Error linking personal library which uses log4cplus - c++

Question

I have a weird problem trying to link a simple code which use a personal library which uses lib4cplus.
The file with the main code is so easy and doesn't use log4cplus. I only use lib4cplus into the library. The library compiles correctly but when i link the main file with the library it thowrs errors like that (loggers var not defined under architecture x86_64)
g++ leer.cpp -c
ar r libfichero.a blowfish.o clase.o
g++ -o Class leer.o -lm -lz -llog4cplus libfichero.a
Undefined symbols for architecture x86_64:
"fichero::loggerFichero", referenced from:
fichero::startLoggers() in libfichero.a(clase.o)
fichero::fichero()in libfichero.a(clase.o)
fichero::fichero()in libfichero.a(clase.o)
"fichero::errorLoggerFichero", referenced from:
fichero::startLoggers() in libfichero.a(clase.o)
fichero::fichero()in libfichero.a(clase.o)
fichero::fichero()in libfichero.a(clase.o)
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[1]: *** [all] Error 1
make: *** [p21] Error 2
The errors comes when i want to define my private logger vars (ficheroLogger and errorFicheroLogger).
That's the code in the cpp file of my library.
bool fichero::startLoggers()
{
// Aquí inico los loggers que voy a usar en la clase.
loggerFichero = Logger::getInstance(LOG4CPLUS_TEXT("utils"));
errorLoggerFichero = Logger::getInstance("BigFail");
}
// Método para definir los logs.
bool fichero::initLogFichero()
{
cout << "Entering LOG Config part..." << endl;
LogLog::getLogLog()->setInternalDebugging(true);
Logger root = Logger::getRoot();
// Load the properties
PropertyConfigurator::doConfigure("ficheroLog4cplus.properties");
Logger fileLog = Logger::getInstance(LOG4CPLUS_TEXT("filelogger"));
// Log with INFO level
LOG4CPLUS_INFO(fileLog, "Application startup");
cout << "Exiting the main part()..." << endl;
// Log with INFO level
if (fileLog.isEnabledFor(INFO_LOG_LEVEL))
{
LOG4CPLUS_WARN(fileLog, "Application shutdown");
}
startLoggers();
return true;
}
// Constructor y Destructor
fichero::fichero()
{
nomFile = "file.txt";
delimitador = "";
hayDelimiatador = false;
initLogFichero();
LOG4CPLUS_WARN(loggerFichero, "Inicio normal");
LOG4CPLUS_WARN(errorLoggerFichero, "Inicio error.");
}

Answer 1

This does not look a like a problem of log4cplus. Try to reshuffle the command line:
g++ -o Class leer.o libfichero.a -llog4cplus -lz -lm