Simple OpenCL under QT Creator

peter_cz

Dears,

I am using QTCreator w CMake to get compiled and run OpenCL example where I am getting errors to build.

Simple example minimal-opencl-on-windows can be built with MinGW/Windows

>gcc --version
gcc (x86_64-posix-seh-rev2, Built by MinGW-W64 project) 7.1.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

such as

>gcc -Ic:\opencl\include\ main.c -Lc:\opencl\bin\x86_64\ -lOpenCL -o main.exe

or

gcc -Ic:\opencl\include\ main.c c:\opencl\bin\x86_64\OpenCL.dll -o main.exe

under QTCreator/CMake I have CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(opencl_test)
add_executable(${PROJECT_NAME} "main.c")
set (CMAKE_CXX_FLAGS "-lOpenCL")
INCLUDE_DIRECTORIES("c:\\opencl\\include\\")
LINK_DIRECTORIES("c:\\opencl\\bin\\x86_64\\")
target_link_libraries(opencl_test OpenCL.dll)

unfortunatelly I am getting error

:-1: error: cannot find -lOpenCL
collect2.exe:-1: error: error: ld returned 1 exit status

I am looking for resolution of this to get it compiled, can you help please?

Thank you.

SGaist

Hi,

Where's OpenCL.lib on your system ?

aha_1980

@peter_cz said in Simple OpenCL under QT Creator:

:-1: error: cannot find -lOpenCL
collect2.exe:-1: error: error: ld returned 1 exit status

Can you please also show the compile output before? Especially the effective linker call.

As shot in the dark, I'd try to remove the trailing backslash from LINK_DIRECTORIES:

LINK_DIRECTORIES("c:\\opencl\\bin\\x86_64")

because I already had problems with qmake in such a case.

jsulm

@peter_cz Adding libraries is actually done like this:

LIBS += -Lc:/opencl/bin/x86_64 -lOpenCL

See http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html
Also, no need to use \\, just use / (even on Windows).

aha_1980

@jsulm said in Simple OpenCL under QT Creator:

LIBS += -Lc:/opencl/bin/x86_64 -lOpenCL

See http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html
Also, no need to use \, just use / (even on Windows).

Did you read that he uses CMake, not qmake?

jsulm

@aha_1980 You're right

mchinand

Check out this link for using OpenCL with CMake.