undefined reference to function from log4cpp library

Question

I have another problem ... I downloaded the log4cpp library and compiled it via Microsoft Visual Studio into a .lib-file. Now I want to link that library into a QT Project, but whenever I call a function, such as

std::string initFileName = "log.properties";
log4cpp::PropertyConfigurator::configure(initFileName);

I get lots of errors saying

"undefined reference to `log4cpp::PropertyConfigurator::configure(std::string const&)'"

Here's the code in the project file:

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/log4cpp/ -llog4cppLIB
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/log4cpp/ -llog4cppD
else:unix: LIBS += -L$$PWD/log4cpp/ -llog4cppLIB

INCLUDEPATH += $$PWD/log4cpp/include
DEPENDPATH += $$PWD/log4cpp/include

I don't know, what to do :(

Sounds like you haven't actually linked the .lib file in to your target project. — Moo-Juice, May 14 '13 at 21:47
I did, the editor does suggestions, when I type e.g. log4cpp:: then it shows me all the classes and functions i can use — TheWieand, May 14 '13 at 21:49

score 0 · Answer 1 · answered May 14 '13 at 23:32

0

If the library is compiled with Visual Studio, you should configure the project to use that same compiler instead of mingw/gcc.

answered May 14 '13 at 23:32

alexisdm

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So, I compiled the log4cpp library with mingw and get a .a-library, but the errors still appear :/ – TheWieand May 17 '13 at 12:41

undefined reference to function from log4cpp library

1 Answers1