Question

我是一个关于OpenCL编程的新手，我想运行一个简单的程序，该程序位于＆＃34; OpenCL并行编程开发手册＆＃34;中。实际上，我想通过这个简单的编程来查询OpenCl平台：

#include <stdio.h>
#include <stdlib.h>
#include <CL/cl.h>

void displayPlatformInfo(cl_platform_id id,
                     cl_platform_info param_name,
                     const char* paramNameAsStr) {
    cl_int error = 0;
    size_t paramSize = 0;
    error = clGetPlatformInfo( id, param_name, 0, NULL, &paramSize );
    char* moreInfo = (char*)malloc( sizeof(char) * paramSize);
    error = clGetPlatformInfo( id, param_name, paramSize,moreInfo, NULL );
    if (error != CL_SUCCESS ) {
        perror("Unable to find any OpenCL platform information");
           return;
    }
    printf("%s: %s\n", paramNameAsStr, moreInfo);
}
int main() {
    /* OpenCL 1.2 data structures */
    cl_platform_id* platforms;
    /* OpenCL 1.1 scalar data types */
    cl_uint numOfPlatforms;
    cl_int error;
    /*
Get the number of platforms
Remember that for each vendor's SDK installed on the
Computer, the number of available platform also
*/
    error = clGetPlatformIDs(0, NULL, &numOfPlatforms);
    if(error < 0) {
        perror("Unable to find any OpenCL platforms");
        exit(1);
    }
    // Allocate memory for the number of installed platforms.
    // alloca(...) occupies some stack space but is
    // automatically freed on return
    platforms = (cl_platform_id*) malloc(sizeof(cl_platform_id)
                                     * numOfPlatforms);
    printf("Number of OpenCL platforms found: %d\n",
       numOfPlatforms);
    // We invoke the API 'clPlatformInfo' twice for each
    // parameter we're trying to extract
    // and we use the return value to create temporary data
    // structures (on the stack) to store
    // the returned information on the second invocation.
    for(cl_uint i = 0; i < numOfPlatforms; ++i) {
        displayPlatformInfo( platforms[i],
                         CL_PLATFORM_PROFILE,
                         "CL_PLATFORM_PROFILE" );
        displayPlatformInfo( platforms[i],
                         CL_PLATFORM_VERSION,
                         "CL_PLATFORM_VERSION" );
        displayPlatformInfo( platforms[i],
                         CL_PLATFORM_NAME,
                         "CL_PLATFORM_NAME" );
        displayPlatformInfo( platforms[i],
                         CL_PLATFORM_VENDOR,
                         "CL_PLATFORM_VENDOR" );
        displayPlatformInfo( platforms[i],
                         CL_PLATFORM_EXTENSIONS,
                         "CL_PLATFORM_EXTENSIONS" );
    }
    return 0;
}

我在Qt Creator上，关于视频我的电脑配置是：NVIDIA GEFORCE GT 635M＆amp; Windows 8.1下的英特尔（R）HD Graphics 4000

我的.pro文件是：

SOURCES += \
    main.cpp

QMAKE_CXXFLAGS += -std=c++0x

INCLUDEPATH += \
    $$quote(C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v6.5/include)

LIBS += \
    $$quote(C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v6.5/lib/x64/OpenCL.lib)

由于文件路径中的空格。所以，我的问题是：为什么，当我编译我的项目时，问题＆＃34;未定义引用clGetPlatformInfo@20'" appear? There's 2 others errors (one which exactly the same, the other is "undefined reference to clGetPlatformIDs @ 12＆＃39;＆＃34;）

我在网上搜索了很多天，但我无法找到答案（这些问题已在Linux或Mac上得到答案。）

提前致谢！

马修

Answer 1

看起来您正在尝试构建32位应用程序，同时使用64位版本的OpenCL.lib进行链接：

C：/ Program Files / NVIDIA GPU Computing Toolkit / CUDA / v6.5 / lib / x64 /OpenCL.lib

因此，要么以64位模式构建应用程序，要么修复路径以指向32位版本的OpenCL.lib。

Answer 2

感谢您的回答。你是对的，但我正在尝试构建64位版本，而使用32位版本，它可以工作！

再次感谢，它已经解决了！

编译错误：未定义参考＆＃39; clGetPlatformInfo @ 20＆＃39;

2 个答案: