1759054 - Allow webrtc to be built on Wayland without X11

Status: RESOLVED INVALID

(Core :: Widget: Gtk, enhancement)

Description

[michel]

Building Firefox without X11 requires webrtc to be disabled (Bug 1661450). As stransky suggested (https://bugzilla.mozilla.org/show_bug.cgi?id=1661450#c63), I'm opening this new bug for allowing building with webrtc enabled.

I started trying to disable x11 flags in third_party/libwebrtc/, the changes required are simple:

• disable use_x11 in third_party/libwebrtc/build/config/ui.gni
• disable rtc_use_x11 in third_party/libwebrtc/webrtc.gni

Then run GN=... DEPOT_TOOLS=... bash dom/media/webrtc/third_party_build/gn-configs/generate-gn-build-files.sh to re-generate the mozilla build files.

It works, builds fine. However, I'm encountering 2 issues:

• How to use a flag from the mozilla build system (MOZ_X11) in the libwebrtc gni files (if MOZ_X11: use_x11 and if MOZ_X11: rtc_use_x11)?
• Running generate-gn-build-files.sh correctly updates the mozilla build system, however the files are different when using X11 compared to when not. Is there a way to generate if CONFIG['MOZ_X11'] in the resulting moz.build files? Or would that mean add a MOZ_X11 mozbuild_args to the JSON files in dom/media/webrtc/third_party_build/gn-configs and duplicate all the files to have two versions: respectively with and without X11?