c++ - 在 Ubuntu 上为 Raspberry Pi 交叉编译 opencv 项目

Question

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，交叉编译器在 Raspberry Pi 上运行

---

我的问题是什么:

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|

我想我也需要在 ubuntu 上交叉编译 OpenCV。从我的交叉编译器我还有一个工具链

# 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)

使用这个工具链，我尝试用这个命令交叉编译 OpenCV:

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

在执行 make 命令后，它会编译到 27%。它因这个错误而停止

[ 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

我试图将在 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。我在编译时遇到很多错误

||=== 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 一起工作？我只想在 ubuntu 上编译，把程序复制到 Pi 上运行。

非常感谢

Answer 1

我意识到这是一个老问题，但作为记录，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 raspberry pi 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 实例并使用 CMAKE_TOOLCHAIN_FILE 支持的方法，就像您在帖子中提到的那样。

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

关键点是:

1. CMAKE_FIND_ROOT_PATH 没有效果。我不得不使用 CMAKE_SYSROOT。

2. 在我的 CMakeLists.txt 文件中，我仍然必须明确地在任何路径前加上我通过 native 文件系统复制到的文件夹的路径。

3. 我还需要从 CMAKE_TOOLCHAIN_FILE 中明确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是与 Raspbian 的 Jessie 版本有关，因为 OpenCV 使用了 gcc/g++ 4.8 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得到增强以支持 4.9。

我的最终 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，在那个 piroot 下有一个来 self 的 pi 主机的/usr/opt/etc 和/lib 的拷贝，并且pitools 是我上面提到的 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)

希望这对您有所帮助。