title: Compiling CUDA Mex Files using Visual Studio 2013 IDE
body: <p>I am trying to compile following program, which is a CUDA mex file for MATLAB, using Visual Studio 2013.<br>
  There are <a href="http://www.mathworks.com/help/matlab/matlab_external/compiling-mex-files-with-the-microsoft-visual-c-ide.html" rel="nofollow">instructions</a> available on MATLAB's official website only for C++ Mex files , not for the CUDA mex.<br>
  So I made following additional changes to my project settings while following the official instructions on Mathworks:<br>
  1. I created a project using Visual studio project with my installed CUDA 6.5 runtime.<br>
  2. Included the libs (libmx.lib,libmex.lib,libmat.lib,gpu.lib) in Linker properties of my VS project,<br>
  3. Added a directory include, (MATLABROOT)\toolbox\distcomp\gpu\extern\include;</p>
  
  <p>Still I get many unresolved external symbol error. What is the right way to do this, since there is no official documentation available for compiling CUDA Mex using VS IDE ? Does anyone has any idea what is the proper way to do this ? Surely I am missing some setting, can someone help please ?</p>
  
  <p>My Program (copied from MATLAB example file, mexGPUExample.cu ) is as follow:</p>
  
  <pre><code>   **
  /*
  * Example of how to use the mxGPUArray API in a MEX file.  This example shows
  * how to write a MEX function that takes a gpuArray input and returns a
  * gpuArray output, e.g. B=mexFunction(A).
  *
  * Copyright 2012 The MathWorks, Inc.
  */
  #include "cuda_runtime.h"
  #include "device_launch_parameters.h"
  #include "mex.h"
  #include "gpu/mxGPUArray.h"
  
  /*
  * Device code
  */
  void __global__ TimesTwo(double const * const A,
      double * const B,
      int const N)
  {
      /* Calculate the global linear index, assuming a 1-d grid. */
      int const i = blockDim.x * blockIdx.x + threadIdx.x;
      if (i &lt; N) {
          B[i] = 2.0 * A[i];
      }
  }
  
  /*
  * Host code
  */
  
  void mexFunction(int nlhs, mxArray *plhs[],
      int nrhs, mxArray const *prhs[])
  {
      /* Declare all variables.*/
      mxGPUArray const *A;
      mxGPUArray *B;
      double const *d_A;
      double *d_B;
      int N;
      char const * const errId = "parallel:gpu:mexGPUExample:InvalidInput";
      char const * const errMsg = "Invalid input to MEX file.";
  
      /* Choose a reasonably sized number of threads for the block. */
      int const threadsPerBlock = 256;
      int blocksPerGrid;
  
      /* Initialize the MathWorks GPU API. */
      mxInitGPU();
  
      /* Throw an error if the input is not a GPU array. */
      if ((nrhs != 1) || !(mxIsGPUArray(prhs[0]))) {
          mexErrMsgIdAndTxt(errId, errMsg);
      }
  
      A = mxGPUCreateFromMxArray(prhs[0]);
  
      /*
      * Verify that A really is a double array before extracting the pointer.
      */
      if (mxGPUGetClassID(A) != mxDOUBLE_CLASS) {
          mexErrMsgIdAndTxt(errId, errMsg);
      }
  
      /*
      * Now that we have verified the data type, extract a pointer to the input
      * data on the device.
      */
      d_A = (double const *)(mxGPUGetDataReadOnly(A));
  
      /* Create a GPUArray to hold the result and get its underlying pointer. */
      B = mxGPUCreateGPUArray(mxGPUGetNumberOfDimensions(A),
          mxGPUGetDimensions(A),
          mxGPUGetClassID(A),
          mxGPUGetComplexity(A),
          MX_GPU_DO_NOT_INITIALIZE);
      d_B = (double *)(mxGPUGetData(B));
  
      /*
      * Call the kernel using the CUDA runtime API. We are using a 1-d grid here,
      * and it would be possible for the number of elements to be too large for
      * the grid. For this example we are not guarding against this possibility.
      */
      N = (int)(mxGPUGetNumberOfElements(A));
      blocksPerGrid = (N + threadsPerBlock - 1) / threadsPerBlock;
      TimesTwo &lt;&lt;&lt; blocksPerGrid, threadsPerBlock &gt;&gt;&gt;(d_A, d_B, N);
  
      /* Wrap the result up as a MATLAB gpuArray for return. */
      plhs[0] = mxGPUCreateMxArrayOnGPU(B);
  
      /*
      * The mxGPUArray pointers are host-side structures that refer to device
      * data. These must be destroyed before leaving the MEX function.
      */
      mxGPUDestroyGPUArray(A);
      mxGPUDestroyGPUArray(B);
  }
  </code></pre>
  
