为什么我的 openCL 构建在 OS X 上失败？

Question

我在 OS X 10.7 Lion 上并安装了所有开发工具，但是当我在一个相对简单的程序上运行 GCC 时，只需直接 C 并调用诸如 clCreateProgramFromSource 之类的 openCL 函数，我得到以下错误列表：

Undefined symbols for architecture x86_64:
  "_CreateContext", referenced from:
    _build_kernel in ccFuZYMI.o
  "_GetDevices", referenced from:
    _build_kernel in ccFuZYMI.o
  "_CreateCommandQueue", referenced from:
    _build_kernel in ccFuZYMI.o
  "_clCreateProgramWithSource", referenced from:
    _build_kernel in ccFuZYMI.o
  "_clBuildProgram", referenced from:
    _build_kernel in ccFuZYMI.o
  "_clCreateKernel", referenced from:
    _build_kernel in ccFuZYMI.o
  "_clCreateBuffer", referenced from:
    _build_kernel in ccFuZYMI.o
  "_clEnqueueWriteBuffer", referenced from:
    _sync_run_kernel in ccFuZYMI.o
  "_clSetKernelArg", referenced from:
    _sync_run_kernel in ccFuZYMI.o
  "_clEnqueueNDRangeKernel", referenced from:
    _sync_run_kernel in ccFuZYMI.o
  "_clEnqueueReadBuffer", referenced from:
    _sync_run_kernel in ccFuZYMI.o
  "_clReleaseContext", referenced from:
    _destroy_kernel in ccFuZYMI.o
  "_clReleaseCommandQueue", referenced from:
    _destroy_kernel in ccFuZYMI.o
  "_clReleaseMemObject", referenced from:
    _destroy_kernel in ccFuZYMI.o
  "_clReleaseProgram", referenced from:
    _destroy_kernel in ccFuZYMI.o
  "_clReleaseKernel", referenced from:
    _destroy_kernel in ccFuZYMI.o
ld: symbol(s) not found for architecture x86_64

还有一些其他警告，但在计算阶段没有其他错误。这是（如果不清楚）链接器错误。在创建目标文件时，它似乎能够从头文件中看到定义，因为它给了我关于不兼容指针类型的警告。

我尝试粘贴到一个 xcode 项目中，但我得到完全相同的错误。我试过only other OS X Lion / OpenCL result's solution，但没有帮助。

Answer 1

在我看来，您没有链接到 OpenCL 库。您可以发布您尝试使用的链接命令吗？如果没有这些信息，只需从臀部射击：添加-framework OpenCL。

Answer 2

看起来您缺少 OpenCL 框架 - 试试：

$ gcc -Wall foo.c -framework OpenCL -o foo