英文:
How can I compile OpenCL kernels written in OpenCL-C++?
问题
我很想能够在我的OpenCL内核中使用C++。
然而，OpenCL 3.0主机端API文档，第5.8.1节，说道：
> 5.8.1. 创建程序对象
>
> 要为上下文创建一个程序对象并将源代码加载到该对象中，请调用以下函数
>
> cl_program clCreateProgramWithSource(
> cl_context context,
> cl_uint count,
> const char** strings,
> const size_t* lengths,
> cl_int* errcode_ret);
>
... 省略部分 ...
>
> 由字符串指定的源代码可以是OpenCL C程序源代码、头文件或支持在线编译器的自定义设备的实现定义源代码。但是，OpenCL C++不受此接口支持作为在线编译的内核语言。
那么，我应该如何编译OpenCL C++内核代码呢？我找不到另一个接受此内容作为输入的API函数。
英文:
I would love to be able to use C++ in my OpenCL kernels.
However, the OpenCL 3.0 host-side API documentation, Section 5.8.1, says:
> 5.8.1. Creating Program Objects
>
> To creates a program object for a context and load source code into that object, call the function
>
> cl_program clCreateProgramWithSource(
> cl_context context,
> cl_uint count,
> const char** strings,
> const size_t* lengths,
> cl_int* errcode_ret);
>
... snip ...
>
> The source code specified by strings is either an OpenCL C program
> source, header or implementation-defined source for custom devices
> that support an online compiler. OpenCL C++ is not supported as an
> online-compiled kernel language through this interface.
So how am I supposed to compile OpenCL C++ kernel code? I can't find another API function that takes that as input.
答案1
得分: 1
简要概括: 这确实是如何编译OpenCL-C++代码的方式，但只在特定条件下有效。
详细信息：
对于OpenCL-C++程序的即时编译支持是一项OpenCL扩展，不受核心API支持或提供。
如果OpenCL实现支持 cl_ext_cxx_for_opencl 扩展，那么：
您可以通过查询设备来确定特定设备的编译器是否支持OpenCL C++，使用cl_device_info代码的CL_DEVICE_CXX_FOR_OPENCL_NUMERIC_VERSION_EXT值。
假设设备编译器确实支持OpenCL C++，然后您可以将OpenCL代码传递给 clCreateProgramWithSource()。但是，您必须在clCompileProgram() / clBuildProgram()的命令行参数中明确包含-cl-std=CLC++，以使编译器实际解释您的程序为OpenCL C++。
在您的OpenCL-C++程序中，__OPENCL_CPP_VERSION__ 的值应与主机端的CL_DEVICE_CXX_FOR_OPENCL_NUMERIC_VERSION_EXT设备属性的值相符。
英文:
tl;dr: That is how you compile OpenCL-C++ code, but it only works under certain conditions.
Details:
Support for JIT compilation of OpenCL-C++ programs is an OpenCL extension, and is not supported/provided for by the core API.
If an OpenCL implementation support the cl_ext_cxx_for_opencl extension, then:
You start by querying your device to determine whether the compiler for that specific device supports OpenCL C++. Use the CL_DEVICE_CXX_FOR_OPENCL_NUMERIC_VERSION_EXT value for the cl_device_info code.
Assuming the device compiler does support OpenCL C++, you then can pass OpenCL code to clCreateProgramWithSource(). But you will have to explicitly have-cl-std=CLC++ as part of the command-line arguments to clCompileProgram() / clBuildProgram(), to actually have the compiler interpret your programs as OpenCL C++.
Within your OpenCL-C++ program, the value of the __OPENCL_CPP_VERSION__ is supposed to agree with the value of the CL_DEVICE_CXX_FOR_OPENCL_NUMERIC_VERSION_EXT device property on the host side.
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