在Ubuntu 11.10上编译OpenCV2.3.1时，出现链接器错误

问题描述

我试图在Ubuntu 11.10上按照中的说明编译OpenCV版本2.3.1。我收到以下错误。不能理解发生了什么... /usr/local/lib/libavcodec.a 存在，但链接器无法链接到它，或其他？

错误：

  [20％]内置目标pch_Generate_opencv_highgui 
链接CXX共享库../../lib/libopencv_highgui.so 
 / usr / bin / ld：/usr/local/lib/libavcodec.a(avpacket.o）：重定位R_X86_64_32S针对`av_destruct_packet'
在创建共享对象时不能使用;重新编译-fPIC 
 /usr/local/lib/libavcodec.a：无法读取符号：错误值
 collect2：ld返回1退出状态
  

解决方案

问题是你试图链接 libopencv_highgui.so 与 libavcodec.a 。后者是从没有 -fPIC （这是很常见）编译的代码构建的，并且这样的代码不能链接到共享库上 x86_64 。

您的选择是：

• 获得 libavcodec.so 并安排链接到它


• 删除 libavcodec code> -lavcodec 。

只需安装包。

libopencv_highgui.so 需要 libavcodec 到在运行时可用。您可以通过将主可执行文件与 libavcodec （归档或共享变体）链接来实现。

I'm trying to compile OpenCV version 2.3.1 on an Ubuntu 11.10 following instructions described here. I'm getting following error. Can't understand what is happening... /usr/local/lib/libavcodec.a exists but linker can't link against it, or something else?

error:

[ 20%] Built target pch_Generate_opencv_highgui
Linking CXX shared library ../../lib/libopencv_highgui.so
/usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): relocation R_X86_64_32S against `av_destruct_packet'
can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libavcodec.a: could not read symbols: Bad value
collect2: ld returned 1 exit status

解决方案

The problem is that you are attempting to link libopencv_highgui.so with libavcodec.a. The latter is built from code compiled without -fPIC (which is quite usual), and such code can not be linked into shared libraries on x86_64.

Your choices are:

• Obtain libavcodec.so and arrange to link against it, or
• Remove libavcodec or -lavcodec from the link line completely.

For the first, you most likely just need to install libavcodec-dev package.

If you do the second, you will still have to arrange for symbols that libopencv_highgui.so needs from libavcodec to be available at runtime. You can achieve that by linking the main executable with libavcodec (either archive or shared variant).

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