Compiling OpenCL programs on Mac OS X Snow Leopard

I installed Snow Leopard on my laptop yesterday. I was very curious about OpenCL and installed the drivers and the GPU Computing SDK from NVIDIA.

I searched my hard disk after installation and found the following directory: /Developer/GPU Computing/OpenCL. Looks promising.

In the subdirectory src/oclDeviceQuery I found a basic test and I tried to compile it.

$ cd src/oclDeviceQuery
$ make
ld: library not found for -loclUtil
collect2: ld returned 1 exit status
make: *** [../../..//OpenCL//bin//darwin/release/oclDeviceQuery] Error 1

I googled for “-loclUtils”? I found nothing. “liboclUtils”? Nothing. So i found a brand new problem that is not known to mankind. Hurray. ;-)

But i remembered a similiar situation when i used the CUDA-SDK. So i searched the other directories. The solution is to create the library manually.

$ pushd ../../common/
$ make
ar: creating archive ../..//OpenCL//common//lib/liboclUtil.a
q - obj/release/oclUtils.cpp.o
$ popd

So -loclUtil should now be found. And i tried to compile again.

$ make
ld: library not found for -lshrutil
collect2: ld returned 1 exit status
make: *** [../../..//OpenCL//bin//darwin/release/oclDeviceQuery] Error 1

Aha, there’s another library missing. I tried the one in /Developer/GPU Computing/shared.

$ cd ../../../shared/
$ make
src/rendercheckGL.cpp: In member function ‘virtual bool CheckBackBuffer::readback(GLuint, GLuint, GLuint)’:
src/rendercheckGL.cpp:523: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘GLuint’
src/rendercheckGL.cpp:527: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘GLuint’
src/rendercheckGL.cpp: In member function ‘virtual bool CheckFBO::readback(GLuint, GLuint, GLuint)’:
src/rendercheckGL.cpp:1342: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘GLuint’
src/rendercheckGL.cpp:1346: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘GLuint’
a - obj/release/shrUtils.cpp.o
a - obj/release/rendercheckGL.cpp.o
a - obj/release/cmd_arg_reader.cpp.o

Back into the directory with the device query sources.

$ cd ../OpenCL/src/oclDeviceQuery/
$ make

The compilation succeeds, but where’s the executable? It is not in the current directory.

$ ls
Makefile            obj/                oclDeviceQuery.cpp

I searched the directories again and its in a bin subfolder of /Developer/GPU Computing/OpenCL

$ ../../bin/darwin/release/oclDeviceQuery

oclDeviceQuery.exe Starting...

OpenCL SW Info:

 CL_PLATFORM_NAME: 	Apple
 CL_PLATFORM_VERSION: 	OpenCL 1.0 (Jul 15 2009 23:07:32)
 OpenCL SDK Version: 	1.2.0.16
...

That’s it. OpenCL runs on my laptop. Yeah. :-)

Remark: This post was adapted to the new blog format in November 2016.

 "Hyper-Threading with the Intel Core i7" "Schulung 'Ant im Detail'"