在 Ubuntu 上为 Raspberry Pi 交叉编译 opencv 项目答案

【问题标题】：Cross compile opencv project on Ubuntu for Raspberry Pi在 Ubuntu 上为 Raspberry Pi 交叉编译 opencv 项目
【发布时间】：2014-04-10 22:44:40
【问题描述】：

我已经为此苦苦挣扎了 2 天，但无法正常工作。

到目前为止我做了什么：

在 Ubuntu 12.04 LTS 上从源代码构建 opencv 2.4.8 --> OpenCV项目在ubuntu上编译运行
在 Raspberry Pi Raspian 上从源代码构建 opencv 2.4.8 --> OpenCV 项目在树莓派上编译运行
使用 crosstools-ng (http://www.bootc.net/archives/2012/05/26/how-to-build-a-cross-compiler-for-your-raspberry-pi/) 为 Raspberry Pi 构建了一个交叉编译器 --> 在 Ubuntu 上构建的 c++ 程序，在树莓派上运行交叉编译器

我有什么问题：

OpenCV 程序不能用交叉编译器编译

|2|fatal error: opencv2/highgui/highgui.hpp: No such file or directory|

我想我还需要在 ubuntu 上交叉编译 OpenCV。在我的交叉编译器中，我还有一个工具链

# this one is important
SET(CMAKE_SYSTEM_NAME Linux)
#this one not so much
SET(CMAKE_SYSTEM_VERSION 1)

# specify the cross compiler
SET(CMAKE_C_COMPILER
/home/christian/Programming/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc)

SET(CMAKE_CXX_COMPILER
/home/christian/Programming/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-g++)

# where is the target environment
SET(CMAKE_FIND_ROOT_PATH
/home/christian/Programming/x-tools/arm-unknown-linux-gnueabi)

# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

通过这个工具链，我尝试用这个命令交叉编译 OpenCV：

cmake -DCMAKE_TOOLCHAIN_FILE=../Toolchain-RaspberryPi.cmake ../

在 make 命令之后它编译到 27%。它在那里停止并出现此错误

[ 27%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o
In file included from /home/christian/Downloads/opencv-2.4.8/modules/highgui/src/cap_ffmpeg_impl.hpp:60:0,
                 from /home/christian/Downloads/opencv-2.4.8/modules/highgui/src/cap_ffmpeg.cpp:45:
/home/christian/Downloads/opencv-2.4.8/modules/highgui/src/ffmpeg_codecs.hpp:81:36: fatal error: libavformat/avformat.h: No such file or directory
   #include <libavformat/avformat.h>
                                    ^
compilation terminated.
make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o] Error 1
make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
make: *** [all] Error 2

我尝试将在 Raspberry Pi 上编译的 OpenCV 头文件和库复制到我的 ubuntu 计算机并链接它们。编译时出现大量错误

||=== RPi_Cross_CV, Debug ===|
||warning: libz.so.1, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_core.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libjpeg.so.8, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libpng12.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libtiff.so.4, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libjasper.so.1, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgtk-x11-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgdk-x11-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libatk-1.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgio-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libpangoft2-1.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libpangocairo-1.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgdk_pixbuf-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libcairo.so.2, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libpango-1.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libfreetype.so.6, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libfontconfig.so.1, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgobject-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libglib-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgthread-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgstbase-0.10.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgstreamer-0.10.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libgmodule-2.0.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libxml2.so.2, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libdc1394.so.22, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libv4l1.so.0, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libavcodec.so.53, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libavformat.so.53, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libavutil.so.51, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
||warning: libswscale.so.2, needed by ../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8, not found (try using -rpath or -rpath-link)|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `TIFFSetWarningHandler@LIBTIFF_3.9'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `png_read_info@PNG12_0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_time_val_add'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jas_image_writecmpt'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_widget_queue_draw'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `av_guess_codec@LIBAVFORMAT_53'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `av_rescale_q@LIBAVUTIL_51'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jpeg_std_error@LIBJPEG_8.0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jas_cmprof_destroy'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `png_get_tRNS@PNG12_0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_return_if_fail_warning'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_camera_enumerate'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_capture_stop'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `compress'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_get_image_size_from_video_mode'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_timeout_add'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `png_set_packing@PNG12_0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `v4l2_munmap'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_feature_whitebalance_get_value'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_type_new'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jas_image_destroy'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `avcodec_close@LIBAVCODEC_53'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `sws_getCachedContext@LIBSWSCALE_2'|
../../../../Programming/x-tools/usr-local/lib/libopencv_core.so.2.4.8||undefined reference to `gzeof'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_style_attach'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_widget_get_type'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_window_resize'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_cond_broadcast'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_video_get_supported_framerates'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jpeg_read_header@LIBJPEG_8.0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `avio_open@LIBAVFORMAT_53'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `TIFFReadEncodedTile@LIBTIFF_3.9'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `uncompress'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_type_check_instance_cast'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_usleep'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `avcodec_find_decoder@LIBAVCODEC_53'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `g_get_current_time'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jpeg_set_defaults@LIBJPEG_8.0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_video_get_mode'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jpeg_start_compress@LIBJPEG_8.0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `av_free_packet@LIBAVCODEC_53'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_window_set_geometry_hints'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_signal_connect_full'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gdk_draw_rgb_image'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_widget_queue_resize'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `dc1394_video_set_mode'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jas_stream_close'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jpeg_set_quality@LIBJPEG_8.0'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `jas_image_readcmpt'|
../../../../Programming/x-tools/usr-local/lib/libopencv_highgui.so.2.4.8||undefined reference to `gtk_disable_setlocale'|
||More errors follow but not being shown.|
||Edit the max errors limit in compiler options...|
||=== Build finished: 50 errors, 29 warnings ===|

