>@Graham libviennacl-dev has a build-depends on libopencl1 (virtual) and does > not specify a suggested implementation (although this is against policy, so > probably can be filed as a bug against that package) .
I believe you are correct that this is against policy, the build-depends should be on something similar to: ocl-icd-opencl-dev | opencl-dev The real package should be listed before the alternate virtual package. The alternate virtual package is there for users who wish to build packages locally and want to use an alternate package providing opencl- dev, not ocl-icd-opencl-dev. I don't think this is something that Ubuntu should (or can) nip in the bud. I think bugs should be filed in the Debian BTS against the relevant packages (viennacl, etc.) and discussed in the OpenCL Packager's mailing list [1]. [1] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-opencl-devel -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/1328542 Title: [xorg-edgers] OCL-ICD provides a free generic OpenCL implementation, should ubuntu policy be to build applications against this loader vs closed vendor implementations Status in “fglrx-driver” package in Ubuntu: Confirmed Status in “nvidia-graphics-drivers” package in Ubuntu: Confirmed Status in “ocl-icd” package in Ubuntu: Confirmed 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fglrx-driver/+bug/1328542/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
