branch master updated: doc: Only use GDM and GNOME on x86_64.

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The following commit(s) were added to refs/heads/master by this push:
     new 0fea9aec59 doc: Only use GDM and GNOME on x86_64.
0fea9aec59 is described below

commit 0fea9aec59f8f328c269d585d849a8f954e39aae
Author: Ricardo Wurmus <rekado@elephly.net>
AuthorDate: Wed Jan 5 21:46:41 2022 +0100

    doc: Only use GDM and GNOME on x86_64.
    
    * gnu/system/examples/desktop.tmpl: Only use gnome-desktop-service-type and
    the default login manager in set-xorg-configuration when the target system 
is
    x86_64.
---
 gnu/system/examples/desktop.tmpl | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/gnu/system/examples/desktop.tmpl b/gnu/system/examples/desktop.tmpl
index a209fbcb05..7055a8f92d 100644
--- a/gnu/system/examples/desktop.tmpl
+++ b/gnu/system/examples/desktop.tmpl
@@ -2,8 +2,8 @@
 ;; for a "desktop" setup with GNOME and Xfce where the
 ;; root partition is encrypted with LUKS, and a swap file.
 
-(use-modules (gnu) (gnu system nss))
-(use-service-modules desktop xorg)
+(use-modules (gnu) (gnu system nss) (guix utils))
+(use-service-modules desktop sddm xorg)
 (use-package-modules certs gnome)
 
 (operating-system
@@ -74,12 +74,25 @@
   ;; by clicking the gear.  Use the "desktop" services, which
   ;; include the X11 log-in service, networking with
   ;; NetworkManager, and more.
-  (services (append (list (service gnome-desktop-service-type)
-                          (service xfce-desktop-service-type)
-                          (set-xorg-configuration
-                           (xorg-configuration
-                            (keyboard-layout keyboard-layout))))
-                    %desktop-services))
+  (services (if (target-x86-64?)
+                (append (list (service gnome-desktop-service-type)
+                              (service xfce-desktop-service-type)
+                              (set-xorg-configuration
+                               (xorg-configuration
+                                (keyboard-layout keyboard-layout))))
+                        %desktop-services)
+
+                ;; FIXME: Since GDM depends on Rust (gdm -> gnome-shell -> gjs
+                ;; -> mozjs -> rust) and Rust is currently unavailable on
+                ;; non-x86_64 platforms, we use SDDM and Mate here instead of
+                ;; GNOME and GDM.
+                (append (list (service mate-desktop-service-type)
+                              (service xfce-desktop-service-type)
+                              (set-xorg-configuration
+                               (xorg-configuration
+                                (keyboard-layout keyboard-layout))
+                               sddm-service-type))
+                        %desktop-services)))
 
   ;; Allow resolution of '.local' host names with mDNS.
   (name-service-switch %mdns-host-lookup-nss))