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nvidia-libopencl1-304 conflict..

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https://bugs.launchpad.net/bugs/1328542

Title:
  Build dependency on virtual libopencl1 with no default

Status in fglrx-driver package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid
Status in ocl-icd package in Ubuntu:
  Invalid
Status in viennacl package in Ubuntu:
  Fix Released
Status in viennacl package in Debian:
  Fix Released

Bug description:
  Relevant Packages: ocl-icd-libopencl1

  Applications that wish to use OpenCL encounter a few problems when you
  attempt to distribute them.

  PROBLEM:

  Applications compiled against one implementation of OpenCL
  (libOpenCL.so) will not run on a system with another implementation
  installed. OpenCL loader library is supposed to be agnostic to the
  kernel loaded (nvidia libOpenCL.so will run amd kernels for example)
  but testing has shown significant performance differences when using
  OpenCL implementations from different vendors. System must have
  libOpenCL.so used at build time in order to run an application using
  OpenCL

  As the number of OpenCL applications grows there will be packaging
  conflicts between those built against nvidia/ocl and potentially other
  vendor OpenCL implementations as they are added to ubuntu.

  Solution:

  ocl-icd-libopencl1 (http://packages.ubuntu.com/trusty/ocl-icd-
  libopencl1) provides an open source implementation of libOpenCL.so
  that will work with vendor OpenCL kernels files provided by
  intel/nvidia/amd.

  Policy for packages to use ocl-icd as the default implementation,
  allowing the use of other kernel loaders for alternative packages in
  the same source package(if desired)

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