[CMake] Using different installs/versions of the OpenCV library

[Andreas Stahl]

Hello Bart,

have you tried setting OpenCV_DIR before calling find_package()? I'm 
basing this on http://opencv.willowgarage.com/wiki/FindOpenCV.cmake
Most package <PKG>Find.cmake scripts look if <PKG>_DIR is set to a valid 
directory and look there first for all the libraries before checking 
default install paths. You would use it like this:

if(USE_TMP_OPENCV)
set(OpenCV_DIR /tmp/opencv_install)
elseif(USE_FAT_OPENCV)
set(OpenCV_DIR "/bla/bla/bla/opencv")
endif()

find_package(OpenCV REQUIRED)

Cheers,
Andreas S.

Am 14.02.2013 11:42, schrieb Bart Vandewoestyne:
> Hello list,
>
> To compile and link my code with the OpenCV library, I use
>
> find_package( OpenCV REQUIRED )
> ...
> add_executable(framecountertest framecountertest.cpp)
> target_link_libraries(framecountertest ${OpenCV_LIBS})
>
> and this works just fine: the OpenCV library that got installed using
> my package management system on Ubuntu 12.10 is being used.
>
> However, under the directory /tmp/opencv_install I have another manual
> installation of a more recent OpenCV library, and I would like to use
> that one instead of the default on my system, or easily switch between
> the two versions.  How should I specify that in my CMakeLists.txt
> file?  I have tried
>
> set(OpenCV_FOUND "1")
> set(OpenCV_INCLUDE_DIR
> "/home/bart/Git/Research/fat/inc/TraficonOpenCv/opencv")
> set(OpenCV_LIBS
> "opencv_gpu;opencv_contrib;opencv_legacy;opencv_objdetect;opencv_calib3d;opencv_features2d;opencv_video;opencv_highgui;opencv_ml;opencv_imgproc;opencv_flann;opencv_core")
> include_directories(${OpenCV_INCLUDE_DIR})
> ...
> add_executable(framecountertest framecountertest.cpp)
> target_link_libraries(framecountertest ${OpenCV_LIBS})
>
> but even with these commands, still the default libs on my system are
> being used...
>
> What is the correct way to specify that I want to build with the
> install under /tmp/opencv_install ?  And how can I easily switch
> between versions without needing to remove one or the other version?
>
> Thanks!
> Bart
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-- 
Andreas Stahl, Dipl. Medien-Inf.

Technische Universität Dresden
Fakultät Informatik
Institut für Software- und Multimediatechnik
Professur Mediengestaltung
01062 Dresden
Tel.: +49 (351) 463-37928
Fax:  +49 (351) 463-39261
E-Mail: andreas.stahl at tu-dresden.de



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