  <p>Errors I get when I try to compile my program :  </p>
  
  <pre><code>Error   66  error LNK1120: 64 unresolved externals  
  Error   64  error LNK2001: unresolved external symbol _fltused  
  Error   62  error LNK2001: unresolved external symbol _RTC_InitBase 
  Error   63  error LNK2001: unresolved external symbol _RTC_Shutdown 
  Error   65  error LNK2001: unresolved external symbol mainCRTStartup    
  Error   58  error LNK2019: unresolved external symbol __imp__dsign referenced in function "bool __cdecl signbit(double)" (?signbit@@YA_NN@Z)    
  Error   60  error LNK2019: unresolved external symbol __imp__fdsign referenced in function "bool __cdecl signbit(float)" (?signbit@@YA_NM@Z)    
  Error   61  error LNK2019: unresolved external symbol __imp__hypotf referenced in function hypotf   
  Error   59  error LNK2019: unresolved external symbol __imp__ldsign referenced in function "bool __cdecl signbit(long double)" (?signbit@@YA_NO@Z)  
  Error   39  error LNK2019: unresolved external symbol __imp_acosf referenced in function "float __cdecl acos(float)" (?acos@@YAMM@Z)    
  Error   12  error LNK2019: unresolved external symbol __imp_acoshf referenced in function "float __cdecl acosh(float)" (?acosh@@YAMM@Z) 
  Error   40  error LNK2019: unresolved external symbol __imp_asinf referenced in function "float __cdecl asin(float)" (?asin@@YAMM@Z)    
  Error   13  error LNK2019: unresolved external symbol __imp_asinhf referenced in function "float __cdecl asinh(float)" (?asinh@@YAMM@Z) 
  Error   42  error LNK2019: unresolved external symbol __imp_atan2f referenced in function "float __cdecl atan2(float,float)" (?atan2@@YAMMM@Z)  
  Error   41  error LNK2019: unresolved external symbol __imp_atanf referenced in function "float __cdecl atan(float)" (?atan@@YAMM@Z)    
  Error   14  error LNK2019: unresolved external symbol __imp_atanhf referenced in function "float __cdecl atanh(float)" (?atanh@@YAMM@Z) D:\GitHub\arrayfire-windows-scripts\SimpleCUDAProj\CUDA_Mex\CUDA_Mex\CUDA_Times_Two.cu.obj  CUDA_Mex
  Error   29  error LNK2019: unresolved external symbol __imp_cbrtf referenced in function "float __cdecl cbrt(float)" (?cbrt@@YAMM@Z)    
  Error   55  error LNK2019: unresolved external symbol __imp_ceilf referenced in function "float __cdecl ceil(float)" (?ceil@@YAMM@Z)    
  Error   36  error LNK2019: unresolved external symbol __imp_copysignf referenced in function "float __cdecl copysign(float,float)" (?copysign@@YAMMM@Z) 
  Error   43  error LNK2019: unresolved external symbol __imp_cosf referenced in function "float __cdecl cos(float)" (?cos@@YAMM@Z)   
  Error   46  error LNK2019: unresolved external symbol __imp_coshf referenced in function "float __cdecl cosh(float)" (?cosh@@YAMM@Z)    
  Error   33  error LNK2019: unresolved external symbol __imp_erfcf referenced in function "float __cdecl erfc(float)" (?erfc@@YAMM@Z)    
  Error   32  error LNK2019: unresolved external symbol __imp_erff referenced in function "float __cdecl erf(float)" (?erf@@YAMM@Z)   
  Error   8   error LNK2019: unresolved external symbol __imp_exp2f referenced in function "float __cdecl exp2(float)" (?exp2@@YAMM@Z)    
  Error   49  error LNK2019: unresolved external symbol __imp_expf referenced in function "float __cdecl exp(float)" (?exp@@YAMM@Z)   
  Error   9   error LNK2019: unresolved external symbol __imp_expm1f referenced in function "float __cdecl expm1(float)" (?expm1@@YAMM@Z) 
  Error   28  error LNK2019: unresolved external symbol __imp_fdimf referenced in function "float __cdecl fdim(float,float)" (?fdim@@YAMMM@Z) 
  Error   56  error LNK2019: unresolved external symbol __imp_floorf referenced in function "float __cdecl floor(float)" (?floor@@YAMM@Z) 
  Error   38  error LNK2019: unresolved external symbol __imp_fmaf referenced in function "float __cdecl fma(float,float,float)" (?fma@@YAMMMM@Z) 
  Error   7   error LNK2019: unresolved external symbol __imp_fmaxf referenced in function "float __cdecl fmax(float,float)" (?fmax@@YAMMM@Z) 
  Error   6   error LNK2019: unresolved external symbol __imp_fminf referenced in function "float __cdecl fmin(float,float)" (?fmin@@YAMMM@Z) 
  Error   57  error LNK2019: unresolved external symbol __imp_fmodf referenced in function "float __cdecl fmod(float,float)" (?fmod@@YAMMM@Z) 
  Error   19  error LNK2019: unresolved external symbol __imp_frexp referenced in function frexpf 
  Error   17  error LNK2019: unresolved external symbol __imp_ilogbf referenced in function "int __cdecl ilogb(float)" (?ilogb@@YAHM@Z)   
