[英]How to cross compile Raspberry Pi project on x86_64? (missing *.so due to invalid path)
I am cross compiling Raspberry Pi project on x86_64/Ubuntu 13.04. 我正在x86_64 / Ubuntu 13.04上交叉编译Raspberry Pi项目。 After invoking cmake with:
调用cmake后:
cmake -DCMAKE_TOOLCHAIN_FILE=./Toolchain-raspberry.pi .
and then make , linking fails: 然后make ,链接失败:
/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
...
The problem is that cmake generated Makefile invokes linker in the following way: 问题是cmake生成的Makefile以下列方式调用链接器:
/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
and it does not specify paths to those shared libraries. 它没有指定这些共享库的路径。 However, if I manually add --sysroot /opt/rpi-rootfs/ flag to the command above, then linking succeeds.
但是,如果我手动将--sysroot / opt / rpi-rootfs / flag添加到上面的命令,则链接会成功。
What is the recommended way to get cmake to specify the right paths to the shared libraries when cross compiling? 在交叉编译时,建议让cmake指定共享库的正确路径的方法是什么?
Here is my Toolchain-raspberry.pi file: 这是我的Toolchain-raspberry.pi文件:
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)
And this is my CMakeList.txt file: 这是我的CMakeList.txt文件:
cmake_minimum_required(VERSION 2.8)
project(watson)
add_executable(Watson main.cpp)
find_package(OpenCV REQUIRED)
target_link_libraries(Watson ${OpenCV_LIBS})
The /usr and /lib directories from the target are rsync'ed to /opt/rpi-rootfs/ and all the necessary *.so files are there. 目标中的/ usr和/ lib目录是rsync到/ opt / rpi-rootfs /,并且所有必需的* .so文件都在那里。 After reading cmake documentation, I would have expected that setting CMAKE_FIND_ROOT_PATH would solve this problem, but apparently not.
在阅读cmake文档后,我原本期望设置CMAKE_FIND_ROOT_PATH可以解决这个问题,但显然没有。 I am using cmake version 2.8.10.1.
我使用的是cmake版本2.8.10.1。
By my pratice, 通过我的实践,
INCLUDE_DIRECTORIES(/opt/rpi-rootfs/usr/include)
LINK_DIRECTORIES(
/opt/rpi-rootfs/usr/lib
/opt/rpi-rootfs/lib
)
will work 将工作
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