所以我的问题是：

如何让 ubuntu 上的交叉编译器与 opencv 一起使用？我只想在ubuntu上编译，把程序复制到树莓派上运行。

非常感谢

【问题讨论】：

标签： c++ opencv ubuntu raspberry-pi cross-compiling

【解决方案1】：

我意识到这是一个老问题，但为了记录，我能够从 Ubuntu 交叉编译我的 OpenCV 项目。

在我的例子中，我使用了 github 上预构建的树莓派工具链：https://github.com/raspberrypi/tools 在 Ubuntu 12.0.4 上。我采用了将本地库（安装了 OpenCV 和 PiCamera 库）从目标 Raspberry Pi 系统复制到 Ubuntu 实例的方法，并使用了您在帖子中提到的 CMAKE_TOOLCHAIN_FILE 支持。

但是，我必须克服某些问题，我在这篇文章中介绍了这些问题：https://solderspot.wordpress.com/2016/02/04/cross-compiling-for-raspberry-pi-part-ii

关键点是：

CMAKE_FIND_ROOT_PATH 无效。我必须使用 CMAKE_SYSROOT。
在我的 CMakeLists.txt 文件中，我仍然必须在任何路径前显式添加我在本机文件系统上复制的文件夹的路径。
我还需要从 CMAKE_TOOLCHAIN_FILE 中显式指定动态库链接路径，因为工具链无法正确解析 /usr/etc/ld.so.conf 文件。

我目前唯一无法解决的问题与 Jessie 的 Raspbian 版本有关，因为 OpenCV 使用了 gcc/g++ 4.9 版本的工具链不支持的 gcc/g++ 4.9 功能。看起来工具链将在不久的将来增强以支持 4.9。

我最终的 CMAKE_TOOLCHAIN_FILE 是：

SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION 1)

SET(DEVROOT $ENV{HOME}/pidev)
SET(PIROOT ${DEVROOT}/piroot)
SET(PITOOLS ${DEVROOT}/pitools)

SET(TOOLROOT ${PITOOLS}/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64)

# specify the cross compiler
SET(CMAKE_C_COMPILER   ${TOOLROOT}/bin/arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER ${TOOLROOT}/bin/arm-linux-gnueabihf-g++)

SET(FLAGS "-Wl,-rpath-link,${PIROOT}/opt/vc/lib -Wl,-rpath-link,${PIROOT}/lib/arm-linux-gnueabihf -Wl,-rpath-link,${PIROOT}/usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,${PIROOT}/usr/local/lib")

UNSET(CMAKE_C_FLAGS CACHE)
UNSET(CMAKE_CXX_FLAGS CACHE)

SET(CMAKE_CXX_FLAGS ${FLAGS} CACHE STRING "" FORCE)
SET(CMAKE_C_FLAGS ${FLAGS} CACHE STRING "" FORCE)

SET(CMAKE_SYSROOT ${PIROOT})
SET(CMAKE_FIND_ROOT_PATH ${PIROOT})


# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

我的主目录中有一个 pidev 文件夹，在该 piroot 下有一个来自我的 pi 主机的 /usr /opt /etc 和 /lib 的副本，并且pitools 是我上面引用的 GitHub 工具链的克隆。

我的项目的 CMakeLists.txt 文件是：

cmake_minimum_required(VERSION 2.8)
project( PiCamCVTest )
SET(COMPILE_DEFINITIONS -Werror)

include_directories(SYSTEM ${PIROOT}/opt/vc/include ${PIROOT}/opt/vc/include/interface/vcos/pthreads ${PIROOT}/opt/vc/include/interface/vmcs_host/linux )
link_directories( ${PIROOT}/opt/vc/lib )
add_executable(PiCamCVTest main.cpp camera.cpp cameracontrol.cpp graphics.cpp)

target_link_libraries(PiCamCVTest libmmal_core.so libmmal_util.so libmmal_vc_client.so libvcos.so librt.so libbcm_host.so GLESv2 EGL libopencv_core.so libopencv_imgproc.so)

希望这会有所帮助。

【讨论】：

你从 pi 那里拿到 opencv 库的副本？我在我的 pi 上运行 sudo apt-get install libopencv-dev 并成功安装。但我在/usr/lib、/lib、/usr/local/lib 中都找不到任何 libopencv*.so。我只在/usr/include/opencv 和/usr/include/opencv2 中找到头文件。但是，我很确定我可以用 opencv 在 pi 上本地编译，只是找不到库在哪里。

【解决方案2】：

您可以通过以下链接将 Qt (c++) 与 OpenCV 交叉编译到树莓派： http://aplacetogeek.wordpress.com/qt-opencv-v4l-cross-compiling-raspberry-pi-beagle-bone/

此链接应该为您提供有关如何使您的系统能够为树莓派交叉编译的所有必要信息。当您按照链接所说的方式设置了所有内容后，如果您愿意，我认为您也可以使用 opencv 库在没有 Qt 的情况下交叉编译 c++。

【讨论】：