Error in compilation : undefined reference to 'clGetPlatformInfo#20' - windows

Question

I'm such a newby concerning OpenCL programming, and I want to run a simple program which is in "OpenCL Parallel Programming Development Cookbook".
In fact, I want to query OpenCl platforms by this simple prog:
#include <stdio.h>
#include <stdlib.h>
#include <CL/cl.h>
void displayPlatformInfo(cl_platform_id id,
cl_platform_info param_name,
const char* paramNameAsStr) {
cl_int error = 0;
size_t paramSize = 0;
error = clGetPlatformInfo( id, param_name, 0, NULL, &paramSize );
char* moreInfo = (char*)malloc( sizeof(char) * paramSize);
error = clGetPlatformInfo( id, param_name, paramSize,moreInfo, NULL );
if (error != CL_SUCCESS ) {
perror("Unable to find any OpenCL platform information");
return;
}
printf("%s: %s\n", paramNameAsStr, moreInfo);
}
int main() {
/* OpenCL 1.2 data structures */
cl_platform_id* platforms;
/* OpenCL 1.1 scalar data types */
cl_uint numOfPlatforms;
cl_int error;
/*
Get the number of platforms
Remember that for each vendor's SDK installed on the
Computer, the number of available platform also
*/
error = clGetPlatformIDs(0, NULL, &numOfPlatforms);
if(error < 0) {
perror("Unable to find any OpenCL platforms");
exit(1);
}
// Allocate memory for the number of installed platforms.
// alloca(...) occupies some stack space but is
// automatically freed on return
platforms = (cl_platform_id*) malloc(sizeof(cl_platform_id)
* numOfPlatforms);
printf("Number of OpenCL platforms found: %d\n",
numOfPlatforms);
// We invoke the API 'clPlatformInfo' twice for each
// parameter we're trying to extract
// and we use the return value to create temporary data
// structures (on the stack) to store
// the returned information on the second invocation.
for(cl_uint i = 0; i < numOfPlatforms; ++i) {
displayPlatformInfo( platforms[i],
CL_PLATFORM_PROFILE,
"CL_PLATFORM_PROFILE" );
displayPlatformInfo( platforms[i],
CL_PLATFORM_VERSION,
"CL_PLATFORM_VERSION" );
displayPlatformInfo( platforms[i],
CL_PLATFORM_NAME,
"CL_PLATFORM_NAME" );
displayPlatformInfo( platforms[i],
CL_PLATFORM_VENDOR,
"CL_PLATFORM_VENDOR" );
displayPlatformInfo( platforms[i],
CL_PLATFORM_EXTENSIONS,
"CL_PLATFORM_EXTENSIONS" );
}
return 0;
}
I'm on Qt Creator, and my pc's config concerning video is : NVIDIA GEFORCE GT 635M & Intel(R) HD Graphics 4000 under Windows 8.1
My .pro file is :
SOURCES += \
main.cpp
QMAKE_CXXFLAGS += -std=c++0x
INCLUDEPATH += \
$$quote(C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v6.5/include)
LIBS += \
$$quote(C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v6.5/lib/x64/OpenCL.lib)
Because of spaces in file path. So, my question is : Why, when i'm compiling my project, does the problem "undefined reference to clGetPlatformInfo#20'" appear? There's 2 others errors (one which exactly the same, the other is "undefined reference toclGetPlatformIDs#12'")
I search on the web for a lot of days and I can't find the answer (these prob has answer but on Linux or on Mac..)
Thanks in advance !
Mathieu

Answer 1

It looks like you are trying to build 32-bit application, while linking with 64-bit version of OpenCL.lib:
C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v6.5/lib/x64/OpenCL.lib
So, either build application in 64-bit mode, or fix the path to point to 32-bit version of OpenCL.lib.