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My programming experience is about 1 year of C/C++ experience from high school, but I did my research and wrote a simple program with OpenCL a few months ago. I was able to compile and run this on an Apple computer relatively easily with g++ and the --framework option. Now I'm on my Ubuntu machine and I have no idea how to compile it. The correct drivers have been downloaded along with ATI's Stream SDK (I have an ATI Radeon HD5870). Any help would be appreciated!

Ciro Santilli新疆棉花TRUMP BAN BAD
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user492268
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3 Answers3

8

Try

locate libOpenCL.so

If it is in one of the standard directories (most likely /usr/lib, or /usr/local/lib) you need to replace "--framework OpenCL" with "-lOpenCL". If g++ cannot find the lib you can tell g++ to look in a specific directory by adding "-L/path/to/library".

I wish I had my Linux to be more helpful... It is probably best if you redownload the ati-stream-sdk, after extracting it, open the Terminal and "cd /path/to/extracted/files"; in that directory execute make && sudo make install

  • make you probably know this from windows, this compiles, whatever needs to be compiled
  • && chains commands together, the following commands will only be executed if the first command succeeded
  • sudo make install this will put the files in the expected places (sudo executes a command with superuser priviledges, you will have to enter your password)

Hope that helps.

bjoernz
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  • I've tried this, but then I get the error "fatal error: CL/opencl.h: No such file or directory" (one of the things that I #included in my program). – user492268 Oct 30 '10 at 20:56
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    maybe you need to tell g++ about the location of the "CL/" directory (you do this with a "dash capital i"): g++ -L/path/to/library -I/path/to/CL main.cpp -lOpenCL – bjoernz Oct 30 '10 at 21:00
  • Now I'm getting: /usr/bin/ld: cannot find -lOpenCL collect2: ld returned 1 exit status. Maybe I should be asking whether I am supposed to have moved around files from the SDK folder into different parts of my filesystem. I apologize, I am new to Linux (just recently trying to switch from Windows). – user492268 Oct 30 '10 at 21:07
  • And she compiles and runs! Unfortunately, I wrote this when OpenCL was still in the beta...so apparently some code changes are needed. Thanks for the help! – user492268 Oct 30 '10 at 22:29
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    Oh, and in case anyone is in a similar position, the final line to compile was: "g++ -lOpenCL -L/stream-sdk-2.2/lib/x86_64/ -I/stream-sdk-2.2/include/ [file_name].c" – user492268 Oct 30 '10 at 22:30
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    I had to run `g++ -L/opt/AMDAPP/lib/x86_64/ -I/opt/AMDAPP/include [filename.cpp] -lOpenCL` – Benjamin Manns Sep 14 '12 at 14:11
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You might be missing the dynamic libraries from the dynamic linker configuration.

Search for where the libraries are. Most likely /usr/lib, or /usr/local/lib.

Make sure the path location is also configured at one of these places:

  • LD_LIBRARY_PATH - you can set it in you environment shell, like .bashrc
  • /etc/ld.so.conf - you will need to call ldconfig to update the cache and it requires root access to change the file.
Paulo Pinto
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Reason

Aside from @bjoernz, my system can't find the libOpenCL.so file

It's because the correct file directory is missing

After searchig over the internet, I found out that libOpenCL.so file can provided by ocl-icd-opencl-dev package

Solution

You just need to install the package mentioned above by typing into cmd

sudo apt update
sudo apt install ocl-icd-opencl-dev

Therefore, libOpenCL.so can be found under /usr/lib/x86_64-linux-gnu/ folder

My System Information

  • OS: Ubuntu 16.04 LTS
  • GPU: NVIDIA GeForce GTX 660
  • GPU Driver: nvidia-375
  • OpenCL: 1.2

Reference:

[1] How to install libOpenCL.so on ubuntu

[2] How to set up OpenCL in Linux

WY Hsu
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