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POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
 

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  1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
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    <p>I am cross compiling Raspberry Pi project on x86_64/Ubuntu 13.04. After invoking <strong>cmake</strong> with:</p> <pre><code>cmake -DCMAKE_TOOLCHAIN_FILE=./Toolchain-raspberry.pi . </code></pre> <p>and then <strong>make</strong>, linking fails:</p> <pre><code>/opt/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lopencv_gpu ... </code></pre> <p>The problem is that <strong>cmake</strong> generated Makefile invokes linker in the following way:</p> <pre><code>/opt/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ CMakeFiles/Watson.dir/main.cpp.o -o Watson -rdynamic -lopencv_gpu -lopencv_contrib -lopencv_legacy -lopencv_objdetect -lopencv_calib3d -lopencv_features2d -lopencv_video -lopencv_highgui -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_core </code></pre> <p>and it does not specify paths to those shared libraries. However, if I manually add <strong>--sysroot /opt/rpi-rootfs/</strong> flag to the command above, then linking succeeds.</p> <p><strong>What is the recommended way to get cmake to specify the right paths to the shared libraries when cross compiling?</strong></p> <p>Here is my <strong>Toolchain-raspberry.pi</strong> file:</p> <pre><code>SET(CMAKE_SYSTEM_NAME Linux) SET(CMAKE_SYSTEM_VERSION 1) SET(CMAKE_C_COMPILER /opt/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc) SET(CMAKE_CXX_COMPILER /opt/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++) SET(CMAKE_FIND_ROOT_PATH "/opt/rpi-rootfs/") SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) </code></pre> <p>And this is my <strong>CMakeList.txt</strong> file:</p> <pre><code>cmake_minimum_required(VERSION 2.8) project(watson) add_executable(Watson main.cpp) find_package(OpenCV REQUIRED) target_link_libraries(Watson ${OpenCV_LIBS}) </code></pre> <p>The /usr and /lib directories from the target are rsync'ed to /opt/rpi-rootfs/ and all the necessary *.so files are there. After reading <strong>cmake</strong> documentation, I would have expected that setting <strong>CMAKE_FIND_ROOT_PATH</strong> would solve this problem, but apparently not. I am using <strong>cmake</strong> version 2.8.10.1.</p>
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      1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
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      1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
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    1. COHave you tried to use [Buildroot](http://buildroot.uclibc.org/) or [OpenEmbedded](http://www.openembedded.org/wiki/Main_Page)? As far as I can see you're using Debian (at least on RPi), have you looked at [xapt stuff](https://wiki.debian.org/EmdebianToolchain)?
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      1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
      1. USyegorich
    2. COSee this [blog](http://blog.galemin.com/tag/opencv/) for BR example/image.
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      1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
      1. USyegorich
    3. COHave you been able to solve the problem?
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      1. POHow to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
      1. USChristian Rapp
 

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