linux交叉编译和动态库/链接 [英] linux cross compiling and dynamic libraries / linking

问题描述

我正在尝试为BeagleBoard开发. 因此，我安装了CodeSourcery Sourcery_G ++ _ Lite工具链.

i'm trying to develop for the BeagleBoard. Therefore i installed the CodeSourcery Sourcery_G++_Lite Toolchain.

我想使用opencv库.因此，我将源代码下载到我的Ubuntu开发系统中，使用gcc编译为共享库并安装了该库. 当我为x86体系结构构建helloworld应用程序时，一切都很好.

I want to use the opencv library. So I downloaded the sources to my Ubuntu devolepment system, compiled with gcc as shared library and installed the library. When i build a helloworld-application for the x86-Architecture, everything is fine.

现在，我想与用于ARM体系结构的其他工具链一起编译相同的应用程序.

Now, i want to compile the same application with the other toolchain for the ARM-Architecture.

我在编译/链接时收到这些警告/错误:

I get these warnings/erros while compiling/linking:

john@ubuntu:~/Downloads/BeagleTest$ arm-none-linux-gnueabi-g++ -c ImageProcessing.cpp -o ImageProcessing.o -I/usr/local/include
cc1plus: warning: include location "/usr/local/include" is unsafe for cross-compilation

john@ubuntu:~/Downloads/BeagleTest$ arm-none-linux-gnueabi-g++ -c Main.cpp -o Main.o -I/usr/local/include
cc1plus: warning: include location "/usr/local/include" is unsafe for cross-compilation

john@ubuntu:~/Downloads/BeagleTest$ arm-none-linux-gnueabi-g++ -oApplication -L/usr/local/lib Main.o ImageProcessing.o -lopencv_core
/usr/local/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-linux-gnueabi/4.2.1/../../../../arm-none-linux-gnueabi/bin/ld: warning: library search path "/usr/local/lib" is unsafe for cross-compilation
/usr/local/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-linux-gnueabi/4.2.1/../../../../arm-none-linux-gnueabi/bin/ld: skipping incompatible /usr/local/lib/libopencv_core.so when searching for -lopencv_core
/usr/local/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-linux-gnueabi/4.2.1/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lopencv_core
collect2: ld returned 1 exit status

很明显，im使用与x86体系结构相同的包含目录和库路径.这是行不通的.但是我该怎么办?我必须交叉编译opencv库吗?

Obviously, im using the same include-directories and library-pathes like im using for the x86-Architecture. This does not work. But what do i have to do? Do i have to cross compile the opencv-library?

推荐答案

必须交叉编译库，并且必须确保在链接时找到正确的库.如果那不能自动工作，您可能需要看一下gcc的--sysroot命令行开关.

Libraries have to be cross compiled and you have to make sure the correct library is found when linking. If that shouldn't work automatically you may want to take a look at the --sysroot command line switch of gcc.

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