Re: [Starpu-devel] hwloc detection problem when configuring starpu-svn-trunk and starpu-1.2.0rc5

[Nathalie Furmento <nathalie.furmento@labri.fr>]

Lucas,

I fixed StarPU (svn trunk and branch 1.2) to always use pkg-config when
detecting hwloc availability. But as Brice said, this should not fix
your problem. It's likely you need to add in your LD_LIBRARY_PATH the
path to the OpenCL library.

Cheers,

Nathalie

Le 18/08/2016 à 11:55, Brice Goglin a écrit :
> Le 18/08/2016 05:21, Lucas M. Schnorr a écrit :
>> Hello Nathalie,
>>
>> On 08/18/2016 01:55 AM, Nathalie Furmento wrote:
>>> Ok, it seems that hwloc has been compiled with OpenCL. Here the error
>>> when configure checks the availability of the hwloc library.
>>>
>>> configure:35295: /home/lschnorr/spack-orion/lib/spack/env/gcc/gcc -o
>>> conftest -O3 -g -O2 -gdwarf-2 -g3    -D_GNU_SOURCE 
>>> -I/home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/include
>>>  
>>> -gdwarf-2 -g3 
>>> -L/home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib
>>> conftest.c -lhwloc  -lrt -lm -lpthread  >&5
>>> /home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib/libhwloc.so:
>>> undefined reference to `clGetPlatformIDs@OPENCL_1.0'
>>> /home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib/libhwloc.so:
>>> undefined reference to `clGetDeviceIDs@OPENCL_1.0'
>>> /home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib/libhwloc.so:
>>> undefined reference to `clGetPlatformInfo@OPENCL_1.0'
>>> /home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib/libhwloc.so:
>>> undefined reference to `clGetDeviceInfo@OPENCL_1.0'
>>>
>>> The dirty fix would be to modify configure.ac and add the proper -l
>>> and -L options for OpenCL. Or better, set LDFLAGS with the
>>> appropriate value.
>>>
>>> A better way would be to use pkgconfig to get the correct flags to
>>> use when compiling/linking with hwloc. Could you please send me the
>>> contents of the file
>>> /home/lschnorr/spack-orion/opt/spack/linux-x86_64/gcc-6.1.0/hwloc-1.11.3-j3wlufl4afo5kvid3vv4rutn55ljz2nx/lib/pkgconfig/hwloc.pc
>>>
>> Sure, here it goes (hwloc.pc).
>>
>> Let me know (on which version/trunk) when it is done so I can test again.
> Hello
>
> You're not supposed to add -lOpenCL since it's private to hwloc, your
> program does not use OpenCL directly. Just linking with -lhwloc should
> be enough as long as the linker finds the OpenCL library in the back
> (same for libnuma).
>
> So the question is whether your linker didn't auto-add libOpenCL.so
> (why? "objdump -x /path/to/libhwloc.so | grep NEEDED" should show
> libOpenCL.so, and "ldd /path/to/libhwloc.so" should find libOpenCL too)
> or whether it tries to add it but failed to find libOpenCL.so (it is
> installed in a standard directory? need LIBRARY_PATH and LD_LIBRARY_PATH?).
>
> I get the same errors when I move libOpenCL to another location, but ld
> first complains "libOpenCL.so.1, needed by libhwloc.so, not found". Your
> linker did not complain the same.
>
> Brice
>
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