Cannot build with Vala 0.7.6

[Jan M.]

Building libdesktop-agnostic 0.0.1-bzr343-trunk on Arch Linux fails with:

./waf configure --config-backends=keyfile --vfs-backends=gio --desktop-entry-backends=glib
Configuring libdesktop-agnostic 0.0.1-bzr343-trunk
Checking for program gcc : ok /usr/bin/gcc
Checking for program cpp : ok /usr/bin/cpp
Checking for program ar : ok /usr/bin/ar
Checking for program ranlib : ok /usr/bin/ranlib
Checking for gcc : ok
Checking for program valac : ok /usr/bin/valac
Checking for gthread-2.0 : ok
Checking for program version valac >= 0.1.6 : ok 0.7.6
Checking for program python : ok /usr/bin/python
Checking for gmodule-2.0 >= 2.6.0 : ok
Checking for glib-2.0 >= 2.10.0 : ok
Checking for gobject-2.0 >= 2.12.0 : ok
Checking for library m : ok
Checking for gdk-2.0 >= 2.12.0 : ok
Checking for gtk+-2.0 >= 2.12.0 : ok
Checking for thunar-vfs-1 : ok
Checking for dbus-glib-1 : ok
Checking for gobject-introspection-1.0 >= 0.6.3 : ok
Checking for Python version : 2.6.2
Checking for library python2.6 : ok
Checking for program python2.6-config : ok /usr/bin/python2.6-config
Checking for header Python.h : ok
Checking for pygobject-2.0 >= 2.12.0 : ok
Checking for program pygobject-codegen-2.0 : ok /usr/bin/pygobject-codegen-2.0
Checking for pygobject-2.0 >= 2.15.2 : ok
'configure' finished successfully (0.686s)

./waf
[...]
[ 20/113] valac: libdesktop-agnostic/vfs-impl-gio.vala libdesktop-agnostic/vfs-file-impl-gio.vala libdesktop-agnostic/vfs-file-monitor-impl-gio.vala libdesktop-agnostic/vfs-trash-impl-gio.vala libdesktop-agnostic/vfs-volume-impl-gio.vala -> build/default/libdesktop-agnostic/vfs-impl-gio.c build/default/libdesktop-agnostic/da-vfs-gio.h build/default/libdesktop-agnostic/da-vfs-gio.vapi build/default/libdesktop-agnostic/da-vfs-gio.deps build/default/libdesktop-agnostic/vfs-file-impl-gio.c build/default/libdesktop-agnostic/da-vfs-gio.h build/default/libdesktop-agnostic/da-vfs-gio.vapi build/default/libdesktop-agnostic/da-vfs-gio.deps build/default/libdesktop-agnostic/vfs-file-monitor-impl-gio.c build/default/libdesktop-agnostic/da-vfs-gio.h build/default/libdesktop-agnostic/da-vfs-gio.vapi build/default/libdesktop-agnostic/da-vfs-gio.deps build/default/libdesktop-agnostic/vfs-trash-impl-gio.c build/default/libdesktop-agnostic/da-vfs-gio.h build/default/libdesktop-agnostic/da-vfs-gio.vapi build/default/libdesktop-agnostic/da-vfs-gio.deps build/default/libdesktop-agnostic/vfs-volume-impl-gio.c build/default/libdesktop-agnostic/da-vfs-gio.h build/default/libdesktop-agnostic/da-vfs-gio.vapi build/default/libdesktop-agnostic/da-vfs-gio.deps
libdesktop-agnostic/vfs-volume-impl-gio.vala:116.59-116.71: error: Argument 4: Cannot convert from `DesktopAgnostic.VFS.VolumeGIO.on_mount' to `GLib.AsyncReadyCallback?'
libdesktop-agnostic/vfs-volume-impl-gio.vala:150.56-150.70: error: Argument 3: Cannot convert from `DesktopAgnostic.VFS.VolumeGIO.on_unmount' to `GLib.AsyncReadyCallback?'
libdesktop-agnostic/vfs-volume-impl-gio.vala:187.55-187.67: error: Argument 3: Cannot convert from `DesktopAgnostic.VFS.VolumeGIO.on_eject' to `GLib.AsyncReadyCallback?'
libdesktop-agnostic/vfs-trash-impl-gio.vala:69.29-69.47: error: Argument 5: Cannot convert from `DesktopAgnostic.VFS.TrashGIO.on_trash_count' to `GLib.AsyncReadyCallback?'
Waf: Leaving directory `/var/abs/local/libdesktop-agnostic/src/libdesktop-agnostic-build/build'
Build failed
 -> task failed (err #1):
 {task: valac_task vfs-impl-gio.vala,vfs-file-impl-gio.vala,vfs-file-monitor-impl-gio.vala,vfs-trash-impl-gio.vala,vfs-volume-impl-gio.vala -> vfs-impl-gio.c,da-vfs-gio.h,da-vfs-gio.vapi,da-vfs-gio.deps,vfs-file-impl-gio.c,da-vfs-gio.h,da-vfs-gio.vapi,da-vfs-gio.deps,vfs-file-monitor-impl-gio.c,da-vfs-gio.h,da-vfs-gio.vapi,da-vfs-gio.deps,vfs-trash-impl-gio.c,da-vfs-gio.h,da-vfs-gio.vapi,da-vfs-gio.deps,vfs-volume-impl-gio.c,da-vfs-gio.h,da-vfs-gio.vapi,da-vfs-gio.deps,da-vfs-gio.h}

[Mark Lee (malept)]

libdesktop-agnostic won't build with Vala 0.7.6 due to regressions in that release.

[Mark Lee (malept)]

See also:

https://bugzilla.gnome.org/show_bug.cgi?id=595639
https://bugzilla.gnome.org/show_bug.cgi?id=595587

[Michal Hruby (mhr3)]

There's the same error with Vala 0.7.7.

[Mark Lee (malept)]

Minimum version of Vala required is now 0.7.7.