OpenCL disabled on nvidia

[Ric Flomag]

OpenCL is not enabled by default.

Steps to reproduce :
 * install the nvidia driver
 * install darktable
 * run darktable on command line : $darktable -d opencl

=>
[opencl_init] could not find opencl runtime library 'libOpenCL'
0.159268 [opencl_init] could not find opencl runtime library 'libOpenCL.so'
0.159327 [opencl_init] could not find opencl runtime library 'libOpenCL.so.1'
0.159333 [opencl_init] no working opencl library found. Continue with opencl disabled
0.159336 [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.

Workaround : install package nvidia-opencl-dev

Should darktable depend on nvidia-opencl-dev ?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: darktable 2.4.2-1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 10 23:49:56 2018
InstallationDate: Installed on 2018-04-09 (1 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180407)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: darktable
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Erich Eickmeyer (eeickmeyer)]

> Should darktable depend on nvidia-opencl-dev

No, because that would potentially install nvidia dependencies for those that don't need it. Therefore, those that need opencl support on nvidia should do as you did and install nvidia-opencl-dev.

Closing this as this was a support issue, not a packaging issue, and should never have been open in the bug tracker as bug trackers are not places for support questions.