at 03:51, Hale, Elaine <elaine_h...@nrel.gov> wrote: Hello, I was writing and running some tests for a project that uses log4cxx and some other third party libraries, and received the following linking errors upon adding the line ::std::deque<::std::string> textSnippets; to my testing header file (the errors go away if I comment it out): 4>Linking... 4>LINK : C:\projects\pathfinders\cpp\utilities\projects\lib\Debug\ApplicationUtil ities_Tests.exe not found or not built by the last incremental link; performing full link 4>ApplicationUtilities.lib(log4cxx.dll) : error LNK2005: "public: void __thiscall std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::destroy(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *)" (?dest...@?$allocator@v?$basic_str...@du?$char_traits@d...@std@@V?$allocato r...@d@2@@std@@@std@@qaexpav?$basic_str...@du?$char_traits@d...@std@@V?$alloca t...@d@2@@2@@Z) already defined in ApplicationUtilities_Tests.obj 4>ApplicationUtilities.lib(log4cxx.dll) : error LNK2005: "protected: __thiscall std::_Container_base_aux_alloc_empty<class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::~_Container_base_aux_alloc_empty<class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >(void)" (??1?$_container_base_aux_alloc_em...@v?$allocator@v?$basic_str...@du?$c har_tra...@d@std@@v?$alloca...@d@2@@std@@@std@@@std@@i...@xz) already defined in ApplicationUtilities_Tests.obj 4>ApplicationUtilities.lib(log4cxx.dll) : error LNK2005: "public: void __thiscall std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::deallocate(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,unsigned int)" (?dealloc...@?$allocator@v?$basic_str...@du?$char_traits@d...@std@@V?$alloc a...@d@2@@std@@@std@@qaexpav?$basic_str...@du?$char_traits@d...@std@@V?$all oca...@d@2@@2...@i@Z) already defined in ApplicationUtilities_Tests.obj 4>C:\projects\pathfinders\cpp\utilities\projects\lib\Debug\ApplicationUt ilities_Tests.exe : fatal error LNK1169: one or more multiply defined symbols found General online help concerning LNK2005 errors associated with the standard template library suggests checking that all of the runtime libraries (under Properties->C++->Code Generation) in all dependencies are identical. So I did that, and they all seem to be set identically to Multi-threaded Debug DLL (/MDd) (in the debug versions). That includes my log4cxx and other third-party builds. I therefore tried to isolate the problem by creating a small project that reproduces the errors. I didn't quite succeed, but I did get the following warnings, which seem very similar to the LNK2005 errors above, from a simple library that uses log4cxx.lib and deque<string>: 1>------ Rebuild All started: Project: StdLibLinkingBug, Configuration: Debug Win32 ------ 1>Deleting intermediate and output files for project 'StdLibLinkingBug', configuration 'Debug|Win32' 1>Compiling... 1>StdLibLinkingBug.cpp 1>Creating library... 1>StdLibLinkingBug.obj : warning LNK4006: "protected: __thiscall std::_Container_base_aux_alloc_empty<class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::~_Container_base_aux_alloc_empty<class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >(void)" (??1?$_container_base_aux_alloc_em...@v?$allocator@v?$basic_str...@du?$c har_tra...@d@std@@v?$alloca...@d@2@@std@@@std@@@std@@i...@xz) already defined in log4cxx.lib(log4cxx.dll); second definition ignored 1>StdLibLinkingBug.obj : warning LNK4006: "public: void __thiscall std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::deallocate(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,unsigned int)" (?dealloc...@?$allocator@v?$basic_str...@du?$char_traits@d...@std@@V?$alloc a...@d@2@@std@@@std@@qaexpav?$basic_str...@du?$char_traits@d...@std@@V?$all oca...@d@2@@2...@i@Z) already defined in log4cxx.lib(log4cxx.dll); second definition ignored 1>StdLibLinkingBug.obj : warning LNK4006: "public: void __thiscall std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::destroy(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *)" (?dest...@?$allocator@v?$basic_str...@du?$char_traits@d...@std@@V?$allocato r...@d@2@@std@@@std@@qaexpav?$basic_str...@du?$char_traits@d...@std@@V?$alloca t...@d@2@@2@@Z) already defined in log4cxx.lib(log4cxx.dll); second definition ignored 1>Build log was saved at "file://c:\projects\pathfinders\cpp\utilities\projects\debugging\StdLibL inkingBug\Debug\BuildLog.htm" 1>StdLibLinkingBug - 0 error(s), 3 warning(s) ========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ========== Since writing similar small programs with the other third party libraries I'm using did not produce anything similar to the LNK2005 errors, I am guessing that log4cxx is the culprit. Other (possibly) useful information: - the warnings and errors do not go away if I replace deque<string> with vector<string>, but they do go away if I replace deque<string> with deque<int> - the original problem cropped up in a series of dependent static library projects that were finally linked into a .exe. Basically the situation is something like (where x -> y means y uses or is dependent on x): log4cxx -> lib1 (log4cxx wrapper for outputing log messages) -> lib2 -> lib3 (which declares a deque<string> and configures log4cxx loggers); lib2 and lib3 -> exe (which gives linking errors when it declares a deque<string>) - the code for the small library that produced the LNK4006 warnings follows. The .vsproj file lists log4cxx as a dependency. The warnings go away if this listing is removed. // StdLibLinkingBug.h #include <deque> #include <string> #ifndef STDLIBLINKINGBUG_H #define STDLIBLINKINGBUG_H void functionThatLogs(std::deque<std::string>); #endif // STDLIBLINKINGBUG_H // StdLibLinkingBug.cpp #include "StdLibLinkingBug.h" #include <log4cxx/logger.h> using namespace std; using namespace log4cxx; LoggerPtr logger(Logger::getLogger("StdLibLinkingBug")); void functionThatLogs(std::deque<std::string> aStringDeque) { LOG4CXX_WARN(logger,"A silly message " << aStringDeque.at(0)) } Any help anyone can provide would be greatly appreciated. This bug has me stumped! Thanks, Elaine Elaine T. Hale, Ph.D. Buildings and Thermal Systems Center National Renewable Energy Laboratory elaine_h...@nrel.gov 303-384-7812 MS 4111
