Cuda error undefined reference to 'cufftPlan1d'? - c++

Question

I'm trying to check how to work with CUFFT and my code is the following
#include <iostream>
//For FFT
#include <cufft.h>
using namespace std;
typedef enum signaltype {REAL, COMPLEX} signal;
//Function to fill the buffer with random real values
void randomFill(cufftComplex *h_signal, int size, int flag) {
// Real signal.
if (flag == REAL) {
for (int i = 0; i < size; i++) {
h_signal[i].x = rand() / (float) RAND_MAX;
h_signal[i].y = 0;
}
}
}
//Printing the random data in the buffer
void printData(cufftComplex *a, int size, char *msg) {
if (strcmp(msg,"")==0) printf("\n");
else printf("%s\n", msg);
for (int i = 0; i < size; i++)
printf("%f %f\n", a[i].x, a[i].y);
}
// FFT a signal that's on the _DEVICE_.
// Doing FFT
void signalFFT(cufftComplex *d_signal, int signal_size)
{
cufftHandle plan;
if (cufftPlan1d(&plan, signal_size, CUFFT_C2C, 1) != CUFFT_SUCCESS)
{
printf("Failed to plan FFT\n");
exit(0);
}
// Execute the plan.
if (cufftExecC2C(plan, d_signal, d_signal, CUFFT_FORWARD) != CUFFT_SUCCESS)
{
printf ("Failed Executing FFT\n");
exit(0);
}
}
// Doing IFFT
void signalIFFT(cufftComplex *d_signal, int signal_size)
{
cufftHandle plan;
if (cufftPlan1d(&plan, signal_size, CUFFT_C2C, 1) != CUFFT_SUCCESS)
{
printf("Failed to plan IFFT\n");
exit(0);
}
// Execute the plan
if (cufftExecC2C(plan, d_signal, d_signal, CUFFT_INVERSE) != CUFFT_SUCCESS)
{
printf ("Failed Executing IFFT\n");
exit(0);
}
}
int main(int argc, char **argv)
{
cudaDeviceSynchronize();
//Declaring two complex type variables;
cufftComplex *h_signal, *d_signal1;
//Declaring the size variable
int alloc_size;
alloc_size = 16;
//Allocating the memory for CPU version complex variable
h_signal = (cufftComplex *) malloc(sizeof(cufftComplex) * alloc_size);
//Allocating the memory for GPU version complex variable
cudaMalloc(&d_signal1, sizeof(cufftComplex) * alloc_size);
// Add random data to signal.
randomFill(h_signal, alloc_size, REAL);
printData(h_signal, alloc_size, "Random H1");
// Copying the data the data to CUDA
cudaMemcpy(d_signal1, h_signal, sizeof(cufftComplex) * alloc_size, cudaMemcpyHostToDevice);
//Applying FFT
signalFFT(d_signal1, alloc_size);
//Doing IFFT
signalIFFT(d_signal1, alloc_size);
cudaMemcpy(h_signal, d_signal1, sizeof(cufftComplex) * alloc_size, cudaMemcpyDeviceToHost);
printData(h_signal, alloc_size, "IFFT");
return 0;
}
And the MAKEFILE consists of the following:
main: main.cu Makefile nvcc -o main main.cu --ptxas-options=-v --use_fast_math
But I get compilation errors, the errors are as shown in the image:
Apparently the problem is occurring only when I call the functions cufftPlan1d and cufftExecC2C. Do I have to add anything extra in the makefile to make use of these functions? My CUDA version 5.5 and I'm doing it in Ubuntu.
Thanks

Answer 1

There are two problems here
The CUFFT library is not being linked. Change the compilation command to:
nvcc -o main main.cu --ptxas-options=-v --use_fast_math -lcufft
Set LD_LIBRARY_PATH to include the absolute path to the CUFFT library to allow runtime loading of the shared library. The syntax for this can be found here.
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