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Thread: OpenCL in Android NDK r9

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  1. #1
    Newbie
    Join Date
    Oct 2013
    Posts
    4

    Unhappy OpenCL in Android NDK r9

    Hi all,

    I cannot use OpenCL......I can compile my code with linking errors......

    I have copied libOpenCL.so from my mobile (Android) to my PC folders:

    C:\android-ndk\platforms\android-X\arch-arm\usr\lib, X = 18, 14, 9, 8, 5, 4, and 3

    In Android.mk

    If I use LOCAL_LDLIBS += -lOpenCL, it will say

    non-system libraries in linker flags: -lOpenCL
    Android NDK: This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES
    Android NDK: or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the
    Android NDK: current module


    And, it will CRASH in the run time!!!

    If I link it by LOCAL_SHARED_LIBRARIES += libOpenCL, it will cause errors like "undefined reference to `clGetPlatformIDs'."

    Does anyone can help me???? How to use OpenCL? Your help would be greatly appreciated.

  2. #2
    I don't know exactly the issue you are running into, but I have some questions that might lead us there:

    - Do you know that OpenCL is officially supported on your device? Do you expect this to work, or are you just trying to see if it works?
    - When you run "objdump -x libOpenCL.so" on the library you copied from the device, do you see OpenCL entry points like clGetPlatformIDs?
    - What happens when you load libOpenCL.so dynamically in your Java code before your own native library using System.loadLibrary?

  3. #3
    Newbie
    Join Date
    Oct 2013
    Posts
    4
    - Do you know that OpenCL is officially supported on your device? Do you expect this to work, or are you just trying to see if it works?

    I expect it should work.

    - When you run "objdump -x libOpenCL.so" on the library you copied from the device, do you see OpenCL entry points like clGetPlatformIDs?

    I cannot check it now (I format all the device), but I think the answer is NO.

    - What happens when you load libOpenCL.so dynamically in your Java code before your own native library using System.loadLibrary?

    No, I did not use this way. I call it by my ".so" file.

    Thank you for your reply, I just think my driver should have problem. But I don't know how to update OpenCL driver of my Android device...
    Last edited by www1800; 10-23-2013 at 05:51 AM.

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