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POTrouble with building Cuda programme in VS2008: LNK2019
 

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  1. POTrouble with building Cuda programme in VS2008: LNK2019
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    <p>I am having some trouble with building my programme. I am working on Windows 7 professional 32-bit with Visual Studio 2008. I have the Cuda SDK and my project is set up with all links to cudart.lib etc. My problem is when I try to build my project it returns the following errors:</p> <blockquote> <p>1>crowdSim.obj : error LNK2019: unresolved external symbol _setParameters referenced in function "protected: void __thiscall Crowd::_create(int)" (?_create@Crowd@@IAEXH@Z) 1>crowdSim.obj : error LNK2019: unresolved external symbol _mapBuffer referenced in function "protected: void __thiscall Crowd::_create(int)" (?_create@Crowd@@IAEXH@Z) 1>crowdSim.obj : error LNK2019: unresolved external symbol _allocToDevice referenced in function "protected: void __thiscall Crowd::_create(int)" (?_create@Crowd@@IAEXH@Z) 1>crowdSim.obj : error LNK2019: unresolved external symbol _registerBuffer referenced in function "protected: void __thiscall Crowd::_create(int)" (?_create@Crowd@@IAEXH@Z) 1>../../bin/win32/Debug/crowd.exe : fatal error LNK1120: 4 unresolved externals</p> </blockquote> <p>It seems my problem is with how I am setting up my "allocToDevice", "mapBuffer", "setParameters", and "registerBuffer" methods since if I comment these out I can build the project no problem.</p> <p>I have defined the methods in the following files:</p> <p>crowdSim.cuh:</p> <pre><code> extern "C" { void checkCUDAError(const char *msg); void setParameters(SimParams *hostParams); void registerBuffer(uint vbo); void allocToDevice(void **ptr, int memSize); void mapBuffer(void **ptr, uint vbo); } </code></pre> <p>crowdSim.cu:</p> <pre><code>#include &lt;cstdlib.h&gt; #include &lt;cstdio.h&gt; #include &lt;string.h&gt; #include &lt;cuda_gl_interop.h&gt; // includes, kernels #include "crowd_kernel.cu" extern "C" { void checkCUDAError(const char *msg) { cudaError_t err = cudaGetLastError(); if( cudaSuccess != err) { fprintf(stderr, "Cuda error: %s: %s.\n", msg, cudaGetErrorString( err) ); exit(-1); } } void setParameters(SimParams *hostParams) { // copy parameters to constant memory cudaMemcpyToSymbol(params, hostParams, sizeof(SimParams)); } void registerBuffer(uint vbo) { cudaGLRegisterBufferObject(vbo); } void allocToDevice(void **ptr, size_t memSize) { cudaMalloc(ptr, memSize); } void mapBuffer(void **ptr, uint vbo) { cudaGLMapBufferObject(ptr, vbo); } } //extern "C" </code></pre> <p>and they are only called from the _create method in my "Crowd" class from crowdSim.cpp:</p> <pre><code>#include &lt;math.h&gt; #include &lt;memory.h&gt; #include &lt;cstdio&gt; #include &lt;cstdlib&gt; #include &lt;GL/glew.h&gt; #include "crowdSim.h" #include "crowdSim.cuh" #include "crowd_kernel.cuh" Crowd::Crowd(uint crowdSize) : //numP(crowdSize), hPos(0), hVel(0), dPosIn(0), dVelIn(0), dPosOut(0), dVelOut(0) { params.numBodies = crowdSize; _create(crowdSize); } Crowd::~Crowd() { //_remove(); crowdSize = 0; } uint Crowd::newVBO(uint size) { GLuint vbo; // glGenBuffers(1, &amp;vbo); // glBindBuffer(GL_ARRAY_BUFFER, vbo); // glBufferData(GL_ARRAY_BUFFER, size, 0, GL_DYNAMIC_DRAW); // glBindBuffer(GL_ARRAY_BUFFER, 0); return vbo; } void Crowd::_create(int numPeople) { crowdSize = numPeople; unsigned int memSize = sizeof(float) * crowdSize * 4; hPos = new float[crowdSize*4]; hVel = new float[crowdSize*4]; hPos = (float*) malloc(memSize); hVel = (float*) malloc(memSize); posVbo = newVBO(memSize); registerBuffer(posVbo); allocToDevice((void**) &amp;dPosIn, memSize); allocToDevice((void**) &amp;dPosOut, memSize); allocToDevice((void**) &amp;dVelIn, memSize); allocToDevice((void**) &amp;dVelOut, memSize); mapBuffer((void**)&amp;dPosVbo, posVbo); setParameters(&amp;params); } </code></pre> <p>I feel like I am missing something very basic here but I can't work out what so any help would be great!</p>
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