FTBFS with Vala 0.56.18 (Compact class cannot inherit from non-compact class)

[bobby285271]

What Happened?

👋 Hi, both 0.17.2 and current master fails to build with vala 0.56.18 for me.

I think this is caused by https://gitlab.gnome.org/GNOME/vala/-/commit/34e2c6c5dcf5e89a7bec017bf440bb5e64aa4a77

Full log: monitor-build-log.txt

As a workaround we removed all usages of [compact]: NixOS/nixpkgs@9bb3569

../src/Resources/Hwmon/HwmonTemperature.vala:11.1-11.46: error: Compact class `Monitor.HwmonTemperature' cannot inherit from non-compact class `GLib.Object'
   11 | public class Monitor.HwmonTemperature : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/CPUCache.vala:9.1-9.38: error: Compact class `Monitor.CPUCache' cannot inherit from non-compact class `GLib.Object'
    9 | public class Monitor.CPUCache : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Storage/Volume.vala:7.1-7.36: error: Compact class `Monitor.Volume' cannot inherit from non-compact class `GLib.Object'
    7 | public class Monitor.Volume : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Hwmon/HwmonVoltage.vala:10.1-10.42: error: Compact class `Monitor.HwmonVoltage' cannot inherit from non-compact class `GLib.Object'
   10 | public class Monitor.HwmonVoltage : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Hwmon/HwmonFrequency.vala:10.1-10.44: error: Compact class `Monitor.HwmonFrequency' cannot inherit from non-compact class `GLib.Object'
   10 | public class Monitor.HwmonFrequency : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Hwmon/HwmonFan.vala:10.1-10.38: error: Compact class `Monitor.HwmonFan' cannot inherit from non-compact class `GLib.Object'
   10 | public class Monitor.HwmonFan : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Hwmon/HwmonPWM.vala:10.1-10.38: error: Compact class `Monitor.HwmonPWM' cannot inherit from non-compact class `GLib.Object'
   10 | public class Monitor.HwmonPWM : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
../src/Resources/Hwmon/HwmonPower.vala:10.1-10.40: error: Compact class `Monitor.HwmonPower' cannot inherit from non-compact class `GLib.Object'
   10 | public class Monitor.HwmonPower : Object {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
Compilation failed: 8 error(s), 0 warning(s)

Steps to Reproduce

1. Build with Vala 0.56.18

Expected Behavior

Builds.

OS Version

NixOS unstable

Session Type

Classic Session (X11, This is the default)

Software Version

Compiled from git

Log Output

monitor-build-log.txt

Hardware Info

No response

[Tbusk]

Hi, I also get this on endeavorOS on Wayland, and that solution removes the errors from the build process.

My Vala version is 0.56.18-5.