How to link multiple libraries using CMake

Question

I have some code to do with DCMTK. I can successfully build and run it if I use g++ from the command line. This is the code:

#include "dcmtk/config/osconfig.h" #include "dcmtk/dcmdata/dctk.h" int main() { DcmFileFormat fileformat; OFCondition status = fileformat.loadFile("test.dcm"); if (status.good()) { OFString patientsName; if (fileformat.getDataset()->findAndGetOFString(DCM_PatientsName, patientsName).good()) { cout << "Patient's Name: " << patientsName << endl; } else cerr << "Error: cannot access Patient's Name!" << endl; } else cerr << "Error: cannot read DICOM file (" << status.text() << ")" << endl; return 0; }

This is the build command:

g++ testeapp.cxx -DHAVE_CONFIG_H -I/path_to_dcmtk/include -L/path_to_dcmtk/lib -pthread -ldcmdata -lz -loflog -lofstd -o main

I want to make a CMakeLists.txt to build it in Kdevelop. This is what I currently have:

 # Configure toplevel directories SET( PREFIX ${CMAKE_INSTALL_PREFIX} CACHE PATH "Top level.") SET( INCLUDEDIR ${PREFIX}/include CACHE PATH "Include files.") SET( LIBDIR ${PREFIX}/lib CACHE PATH "Libraries.") FIND_PACKAGE ( Threads REQUIRED ) # Configure DCMTK FIND_PATH( DINIFTI_DCMTK_INCLUDE dcmtk PATHS ${INCLUDEDIR} PATH_SUFFIXES dcmtk DOC "Path to the DCMTK headers." ) FIND_LIBRARY(DINIFTI_DCMTK_LIB NAMES dcmdata ofstd oflog HINTS ${LIBDIR} ${LIBDIR}) TARGET_LINK_LIBRARIES( dinifti ${DINIFTI_DCMTK_LIB} ${DINIFTI_ZNZ_LIB} ${CMAKE_THREAD_LIBS_INIT} z )

But when I build it, it has this error:

/usr/local/lib/libdcmdata.a(dcfilefo.o): In function `DcmFileFormat::remove(DcmItem*)': dcfilefo.cc:(.text+0x1788): undefined reference to `log4cplus::Logger::forcedLog(int, OFString const&, char const*, int, char const*) const'

Can you help me to fix the error? Thank you.

Fraser · Accepted Answer · 2013-03-05 02:15:41Z

It looks like you expect the find_library call to populate the variable DINIFTI_DCMTK_LIB with 3 separate libraries.

This isn't how find_library works. The different arguments after NAMES represent all the various names a single library could be called. This allows the command to work cross-platform, where the same library could be called different things on different platforms.

A minor issue is that you probably should prefer using PATHS instead of HINTS here. Form the docs:

... the HINTS option ... should be paths computed by system introspection, such as a hint provided by the location of another item already found. Hard-coded guesses should be specified with the PATHS option.

I imagine you want something more like:

find_library(DINIFTI_DCMTK_LIB NAMES dcmdata PATHS ${LIBDIR}) find_library(OFSTD_LIB NAMES ofstd PATHS ${LIBDIR}) find_library(OFLOG_LIB NAMES oflog PATHS ${LIBDIR}) target_link_libraries(dinifti ${DINIFTI_DCMTK_LIB} ${OFLOG_LIB} ${OFSTD_LIB} ${DINIFTI_ZNZ_LIB} ${CMAKE_THREAD_LIBS_INIT} z)

There is also a find module for DCMTK; perhaps find_package(DCMTK REQUIRED) would be of help?

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