I am having a bit of a quandary on my project. The language is C++, the editor Visual Studio 2012, and it is supposed to be a ray casting renderer once it will be finished (the ray casting bits are still missing). For this, I am using the math library Eigen. However, I get linking errors when I try to build. I have not used the C++ language much in the past, and the research done on this error has not helped me.
Here is the output from the compiler:
1>------ Build started: Project: TX52-3DStereo-RT-CUDA, Configuration: Debug x64 ------
1>Build started 06/12/2013 10:55:56.
1>InitializeBuildStatus:
1> Touching "x64\Debug\TX52-3DStereo-RT-CUDA.unsuccessfulbuild".
1>AddCudaCompilePropsDeps:
1>Skipping target "AddCudaCompilePropsDeps" because all output files are up-to-date with respect to the input files.
1>CudaBuild:
1> Compiling CUDA source file kernel.cu...
1>
1> C:\Users\Satanikas\Documents\Visual Studio 2012\Projects\TX52-3DStereo-RT-CUDA\TX52-3DStereo-RT-CUDA>"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\bin\nvcc.exe" -gencode=arch=compute_10,code=\"sm_10,compute_10\" --use-local-env --cl-version 2012 -ccbin "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\x86_amd64" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\include" -G --keep-dir x64\Debug -maxrregcount=0 --machine 64 --compile -cudart static -g -DWIN64 -D_DEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /Od /Zi /RTC1 /MDd " -o x64\Debug\kernel.cu.obj "C:\Users\Satanikas\Documents\Visual Studio 2012\Projects\TX52-3DStereo-RT-CUDA\TX52-3DStereo-RT-CUDA\kernel.cu"
1>c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Core/arch/SSE/PacketMath.h(169): warning : controlling expression is constant
1>
1>c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Core/Block.h(102): error : "operator=" has already been declared in the current scope
1> detected during instantiation of class "Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel> [with XprType=VectorType, BlockRows=<expression>, BlockCols=<expression>, InnerPanel=false]"
1> c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Core/VectorBlock.h(58): here
1>
1>c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Core/Ref.h(122): error : "operator=" has already been declared in the current scope
1> detected during instantiation of class "Eigen::RefBase<Derived> [with Derived=Eigen::Ref<PlainObjectType, Options, StrideType>]"
1> (183): here
1>
1>c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Core/products/Parallelizer.h(20): warning : variable "m_maxThreads" was set but never used
1>
1>c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Geometry/RotationBase.h(76): error : function template "Eigen::operator*(const Eigen::EigenBase<OtherDerived> &, const Eigen::Quaternion<_Scalar, _Options> &)" has already been defined
1> detected during:
1> instantiation of class "Eigen::RotationBase<Derived, _Dim> [with Derived=Eigen::Quaternion<_Scalar, _Options>, _Dim=3]"
1> c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Geometry/Quaternion.h(35): here
1> instantiation of class "Eigen::QuaternionBase<Derived> [with Derived=Eigen::Quaternion<_Scalar, _Options>]"
1> c:\users\satanikas\documents\visual studio 2012\common\inc\eigen\src/Geometry/Quaternion.h(236): here
1>
1> 3 errors detected in the compilation of "C:/Users/SATANI~1/AppData/Local/Temp/tmpxft_000010c8_00000000-5_kernel.cpp1.ii".
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V110\BuildCustomizations\CUDA 5.5.targets(592,9): error MSB3721: The command ""C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\bin\nvcc.exe" -gencode=arch=compute_10,code=\"sm_10,compute_10\" --use-local-env --cl-version 2012 -ccbin "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\x86_amd64" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\include" -G --keep-dir x64\Debug -maxrregcount=0 --machine 64 --compile -cudart static -g -DWIN64 -D_DEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /Od /Zi /RTC1 /MDd " -o x64\Debug\kernel.cu.obj "C:\Users\Satanikas\Documents\Visual Studio 2012\Projects\TX52-3DStereo-RT-CUDA\TX52-3DStereo-RT-CUDA\kernel.cu"" exited with code 2.
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:03.40
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
The errors come from 3 classes, here are their headers:
#pragma once
#include <Eigen\Geometry>
class TransformedObject
{
public:
TransformedObject(void);
~TransformedObject(void);
void rotate(const Eigen::Quaternionf&);
void setRotation(const Eigen::Quaternionf&);
void translate(const Eigen::Vector3f&);
void setTranslation(const Eigen::Vector3f&);
void scale(const float&);
const Eigen::Matrix4f getMatrix(void);
Eigen::Transform<float, 3, Eigen::Affine> transform;
};
#pragma once
#include "TransformedObject.h"
class Camera
{
public:
Camera(void);
~Camera(void);
void computeRays();
void setFOV(float angle);
void setResolution(int w, int h);
private:
TransformedObject transformation;
float fov;
unsigned int width;
unsigned int height;
float* raysDirections;
Eigen::Vector3f raysOrigin;
};
#pragma once
#include <forward_list>
#include "TransformedObject.h"
class ScenegraphNode
{
public:
ScenegraphNode(void);
~ScenegraphNode(void);
private:
TransformedObject transformation;
size_t sceneHash;
std::forward_list<ScenegraphNode*> children;
int countVertices() const;
};
As you can see, there are "pragma once" on all classes, and Eigen classes are all guarded by ifndef/define/endif.
What I gathered was that it was possibly due to my code being compiled by different TU, which included Eigen separately, hence all the "already defined" errors. But I have no idea how to correct this (I can't use extern since I use my class TransformedObject as a member of other classes).
Thanks in advance,