[meta-xilinx] meta-xilinx-tools fails on "device-tree-generation" script

[Jean-Francois Dagenais]

> On Aug 31, 2017, at 22:21, Manjukumar Harthikote Matha <MANJUKUM at xilinx.com> wrote:
> 
> Something in upstream has changed causing DISPLAY variable not being passed from environment. They all fail saying Xvfb is not available. You can see the log.do_configure or log.do_compile

Yocto builds can be run in environment which do not have DISPLAY set. e.g. a server, or a docker container. The tools should not expect this variable to be set. I had to install Xvfb in my yocto builder docker image and add /usr/bin to the PATH env variable at the top of classes/xsct-tc.bbclass since xvfb is not provided in the yocto staging sysroot (I don't have X11 in my DISTRO_FEATURES).

Using /usr/bin is not so clean, but building it inside yocto without "x11" in DISTRO_FEATURES seemed way more complicated. I figured hacking xsct-tc.bbclass was a low-impact compromise. Has been working great in my production environment for months now. I've submitted the patch in the past but it was deferred for obvious reasons.

The problem is not going to go away so this may be the time to reconsider my previous patch. https://www.mail-archive.com/meta-xilinx@yoctoproject.org/msg01662.html

Cheers!