c++ error 2019LNK2019: 无法解析的外部符号_mainfatal error 2019LNK112

来源：蜘蛛抓取(WebSpider) 时间：2018-03-16 17:12 标签： vs error lnk2019
c++ - Unresolved external symbols in beginners CUDA program - Stack Overflow
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I create a new Win32 Console App as an empty project
I am running Windows 7 64bit with Visual Studio 2008 C++.
I am trying to get the sample code from the bottom of this article to build:
I add CUDA Build Rule v2.3.0 to the project's custom build rules.
It is the only thing with a checkbox in the available rule files list
I create moveArrays.cu in the Source Files (folder/filter???)
In that file I add the following code:
// moveArrays.cu
// demonstrates CUDA interface to data allocation on device (GPU)
// and data movement between host (CPU) and device.
#include &stdio.h&
#include &assert.h&
#include &cuda.h&
int main(void)
float *a_h, *b_h;
// pointers to host memory
float *a_d, *b_d;
// pointers to device memory
int N = 14;
// allocate arrays on host
a_h = (float *)malloc(sizeof(float)*N);
b_h = (float *)malloc(sizeof(float)*N);
// allocate arrays on device
cudaMalloc((void **) &a_d, sizeof(float)*N);
cudaMalloc((void **) &b_d, sizeof(float)*N);
// initialize host data
for (i=0; i&N; i++) {
a_h[i] = 10.f+i;
b_h[i] = 0.f;
// send data from host to device: a_h to a_d
cudaMemcpy(a_d, a_h, sizeof(float)*N, cudaMemcpyHostToDevice);
// copy data within device: a_d to b_d
cudaMemcpy(b_d, a_d, sizeof(float)*N, cudaMemcpyDeviceToDevice);
// retrieve data from device: b_d to b_h
cudaMemcpy(b_h, b_d, sizeof(float)*N, cudaMemcpyDeviceToHost);
// check result
for (i=0; i&N; i++)
assert(a_h[i] == b_h[i]);
// cleanup
free(a_h); free(b_h);
cudaFree(a_d); cudaFree(b_d);
When I build I get these errors:
1>------ Build started: Project: CUDASandbox, Configuration: Debug x64 ------
1>Linking...
1>moveArrays.cu.obj : error LNK2019: unresolved external symbol cudaFree referenced in function main
1>moveArrays.cu.obj : error LNK2019: unresolved external symbol cudaMemcpy referenced in function main
1>moveArrays.cu.obj : error LNK2019: unresolved external symbol cudaMalloc referenced in function main
1>moveArrays.cu.obj : error LNK2019: unresolved external symbol __cudaUnregisterFatBinary referenced in function __cudaUnregisterBinaryUtil
1>moveArrays.cu.obj : error LNK2019: unresolved external symbol __cudaRegisterFatBinary referenced in function __sti____cudaRegisterAll_45_tmpxft_00000_6_moveArrays_cpp1_ii_main
1>D:\Stuff\Programming\Visual Studio 2008\Projects\CUDASandbox\x64\Debug\CUDASandbox.exe : fatal error LNK1120: 5 unresolved externals
1>Build log was saved at "file://d:\Stuff\Programming\Visual Studio 2008\Projects\CUDASandbox\CUDASandbox\x64\Debug\BuildLog.htm"
1>CUDASandbox - 6 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
I can compile and run the example CUDA programs that came with the SDK.
I know I am missing something simple here, but what is it?
4,2951664110
I guess you are missing to link to the correct library.
Make sure you have the CUDA library added under "Configuration Properties->Linker->Input".
Two things are needed:
Add cuda path:
Go: "Configuration Properties->Linker->General->Additional Libary Directories" and add $(CudaToolkitLibDir) to the list.
Add cuda realtime library:
Go: "Solution Properties->Linker->Input->Additional Dependencies" and add cudart.lib to the list.
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错误 2 error LNK1120: 1 个无法解析的外部命令
编译通过了，但是生成时出错了！
我有更好的答案
但是找不到实现.另一个原因是函数的声明和实现都放在头文件中了，一般要把声明放头文件中，实现放在cpp文件中。2，只有这个函数的声明。有两个原因，连接不成功，没有包含这个函数的实现(实现一般放在cpp文件中的)。所以只能通过编译这个问题的原因是有头文件。这样每个#include该头文件的文件都会有一份该函数的实现，连接的时候，连接器不知道连接哪一个实现，于是报错：1.只包含了头文件
高级软件工程师
但是找不到实现.另一个原因是函数的声明和实现都放在头文件中了，一般要把声明放头文件中，实现放在cpp文件中。2，只有这个函数的声明。有两个原因，连接不成功，没有包含这个函数的实现(实现一般放在cpp文件中的)。所以只能通过编译这个问题的原因是有头文件。这样每个#include该头文件的文件都会有一份该函数的实现，连接的时候，连接器不知道连接哪一个实现，于是报错：1.只包含了头文件
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