[Qt5] Add Qt5Wayland

[barche]

WIP attempt to fix #3551

[barche]

The failures are because wayland-scanner, a tool used during compilation and provided by Wayland_jll, segfaults. No idea why.

[giordano]

The failures are because wayland-scanner, a tool used during compilation and provided by Wayland_jll, segfaults. No idea why.

Using the wrong one?

Yggdrasil/G/GTK3/build_tarballs.jl

Lines 69 to 70 in 7702d6c

	# Need a host Wayland for wayland-scanner
	HostBuildDependency("Wayland_jll"),

[barche]

Using the wrong one?

Yes, that was it, thanks :)

[giordano]

It isn't clear to me how this solves #3551. Does the user need to install this package?

[barche]

It isn't clear to me how this solves #3551. Does the user need to install this package?

The package needs to be installed and its plugins/platforms dir added to the list of platform plugin directories (don't know how yet). But having just compared the contents of that directory against what I have on my Arch Linux system, I think we are missing at least libqwayland-egl.so for this to be useful (currently only the libqwayland-generic.so platform module is there).

[mkitti]

Could we revisit this?

With the removal of the alternate binaries mechanism in GR.jl, support on Wayland is broken now.

[barche]

I'm not sure how to test this. I just tried Plasma on Wayland on my Arch installation, and on a fresh Plots installation the GKS Qt window shows up as normal after spitting the warning

qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""

I assume it's falling back to X11 emulation, and checking that the warning stays away is a good test?

[mkitti]

Here's the original issue:
sciapp/gr#141

[mkitti]

Oh, hmm..

[barche]

Oh, this was accidental, I thought something went wrong with my Yggdrasil fork so I recreated it.