Question

在Ubuntu 10.10中编译这个hello world示例时

这是来自CUDA by Example，第3章（没有提供编译说明＆gt;：@）

#include <iostream>

__global__ void kernel (void){


}

int main(void){

    kernel <<<1,1>>>();
        printf("Hellow World!\n");
    return 0;

}

我明白了：

$ nvcc -lcudart hello.cu hello.cu（11）：错误：标识符“printf”是   未定义

在编译中检测到1个错误   “/tmp/tmpxft_00007812_00000000-4_hello.cpp1.ii”。

为什么呢？该代码应该如何编译？

Answer 1

您需要为stdio.h添加iostream而不是std::cout（适用于printf个内容）（请参阅man 3 printf）。我找到了本书here的源代码。

chapter03/hello_world.cu实际上是：


/*
 * Copyright 1993-2010 NVIDIA Corporation.  All rights reserved.
 *
 * NVIDIA Corporation and its licensors retain all intellectual property and 
 * proprietary rights in and to this software and related documentation. 
 * Any use, reproduction, disclosure, or distribution of this software 
 * and related documentation without an express license agreement from
 * NVIDIA Corporation is strictly prohibited.
 *
 * Please refer to the applicable NVIDIA end user license agreement (EULA) 
 * associated with this source code for terms and conditions that govern 
 * your use of this NVIDIA software.
 * 
 */


#include "../common/book.h"

int main( void ) {
    printf( "Hello, World!\n" );
    return 0;
}

../common/book.h包括stdio.h。

README.txt文件详细说明了如何编译示例：


The vast majority of these code examples can be compiled quite easily by using 
NVIDIA's CUDA compiler driver, nvcc. To compile a typical example, say 
"example.cu," you will simply need to execute:

> nvcc example.cu

Answer 2

问题是编译器不知道在哪里可以找到printf函数。它需要知道在哪里找到它。 include指令用于告诉编译器在哪里找到它。

#include "stdio.h"

int main(void) {
  printf("Hello World!\n");
  return 0;
}

修复后，它将起作用：

$ nvcc hello_world.cu
$ ls
a.out  hello_world.cu
$ a.out
Hello World!

麻烦编译helloworld.cu

2 个答案: