Easiest way to test for existence of cuda-capable GPU from cmake?

Question

We have some nightly build machines that have the cuda libraries installed, but which do not have a cuda-capable GPU installed. These machines are capable of building cuda-

Answer 1

You can compile small GPU query program if cuda was found. here is a simple one you can adopt the needs:

#include 
#include 
#include 
#include 

int main(int argc, char** argv) {
  int ct,dev;
  cudaError_t code;
  struct cudaDeviceProp prop;

 cudaGetDeviceCount(&ct);
 code = cudaGetLastError();
 if(code)  printf("%s\n", cudaGetErrorString(code));


if(ct == 0) {
   printf("Cuda device not found.\n");
   exit(0);
}
 printf("Found %i Cuda device(s).\n",ct);

for (dev = 0; dev < ct; ++dev) {
printf("Cuda device %i\n", dev);

cudaGetDeviceProperties(&prop,dev);
printf("\tname : %s\n", prop.name);
 printf("\ttotalGlobablMem: %lu\n", (unsigned long)prop.totalGlobalMem);
printf("\tsharedMemPerBlock: %i\n", prop.sharedMemPerBlock);
printf("\tregsPerBlock: %i\n", prop.regsPerBlock);
printf("\twarpSize: %i\n", prop.warpSize);
printf("\tmemPitch: %i\n", prop.memPitch);
printf("\tmaxThreadsPerBlock: %i\n", prop.maxThreadsPerBlock);
printf("\tmaxThreadsDim: %i, %i, %i\n", prop.maxThreadsDim[0], prop.maxThreadsDim[1], prop.maxThreadsDim[2]);
printf("\tmaxGridSize: %i, %i, %i\n", prop.maxGridSize[0], prop.maxGridSize[1], prop.maxGridSize[2]);
printf("\tclockRate: %i\n", prop.clockRate);
printf("\ttotalConstMem: %i\n", prop.totalConstMem);
printf("\tmajor: %i\n", prop.major);
printf("\tminor: %i\n", prop.minor);
printf("\ttextureAlignment: %i\n", prop.textureAlignment);
printf("\tdeviceOverlap: %i\n", prop.deviceOverlap);
printf("\tmultiProcessorCount: %i\n", prop.multiProcessorCount);
}
}