[CMake] linking libraries at many levels
Pol Monsó IRI
pmonso at iri.upc.edu
Tue Aug 25 09:51:46 EDT 2009
>
> DON'T EVER do something like this unless you really know what you're doing.
> The proper way of doing this is to use the Debug configuration at
> configure-time:
>
> cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS=-Wall /path/to/source
>
Thanks for the tip! I had just put the warnings on to find out some more
about what could be going wrong
This should be:
>
> TARGET_LINK_LIBRARIES( calClient
> ${OPENCV_LIBRARIES}
> callibs
> )
>
I changed it, the make went without any appreciable effect. Here's hte
output:
pmonso at delucia:~/YARP/Calclient$ make VERBOSE=1
> /usr/local/bin/cmake -H/home/pmonso/YARP/Calclient
> -B/home/pmonso/YARP/Calclient --check-build-system CMakeFiles/Makefile.cmake
> 0
> /usr/local/bin/cmake -E cmake_progress_start
> /home/pmonso/YARP/Calclient/CMakeFiles
> /home/pmonso/YARP/Calclient/CMakeFiles/progress.make
> make -f CMakeFiles/Makefile2 all
> make[1]: Entering directory `/home/pmonso/YARP/Calclient'
> make -f lib/CMakeFiles/callibs.dir/build.make
> lib/CMakeFiles/callibs.dir/depend
> make[2]: Entering directory `/home/pmonso/YARP/Calclient'
> cd /home/pmonso/YARP/Calclient && /usr/local/bin/cmake -E cmake_depends
> "Unix Makefiles" /home/pmonso/YARP/Calclient /home/pmonso/YARP/Calclient/lib
> /home/pmonso/YARP/Calclient /home/pmonso/YARP/Calclient/lib
> /home/pmonso/YARP/Calclient/lib/CMakeFiles/callibs.dir/DependInfo.cmake
> --color=
> make[2]: Leaving directory `/home/pmonso/YARP/Calclient'
> make -f lib/CMakeFiles/callibs.dir/build.make
> lib/CMakeFiles/callibs.dir/build
> make[2]: Entering directory `/home/pmonso/YARP/Calclient'
> make[2]: Nothing to be done for `lib/CMakeFiles/callibs.dir/build'.
> make[2]: Leaving directory `/home/pmonso/YARP/Calclient'
> /usr/local/bin/cmake -E cmake_progress_report
> /home/pmonso/YARP/Calclient/CMakeFiles 3 4 5
> [ 60%] Built target callibs
> make -f CMakeFiles/calClient.dir/build.make CMakeFiles/calClient.dir/depend
> make[2]: Entering directory `/home/pmonso/YARP/Calclient'
> cd /home/pmonso/YARP/Calclient && /usr/local/bin/cmake -E cmake_depends
> "Unix Makefiles" /home/pmonso/YARP/Calclient /home/pmonso/YARP/Calclient
> /home/pmonso/YARP/Calclient /home/pmonso/YARP/Calclient
> /home/pmonso/YARP/Calclient/CMakeFiles/calClient.dir/DependInfo.cmake
> --color=
> make[2]: Leaving directory `/home/pmonso/YARP/Calclient'
> make -f CMakeFiles/calClient.dir/build.make CMakeFiles/calClient.dir/build
> make[2]: Entering directory `/home/pmonso/YARP/Calclient'
> Linking CXX executable calClient
> /usr/local/bin/cmake -E cmake_link_script CMakeFiles/calClient.dir/link.txt
> --verbose=1
> /usr/bin/c++ -g -Wall -fPIC CMakeFiles/calClient.dir/calClient.cpp.o
> CMakeFiles/calClient.dir/chaser.cpp.o -o calClient -rdynamic -Llib
> /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_dev.a
> /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_sig.a
> /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_OS.a -lACE -lcv -lcvaux -lcxcore
> -lhighgui lib/libcallibs.a /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_dev.a
> /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_sig.a
> /home/pmonso/YARP/yarp-2.2.2/lib/libYARP_OS.a -lACE -Wl,-rpath,lib
> CMakeFiles/calClient.dir/calClient.cpp.o: In function
> `incrementalCalibrate(yarp::dev::IPositionControl*, yarp::dev::IEncoders*)':
> /home/pmonso/YARP/Calclient/calClient.cpp:276: undefined reference to
> `print_double_array(double const*, int)'
> /home/pmonso/YARP/Calclient/calClient.cpp:277: undefined reference to
> `print_double_array(double const*, int)'
> /home/pmonso/YARP/Calclient/calClient.cpp:295: undefined reference to
> `print_double_array(double const*, int)'
> CMakeFiles/calClient.dir/calClient.cpp.o: In function
> `calibrate(yarp::dev::IPositionControl*, yarp::dev::IEncoders*)':
> /home/pmonso/YARP/Calclient/calClient.cpp:155: undefined reference to
> `print_double_array(double const*, int)'
> CMakeFiles/calClient.dir/calClient.cpp.o: In function
> `randomCalibrate(yarp::dev::IPositionControl*, yarp::dev::IEncoders*)':
> /home/pmonso/YARP/Calclient/calClient.cpp:207: undefined reference to
> `print_double_array(double const*, int)'
> CMakeFiles/calClient.dir/calClient.cpp.o:/home/pmonso/YARP/Calclient/calClient.cpp:208:
> more undefined references to `print_double_array(double const*, int)' follow
> collect2: ld returned 1 exit status
> make[2]: *** [calClient] Error 1
> make[2]: Leaving directory `/home/pmonso/YARP/Calclient'
> make[1]: *** [CMakeFiles/calClient.dir/all] Error 2
> make[1]: Leaving directory `/home/pmonso/YARP/Calclient'
> make: *** [all] Error 2
> pmonso at delucia:~/YARP/Calclient$
>
Thank you very much for the quick response!
pol
2009/8/25 Michael Wild <themiwi at gmail.com>
>
> On 25. Aug, 2009, at 15:06, Pol Monsó IRI wrote:
>
> Hello cmake users!
