Errors with cl2.hpp about opencl-clhpp

[jrprice]

Linker flag order matters with GCC, try putting the -lOpenCL at the end of the command-line:

g++ -std=c++17 dummy.cpp -o dummy -lOpenCL

This resolves the issue for me.

[sampie]

I also tested with different system having beignet and the result looks the same:

/tmp/ccEVrV8e.o: In function cl::detail::ReferenceHandler<_cl_device_id*>::release(_cl_device_id*)': dummy.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP13_cl_device_idE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP13_cl_device_idE7releaseES3_]+0x14): undefined reference to clReleaseDevice'
/tmp/ccEVrV8e.o: In function cl::detail::ReferenceHandler<_cl_context*>::release(_cl_context*)': dummy.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_]+0x14): undefined reference to clReleaseContext'
/tmp/ccEVrV8e.o: In function cl::detail::ReferenceHandler<_cl_command_queue*>::release(_cl_command_queue*)': dummy.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_]+0x14): undefined reference to clReleaseCommandQueue'
collect2: error: ld returned 1 exit status
Makefile:2: recipe for target 'all' failed

[sampie]

Hi,

Thank you! This solves the issue!

[rajhlinux]

Thanks I had the same issue to compile Caffe with viennacl. I had to put the flag "-lOpenCL" to the cmakelist.txt flags.