Question 293674 in Ubuntu Question posted in
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Ubuntu – log4cxx undefined reference to `log4cxx::Logger::getLogger(char const*)'

I’ve got 2, according to me, identical cpp projects under Ubuntu Netbeans.

  1. LoggerTestProject
  2. CppApplication2

In the mainfiles of both I’ve integrated the following code:

The result of compiling the first Project is:
#include "log4cxx/logger.h"
#include "log4cxx/basicconfigurator.h"
#include "log4cxx/propertyconfigurator.h"

#include "ratio.h" //only in LoggerTestProject

#include <cstdlib>

#define LOGCONF "./cfg/log4cxx.properties"


using namespace log4cxx;
using namespace log4cxx::helpers;

//extern LoggerPtr logger; //ahaha! AOP should be useful here
LoggerPtr logger(Logger::getLogger("LoggerTestProject"));


//using namespace std;

/*
 * 
 */
int main(int argc, char** argv)
{
    int inVar1 = 0;
LOG4CXX_INFO(logger, "Begin of LoggerTestProject");

Compiling the first one leads to a success:

cd '/home/uwez/NetBeansProjects/LoggerTestProject'
/usr/bin/make -f Makefile CONF=Debug
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory '/home/uwez/NetBeansProjects/LoggerTestProject'
"/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux/loggertestproject
make[2]: Entering directory '/home/uwez/NetBeansProjects/LoggerTestProject'
mkdir -p build/Debug/GNU-Linux/_ext/9bc1829f
rm -f "build/Debug/GNU-Linux/_ext/9bc1829f/ratio.o.d"
g++ -fpermissive   -c -g -I/usr/include/log4cxx -MMD -MP -MF "build/Debug/GNU-Linux/_ext/9bc1829f/ratio.o.d" -o build/Debug/GNU-Linux/_ext/9bc1829f/ratio.o /home/uwez/NetBeansProjects/LoggerTestProject/ratio.cpp
mkdir -p build/Debug/GNU-Linux
rm -f "build/Debug/GNU-Linux/main.o.d"
g++ -fpermissive   -c -g -I/usr/include/log4cxx -MMD -MP -MF "build/Debug/GNU-Linux/main.o.d" -o build/Debug/GNU-Linux/main.o main.cpp
mkdir -p dist/Debug/GNU-Linux
g++ -fpermissive    -o dist/Debug/GNU-Linux/loggertestproject build/Debug/GNU-Linux/_ext/9bc1829f/ratio.o build/Debug/GNU-Linux/main.o -llog4cxx
make[2]: Leaving directory '/home/uwez/NetBeansProjects/LoggerTestProject'
make[1]: Leaving directory '/home/uwez/NetBeansProjects/LoggerTestProject'

wherelse compiling the second one to a failure:

cd '/home/uwez/NetBeansProjects/CppApplication_2'
/usr/bin/make -f Makefile CONF=Debug
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory '/home/uwez/NetBeansProjects/CppApplication_2'
"/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux/cppapplication_2
make[2]: Entering directory '/home/uwez/NetBeansProjects/CppApplication_2'
mkdir -p build/Debug/GNU-Linux
rm -f "build/Debug/GNU-Linux/main.o.d"
g++    -c -g -MMD -MP -MF "build/Debug/GNU-Linux/main.o.d" -o build/Debug/GNU-Linux/main.o main.cpp
mkdir -p dist/Debug/GNU-Linux
g++     -o dist/Debug/GNU-Linux/cppapplication_2 build/Debug/GNU-Linux/main.o 
build/Debug/GNU-Linux/main.o: In function `__static_initialization_and_destruction_0(int, int)':
/home/uwez/NetBeansProjects/CppApplication_2/main.cpp:38: undefined reference to `log4cxx::Logger::getLogger(char const*)'
build/Debug/GNU-Linux/main.o: In function `log4cxx::helpers::ObjectPtrT<log4cxx::Logger>::~ObjectPtrT()':
/usr/include/log4cxx/helpers/objectptr.h:102: undefined reference to `log4cxx::helpers::ObjectPtrBase::~ObjectPtrBase()'
build/Debug/GNU-Linux/main.o:(.data.rel.ro._ZTIN7log4cxx7helpers10ObjectPtrTINS_6LoggerEEE[_ZTIN7log4cxx7helpers10ObjectPtrTINS_6LoggerEEE]+0x10): undefined reference to `typeinfo for log4cxx::helpers::ObjectPtrBase'
collect2: error: ld returned 1 exit status
nbproject/Makefile-Debug.mk:62: recipe for target 'dist/Debug/GNU-Linux/cppapplication_2' failed
make[2]: *** [dist/Debug/GNU-Linux/cppapplication_2] Error 1
make[2]: Leaving directory '/home/uwez/NetBeansProjects/CppApplication_2'
nbproject/Makefile-Debug.mk:59: recipe for target '.build-conf' failed
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory '/home/uwez/NetBeansProjects/CppApplication_2'
nbproject/Makefile-impl.mk:39: recipe for target '.build-impl' failed
make: *** [.build-impl] Error 2

Has anyone got an idea what it could be? The /cfg – folder, which contains the log4cxx.properties file was not present in the second project, so I copied it manually. But it didn’t help.

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    In netbeans 8.2 in the menue open File/project properties.

    click on C++ Compiler and add the path of the log4cxx library to the include Directories. In this case its /usr/include/log4cxx, but it wasn't actually necessary for building the project.

    For building the project it's absolutely necessary to go to linker/libraries and add log4cxx. In the browse window I had to open the folder /usr/lib32 and type log4cxx.so. This is the includefile that is needed to build the project.


  2. 0

    The problem is with the Makefile used in the second project. My guess is that it does not mention Log4cxx (e.g. does not have a -Llog4cxx).
    The log4cxx.properties is used when you run the program, it does not get used when you build the program.

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