Problem linking OpenCL

[mirror3000]

I work on a project and I must link the OpenCL library on Windows.
When I use the QtCreator to add it (right click on project, in project tree/Add library), I get error “LNK2019: unresolved external symbol clGetPlatformID”
The .pro file looks like this:

@win32: LIBS += -L$$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/lib/Win32/ -lOpenCL

INCLUDEPATH += $$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/lib/Win32
DEPENDPATH += $$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/include

win32: PRE_TARGETDEPS += $$PWD/../../../../../Program Files/NVIDIA GPU Computing --Toolkit/CUDA/v5.0/lib/Win32/OpenCL.lib@

Also, I tried a different approach: I copied the OpenCL folder to C:\opencl because I thought that the white spaces in the file path may cause problems, but I still get the same errors.
The .pro file for this approach looks like this:

@win32:CONFIG(release, debug|release): LIBS += -Lc:/opencl/lib/Win32 -lOpenCL
else:win32:CONFIG(debug, debug|release): LIBS += -Lc:/opencl/lib/Win32 -lOpenCL

INCLUDEPATH += c:/opencl/include
DEPENDPATH += c:/opencl/include@

Another problem I get is when I try to include <CL/cl.h>.
@C1083: Cannot open include file: 'CL/cl.h': No such file or directory.@

I fixed this by copying the cl.h in the project, but this isn’t the best way.
Any ideas of how to fix this?

[koahnig]

welcome to devnet

This looks like a compiler mismatch.
Are you sure that the openCL lib is compiled with the same compiler and the same version as you are using in Qt creator as a tool chain?

[quote author="mirror3000" date="1374788633"]
@win32:CONFIG(release, debug|release): LIBS += -Lc:/opencl/lib/Win32 -lOpenCL
else:win32:CONFIG(debug, debug|release): LIBS += -Lc:/opencl/lib/Win32 -lOpenCL

INCLUDEPATH += c:/opencl/include
DEPENDPATH += c:/opencl/include@
[/quote]
You are using the same LIBS statement for debug and release. If that is your intention, you can change to :
@LIBS += -Lc:/opencl/lib/Win32 -lOpenCL
@

However, this may be also the basis of your problem. You may try to use a release lib with a debug compilation. You need to check.

[quote author="mirror3000" date="1374788633"]
Another problem I get is when I try to include <CL/cl.h>.
@C1083: Cannot open include file: 'CL/cl.h': No such file or directory.@
[/quote]

Where is the include file located?
Your current project.pro allows only includes from
@
INCLUDEPATH += c:/opencl/include
@

You need to add the location where the actual include is located.

Based on this information
[quote author="mirror3000" date="1374788633"]
@win32: LIBS += -L$$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/lib/Win32/ -lOpenCL

INCLUDEPATH += $$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/lib/Win32
DEPENDPATH += $$PWD/../../../../../Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/include

win32: PRE_TARGETDEPS += $$PWD/../../../../../Program Files/NVIDIA GPU Computing --Toolkit/CUDA/v5.0/lib/Win32/OpenCL.lib@
[/quote]

I guess it should be something like
@
INCLUDEPATH += c:/opencl/include
INCLUDEPATH += c:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v5.0/lib/include
@

[SGaist]

Hi,

to add to what koahnig wrote, IIRC when installing cuda sets up some environment variables containing the path to its installation folder, you can use them in your pro file

[mirror3000]

@SGaist Yes, they do add environment variables. Thanks for the tip:)

The compiler I use with QtCreator is MSVC 11 x64.
I tried including both the X64 and Win32 libraries, but it didn't work with debug compilation. It works with release compilation.

[SGaist]

What doesn't work in debug mode ?