Linking issue with (Intel SDK) OpenCL and Code::Blocks - opencl

Question

I was trying to get my problem solved for hours, but I did not find any usefull hints. Hopefully you guys can help me out:
Some usefull data:
OS: Windows 8 Basic 64bit
Library: Intel OpenCL SDK
Compiler: MinGW(-gcc) (latest version)
IDE: Code::Blocks (latest version)
Minimal not working Code:
#include <stdlib.h>
#include <CL/cl.h>
int main(void)
{
cl_uint available;
cl_platform_id* platforms = (cl_platform_id*)malloc(sizeof(cl_platform_id));
cl_int result = clGetPlatformIDs(1, platforms, &available);
free(platforms);
if(result == CL_SUCCESS)
return 0;
return -1;
}
Code::Blocks Global Compiler Settings:
Linker Settings: Added path to Intel's OpenCL.lib ([...]\Intel\OpenCL SDK\3.0\lib\x64\OpenCL.lib) (tried -lOpenCL as Other Options as well)
Search-Directories for Compiler: Path to Intels OpenCL-SDK include directory ([...]\Intel\OpenCL SDK\3.0\include)
Search-Directories for Linker: Path to Intels OpenCL-Lib directory ([...]\Intel\OpenCL SDK\3.0\lib\x64)
Build-Log:
mingw32-g++.exe -L"[...]\Intel\OpenCL SDK\3.0\lib\x64" -o bin\Release\openCLTest.exe obj\Release\main.o -s "[...]\Intel\OpenCL SDK\3.0\lib\x64\OpenCL.lib"
obj\Release\main.o:main.c:(.text.startup+0x39): undefined reference to `clGetPlatformIDs#12'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
1 errors, 0 warnings (0 minutes, 0 seconds)
I do not know why he does not link properly.
The [...] in the text is modified by me to shorten the path, normally it would be "C:\Program Files (x86)...".
Hopefully you guys can help me! It is really frustrating! :(
Do you need more information?
EDIT:
Okay... one additional hour and I solved my own problem.
Hope this hint can help some other ppl:
I had to link additionally against the x86-library (seems that some functions are not implemented in X64).
Good to know -.-'''

Answer 1

I got the same problem and I tried hard to figure out the solution and finally I did :)
First of all my hardware are Intel Processor Intel(R) Core(TM) i5-2500 CPU # 3.30GHz and Intel(R) HD Graphics then I installed Intel OpenCL SDK 1.2 after updating the drivers. After that I configure the code::blocks to the new paths for include folder and lib folder as mentioned on the following link: http://www.obellianne.fr/alexandre/tutorials/OpenCL/tuto_opencl_codeblocks.php
Then I tried to compile the examples and I got linking problem as follows:
opencl.o(.text+0x6f):opencl.c: undefined reference to `clGetPlatformIDs#12'
opencl.o(.text+0xa7):opencl.c: undefined reference to `clGetDeviceIDs#24'
opencl.o(.text+0x142):opencl.c: undefined reference to `clGetDeviceInfo#20'
opencl.o(.text+0x263):opencl.c: undefined reference to `clGetDeviceInfo#20'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
4 errors, 0 warnings (0 minutes, 0 seconds)
I tried to use command line and I got the same error then I tried to uninstall Intel sdk and replace it with AMD sdk 2.8 which is support X86 CPU with SSE (Streaming SIMD Extension which is designed by Intel ) 2.x orlater
http://developer.amd.com/tools-and-sdks/heterogeneous-computing/amd-accelerated-parallel-processing-app-sdk/system-requirements-driver-compatibility/
Finally it works :)
I hope you find this comment useful.

Answer 2

According to an external source i stumbled upon along my own path of enlightenment to this problem i found out something is actually wrong with the mingw-w64 linker. mingw-w64's ld.exe does not want to link with the standard libopencl.a.. whether this is intel SDK specific or not im not sure but here is the link to the solution.
http://sourceforge.net/p/mingw-w64/support-requests/46/
you just have to link to the supplied libopencl.a instead of the default one.
still dont know exactly why the linker gives a problem but i have verified that the solution does (some how) solve the problem.