>>
>> I'm quite new to cmake as well as makefiles, and i've bumped the same
>> trouble twice. I'm trying to break a source code into several libraries
>> and
>> a main program. The scenario has one main executable called calClient
>> which
>> uses functions from three libraries, let's say 1A 1B and 2C. Everybody
>> uses
>> library 2C, that is calClient, 1A and 1B. I've stored the source codes of
>> 1A
>> 1C and 2C in a subdirectory called lib/ toghether with a CMakeLists.txt :
>>
>> FIND_PACKAGE(YARP REQUIRED)
>>
>>>
>>> SET(PROJECT_LIBS
>>> 2C.cpp
>>> 2C.h
>>> 1B.cpp
>>> 1B.h
>>> 1A.cpp
>>> 1A.hpp
>>> )
>>>
>>> add_library(callibs ${PROJECT_LIBS})
>>>
>>
>>
>> In the upper directory, toghether with the source code of the main
>> program,
>> I have:
>>
>> project(calibration)
>>
>>>
>>> cmake_minimum_required(VERSION 2.6)
>>>
>>> set(CMAKE_CXX_FLAGS "-g -Wall")
>>>
>>
>
>
>
>
>>> set(PROJECT_SRC
>>> calClient.cpp
>>> calClient.hpp
>>> chaser.cpp
>>> chaser.hpp
>>> )
>>>
>>> FIND_PACKAGE(YARP REQUIRED)
>>> FIND_PACKAGE(OpenCV REQUIRED)
>>>
>>> add_subdirectory(lib)
>>>
>>> INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/lib)
>>> link_directories(lib)
>>>
>>> INCLUDE_DIRECTORIES(${OPENCV_INCLUDE_DIR})
>>>
>>> ADD_EXECUTABLE(calClient ${PROJECT_SRC})
>>> TARGET_LINK_LIBRARIES( calClient ${OPENCV_LIBRARIES} )
>>> TARGET_LINK_LIBRARIES( calClient callibs )
>>>
>>
>
>
>
>> Every header includes the headers of the files which contains the
>> functions
>> that it needs. So, calClient.hpp actually includes 1A, 1B and 2C.
>>
>> The output of the make command is then:
>>
>> [ 60%] Built target callibs
>>> Linking CXX executable calClient
>>> CMakeFiles/calClient.dir/calClient.cpp.o: In function
>>> `incrementalCalibrate(yarp::dev::IPositionControl*,
>>> yarp::dev::IEncoders*)':
>>> /home/pmonso/YARP/Calclient/calClient.cpp:276: undefined reference to
>>> `print_double_array(double const*, int)'
>>> /home/pmonso/YARP/Calclient/calClient.cpp:277: undefined reference to
>>> `print_double_array(double const*, int)'
>>> /home/pmonso/YARP/Calclient/calClient.cpp:295: undefined reference to
>>> `print_double_array(double const*, int)'
>>> CMakeFiles/calClient.dir/calClient.cpp.o: In function
>>> `calibrate(yarp::dev::IPositionControl*, yarp::dev::IEncoders*)':
>>> /home/pmonso/YARP/Calclient/calClient.cpp:155: undefined reference to
>>> `print_double_array(double const*, int)'
>>> CMakeFiles/calClient.dir/calClient.cpp.o: In function
>>> `randomCalibrate(yarp::dev::IPositionControl*, yarp::dev::IEncoders*)':
>>> /home/pmonso/YARP/Calclient/calClient.cpp:207: undefined reference to
>>> `print_double_array(double const*, int)'
>>>
>>> CMakeFiles/calClient.dir/calClient.cpp.o:/home/pmonso/YARP/Calclient/calClient.cpp:208:
>>> more undefined references to `print_double_array(double const*, int)'
>>> follow
>>> collect2: ld returned 1 exit status
>>> make[2]: *** [calClient] Error 1
>>> make[1]: *** [CMakeFiles/calClient.dir/all] Error 2
>>> make: *** [all] Error 2
>>>
>>>
>>
> In order for this output to be useful, we'd need to see the link-line,
> which you can get by invoking
>
> make VERBOSE=1
>
>
>
>
>
>> The function print_double_array is located in the 2C source and header
>> files
>> which, as I said, is included in calClient header as well as in headers of
>> 1A and 1B.
>>
>> Does somebody know why linking fails? What I am doing wrong? It's driving
>> me
>> nuts!
>>
>
> It's probably that you invoke TARGET_LINK_LIBRARIES twice on the same
> target, as pointed out above.
>
>
>> Thanks alot for your help!
>>
>> pol
>>
>>
> HTH
>
> Michael
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