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POHow to solve undefined reference errors when linking log4cxx in qmake project
 

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  1. POHow to solve undefined reference errors when linking log4cxx in qmake project
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    <p>It's the second day I'm trying to marry Qt5, MinGW and log4cxx.</p> <p>Even after I've compiled everything successfully, linked apr, apr-util and log4cxx libraries, <code>ld</code> gives me a bunch of "undefined reference" problems.</p> <p>It looks like different settings were specified during log4cxx compilation (I'm using ant). Was anyone able to successfully compile and use log4cxx with MinGW?</p> <p>Environment:</p> <ul> <li>log4cxx trunk </li> <li>apr 1.4.6 </li> <li>apr-util 1.5.2 </li> <li>latest MinGW</li> <li>I'm using Qt 5 with latest MinGW as a compiler</li> </ul> <p>What I've done:</p> <ul> <li>compiled log4cxx using ant with the following command: "ant -Dcompiler=gcc -Dfind=false -DLOG4CXX_STATIC=1 -Dlib.type=static" </li> <li>added result libraries to my project in pro file: "LIBS += -L../log4cxx/lib LIBS += -llibapr-1 -llibaprutil-1 -lliblog4cxx"</li> </ul> <p>And now, as I try to link my project, I'm getting the next:</p> <pre><code>*C:/mingw/bin/mingw32-make -f Makefile.Debug mingw32-make[1]: Entering directory 'C:/Work/SPP_Development/AutoHaul/Sub-systems/TCS/Source/build-SimulatorEngine-Standalone_MinGW-Debug' g++ -Wl,-subsystem,windows -mthreads -o debug\SimulatorEngine.exe object_script.SimulatorEngine.Debug -lmingw32 -lqtmaind -L../log4cxx/lib -llibapr-1 -llibaprutil-1 -lliblog4cxx -LC:\Qt\Qt5.0.1\5.0.1\mingw47_32\lib -lQt5XmlPatternsd -lQt5Widgetsd -lQt5Networkd -lQt5Xmld -lQt5Guid -lQt5Cored -llibEGLd -llibGLESv2d -lgdi32 -luser32 Makefile.Debug:200: recipe for target 'debug\SimulatorEngine.exe' failed mingw32-make[1]: Leaving directory 'C:/Work/SPP_Development/AutoHaul/Sub-systems/TCS/Source/build-SimulatorEngine-Standalone_MinGW-Debug' Makefile:34: recipe for target 'debug' failed ../log4cxx/lib/liblog4cxx.lib(mutex.o): In function `ZN7log4cxx7helpers5MutexC2ERNS0_4PoolE': c:/Work/log4cxx/apache-log4cxx-trunc/src/main/cpp/mutex.cpp:35: undefined reference to `apr_thread_mutex_create@12' ../log4cxx/lib/liblog4cxx.lib(mutex.o): In function `ZN7log4cxx7helpers5MutexC2EP10apr_pool_t': c:/Work/log4cxx/apache-log4cxx-trunc/src/main/cpp/mutex.cpp:45: undefined reference to `apr_thread_mutex_create@12' ../log4cxx/lib/liblog4cxx.lib(mutex.o): In function `ZN7log4cxx7helpers5MutexD2Ev': c:/Work/log4cxx/apache-log4cxx-trunc/src/main/cpp/mutex.cpp:55: undefined reference to `apr_thread_mutex_destroy@4'* </code></pre> <p>It looks like log4cxx library cannot findfunctions declared and defined in the apr library by whatever reason.</p> <p>Is there any way to analyze the problem further to see why is this happening?</p>
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    1. USVlad
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    1. COQt has nothing to do with log4cxx and vice versa. Undefined reference results in the fact that you don't link properly with either Qt or log4cxx. From your current post it is unclear undefined references to which symbols you get. Expand your question with the linker output to get more help.
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      1. POHow to solve undefined reference errors when linking log4cxx in qmake project
      1. USAlexander Shukaev
    2. COYou're right, should've provided more details. Original question updated.
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      1. USVlad
 

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