使用 Clang 编译基于 OpenCV 的项目

Compiling OpenCV based project using Clang

本文关键字：OpenCV 项目 Clang 编译 使用      更新时间：2023-10-16

我刚刚在我的 64 位 ubuntu 盒子上的 clang 3.4 上进行了全新安装，我正在尝试编译一个使用 OpenCV 的项目。Clang和OpenCV库都是使用apt-get从ubuntu存储库安装的。使用 GCC 构建工作正常。生成过程由 CMake 管理。

当我使用 Clang 运行构建时，出现以下错误：

/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clReleaseMemObject@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetKernelWorkGroupInfo@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clFlush@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined  reference to `clReleaseKernel@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clReleaseCommandQueue@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clReleaseEvent@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueWriteBuffer@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueCopyBufferRect@OPENCL_1.1'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateBuffer@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clFinish@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clBuildProgram@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueFillBuffer@OPENCL_1.2'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clSetKernelArg@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateProgramWithBinary@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateContext@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clReleaseProgram@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetDeviceIDs@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetEventProfilingInfo@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueUnmapMemObject@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clRetainCommandQueue@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateProgramWithSource@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateKernel@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetDeviceInfo@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clReleaseContext@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clRetainContext@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateCommandQueue@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueNDRangeKernel@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clWaitForEvents@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueReadBuffer@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueMapBuffer@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clCreateImage@OPENCL_1.2'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueWriteBufferRect@OPENCL_1.1'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueCopyBufferToImage@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetProgramBuildInfo@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetPlatformIDs@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clGetProgramInfo@OPENCL_1.0'
/usr/lib64/gcc/x86_64-linux-gnu/4.8/../../../../lib64/libopencv_ocl.so: undefined reference to `clEnqueueReadBufferRect@OPENCL_1.1'

它们似乎与OpenCL相关。如何修复这些链接器错误？

尝试手动编译它。有时，通过数据包管理器安装依赖项时会出现一些问题。CMake 是一个非常强大的工具。它对编译器、平台等执行检查。

安装 cmake（通过数据包管理器）并从存储库下载最后一个 OpenCV 源代码：

https://github.com/Itseez/opencv

并在外壳上键入用于制作蛋糕的标准命令：

$ cd opencv_path
$ mkdir build
$ cd build
$ cmake ..
$ make

执行蛋糕也可以输出一些重要信息，最好阅读它们：）

适用于opencv的CMake脚本还为您提供了配置CUDA和OpenCL的好方法！

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