  Error   15  error LNK2019: unresolved external symbol __imp_ldexp referenced in function ldexpf 
  Error   34  error LNK2019: unresolved external symbol __imp_lgammaf referenced in function "float __cdecl lgamma(float)" (?lgamma@@YAMM@Z)  
  Error   25  error LNK2019: unresolved external symbol __imp_llrintf referenced in function "__int64 __cdecl llrint(float)" (?llrint@@YA_JM@Z)   
  Error   22  error LNK2019: unresolved external symbol __imp_llroundf referenced in function "__int64 __cdecl llround(float)" (?llround@@YA_JM@Z)    
  Error   51  error LNK2019: unresolved external symbol __imp_log10f referenced in function "float __cdecl log10(float)" (?log10@@YAMM@Z) 
  Error   11  error LNK2019: unresolved external symbol __imp_log1pf referenced in function "float __cdecl log1p(float)" (?log1p@@YAMM@Z) 
  Error   10  error LNK2019: unresolved external symbol __imp_log2f referenced in function "float __cdecl log2(float)" (?log2@@YAMM@Z)    
  Error   16  error LNK2019: unresolved external symbol __imp_logbf referenced in function "float __cdecl logb(float)" (?logb@@YAMM@Z)    
  Error   50  error LNK2019: unresolved external symbol __imp_logf referenced in function "float __cdecl log(float)" (?log@@YAMM@Z)   
  Error   24  error LNK2019: unresolved external symbol __imp_lrintf referenced in function "long __cdecl lrint(float)" (?lrint@@YAJM@Z)  
  Error   21  error LNK2019: unresolved external symbol __imp_lroundf referenced in function "long __cdecl lround(float)" (?lround@@YAJM@Z)   
  Error   52  error LNK2019: unresolved external symbol __imp_modff referenced in function "float __cdecl modf(float,float *)" (?modf@@YAMMPEAM@Z)    
  Error   26  error LNK2019: unresolved external symbol __imp_nearbyintf referenced in function "float __cdecl nearbyint(float)" (?nearbyint@@YAMM@Z) 
  Error   37  error LNK2019: unresolved external symbol __imp_nextafterf referenced in function "float __cdecl nextafter(float,float)" (?nextafter@@YAMMM@Z)  
  Error   53  error LNK2019: unresolved external symbol __imp_powf referenced in function "float __cdecl pow(float,float)" (?pow@@YAMMM@Z)    
  Error   30  error LNK2019: unresolved external symbol __imp_remainderf referenced in function "float __cdecl remainder(float,float)" (?remainder@@YAMMM@Z)  
  Error   31  error LNK2019: unresolved external symbol __imp_remquof referenced in function "float __cdecl remquo(float,float,int *)" (?remquo@@YAMMMPEAH@Z) 
  Error   23  error LNK2019: unresolved external symbol __imp_rintf referenced in function "float __cdecl rint(float)" (?rint@@YAMM@Z)    
  Error   20  error LNK2019: unresolved external symbol __imp_roundf referenced in function "float __cdecl round(float)" (?round@@YAMM@Z) 
  Error   18  error LNK2019: unresolved external symbol __imp_scalblnf referenced in function "float __cdecl scalbln(float,long)" (?scalbln@@YAMMJ@Z) 
  Error   44  error LNK2019: unresolved external symbol __imp_sinf referenced in function "float __cdecl sin(float)" (?sin@@YAMM@Z)   
  Error   47  error LNK2019: unresolved external symbol __imp_sinhf referenced in function "float __cdecl sinh(float)" (?sinh@@YAMM@Z)    
  Error   54  error LNK2019: unresolved external symbol __imp_sqrtf referenced in function "float __cdecl sqrt(float)" (?sqrt@@YAMM@Z)    
  Error   45  error LNK2019: unresolved external symbol __imp_tanf referenced in function "float __cdecl tan(float)" (?tan@@YAMM@Z)   
  Error   48  error LNK2019: unresolved external symbol __imp_tanhf referenced in function "float __cdecl tanh(float)" (?tanh@@YAMM@Z)    
  Error   35  error LNK2019: unresolved external symbol __imp_tgammaf referenced in function "float __cdecl tgamma(float)" (?tgamma@@YAMM@Z)
  Error   27  error LNK2019: unresolved external symbol __imp_truncf referenced in function "float __cdecl trunc(float)" (?trunc@@YAMM@Z) 
  Error   2   error LNK2019: unresolved external symbol atexit referenced in function "void __cdecl __nv_cudaEntityRegisterCallback(void * *)" (?__nv_cudaEntityRegisterCallback@@YAXPEAPEAX@Z)   
  Error   5   error LNK2019: unresolved external symbol fabs referenced in function "double __cdecl abs(double)" (?abs@@YANN@Z)   
  Error   3   error LNK2019: unresolved external symbol labs referenced in function "long __cdecl abs(long)" (?abs@@YAJJ@Z)   
  Error   4   error LNK2019: unresolved external symbol llabs referenced in function "__int64 __cdecl abs(__int64)" (?abs@@YA_J_J@Z)
  </code></pre>