Better errors for keymap compilation failure

$ weston --version
weston 5.0.0

$ cat .config/weston.ini
[core]
xwayland=true

[libinput]
enable_tap=true

[shell]
allow-zap=true

[keyboard]
keymap_layout=fi,sv,us
vt-switching=true

What I do

Open a terminal, attempt to type in it

What I expect to happen

Text appears in the terminal

What happens instead

Weston core dumps. Sometimes the console indicates a segmentation fault.

Steps to reproduce

• Set .config/weston.ini to match above
• Run weston from a pseudo-TTY
• Open Weston Terminal
• Try to type

Workaround

Commenting out keymap_layout fixes the crashing but forces US layout.