Solved adding CUDA to Qt

[m00lecule]

Hi, im developing a qt application which would benefit form GPU acceleration, therefore i picked CUDA. However im struggling with connecting Qt and CUDA. I get this error while i build my project:

and due to the only one answer i have found it might be PATH variable issue: http://www.cs.virginia.edu/~mwb7w/cuda_support/libcudart.html , but i had already set them to proper paths

My laptop is running on Ubuntu 18.04 with NVDIA Drivier 396.45. Cuda toolkit-9.2 was installed from runfile downloaded direct from nvidia website.

Part of .pro file:

And ss of nvcc and gcc:

If somebody has a clue how to solve it or how can i move on ( i even consider switching to other SDK ) please let me know.

[aha_1980]

Hi @m00lecule,

I have the following tip for you: remove the QMAKE_LIBDIR line in the project file and change the LIBS line to the following:

LIBS += -L$$CUDA_DIR/lib64 -lcuda -lcudart

That way QtCreator will adjust the LD_LIBRARY_PATH correctly.

If that is not enough, go to a terminal, cd to $$CUDA_DIR/lib64 and post the output of ldd cuda.so and ldd cudart.so

Regards

PS: if possible, post text files as text here, that makes it way easier for me to copy and modify the values without introducing new errors. Thanks.

[SGaist]

Hi,

To add to @aha_1980 , did you check the Run part of the Project panel ? Just to see whether your LD_LIBRARY_PATH variable is set correctly.

[m00lecule]

It turned out that making cuda.conf file in /etc/ld.so.conf.d containing path to cuda libs directory and running ldconfig solved my problem.