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I have installed sway window manager on Fedora 27. The system uses gdm as its login manager. But gdm does not provide sway for selection as the login session. Only Gnome, which is also installed on the system, is shown. I did not had this problem with i3wm, when I tried it.
Is sway compatible with gdm?
yes
Does gdm support wayland or only Xorg?
gdm3 itself runs on wayland. It supports both wayland and Xorg sessions.
How to configure gdm for sway?
You are missing an entry in /usr/share/wayland-sessions. This folder contains wayland desktop session entries for display managers in general. (Respectivly, X desktop session entries are located in /usr/share/xsessions).
Create a file /usr/share/wayland-sessions/sway.desktop with this content:
[Desktop Entry]
Version=1.0
Name=Sway
Comment=Sway - i3 on Wayland
# Please choose matching path
Exec=/usr/bin/sway
#Exec=/usr/local/bin/sway
Type=Application
This entry was missing on my system, too. I've compiled sway from source; wayland-session/xsession entries are rather part of ready-to-use packages. Please make sure the Exec line matches your path to executeable sway.
Note that gdm3 does not show entries in /usr/share/wayland-sessions if your host runs with a proprietary NVIDIA driver. The proprietary NVIDIA driver does not support Wayland. However, the free nouveau driver does.
/usr/share/wayland-sessions rather, since Sway is Wayland based compositor.