"/usr/bin/ld: cannot find -lcudart"
I am newbie to Ubuntu and using Ubuntu 14.04 64-bit. I want to make
a project that uses cuda
and opencv
I got the following error when running cmake . && make
Linking CXX executable ground_estimation
/usr/bin/ld: cannot find -lcudart
collect2: error: ld returned 1 exit status
make[2]: *** [ground_estimation] Error 1
make[1]: *** [CMakeFiles/ground_estimation.dir/all] Error 2
make: *** [all] Error 2
This is the output of ld -lcudart --verbose
attempt to open /usr/x86_64-linux-gnu/lib64/libcudart.so failed
attempt to open /usr/x86_64-linux-gnu/lib64/libcudart.a failed
attempt to open //usr/local/lib/x86_64-linux-gnu/libcudart.so failed
attempt to open //usr/local/lib/x86_64-linux-gnu/libcudart.a failed
attempt to open //usr/local/lib64/libcudart.so failed
attempt to open //usr/local/lib64/libcudart.a failed
attempt to open //lib/x86_64-linux-gnu/libcudart.so failed
attempt to open //lib/x86_64-linux-gnu/libcudart.a failed
attempt to open //lib64/libcudart.so failed
attempt to open //lib64/libcudart.a failed
attempt to open //usr/lib/x86_64-linux-gnu/libcudart.so failed
attempt to open //usr/lib/x86_64-linux-gnu/libcudart.a failed
attempt to open //usr/lib64/libcudart.so failed
attempt to open //usr/lib64/libcudart.a failed
attempt to open //usr/local/lib/libcudart.so failed
attempt to open //usr/local/lib/libcudart.a failed
attempt to open //lib/libcudart.so failed
attempt to open //lib/libcudart.a failed
attempt to open //usr/lib/libcudart.so failed
attempt to open //usr/lib/libcudart.a failed
libcudart
exist in /usr/local/cuda/lib64
and I also added to Library Path:
echo $LD_LIBRARY_PATH
/usr/lib/nvidia-current:/usr/local/cuda/lib64:/usr/local/cuda/lib:
This is the output of ls /usr/local/cuda/lib64
:
libcublas_device.a libcufftw.so.6.0.37 libnppi.so.6.0
libcublas.so libcuinj64.so libnppi.so.6.0.37
libcublas.so.6.0 libcuinj64.so.6.0 libnpps.so
libcublas.so.6.0.37 libcuinj64.so.6.0.37 libnpps.so.6.0
libcudadevrt.a libcurand.so libnpps.so.6.0.37
libcudart.so libcurand.so.6.0 libnvblas.so
libcudart.so.6.0 libcurand.so.6.0.37 libnvblas.so.6.0
libcudart.so.6.0.37 libcusparse.so libnvblas.so.6.0.37
libcudart_static.a libcusparse.so.6.0 libnvToolsExt.so
libcufft.so libcusparse.so.6.0.37 libnvToolsExt.so.1
libcufft.so.6.0 libnppc.so libnvToolsExt.so.1.0.0
libcufft.so.6.0.37 libnppc.so.6.0 libOpenCL.so
libcufftw.so libnppc.so.6.0.37 libOpenCL.so.1
libcufftw.so.6.0 libnppi.so
What should I do that ld
search in /usr/local/cuda/lib64
path to find libcudart
?
Make a symbolic link to libcuda
where ld
is searching it.
sudo ln -s /usr/local/cuda/lib64/libcudart.so /usr/lib/libcudart.so
LD_LIBRARY_PATH
is used to modify the behaviour of the ldconfig
and related tools when looking for the libraries, at execution time.
The ld
linker tool doesn't use this variable. If you want to use a library located in a non-standard directory, you have to use the -L
parameter of the command, like this :
ld -lcuda -L/usr/local/cuda/lib64
If you have downloaded and existing project and doesn't know how to modify the existing Makefile(s) without breaking the whole compilation, you can run make the following way :
export LDFLAGS=-L/usr/local/cuda/lib64
make
The variable LDFLAGS (which may be also defined into the Makefile), is used to pass specific arguments to the linker (ld
) when launched by the compilation intructions.