MSVC build problems after updating from git

[John Emmas <john creativepost co uk>]

Firstly, a rider...  I'm using my own-built MSVC projects for building 
glibmm and giomm (i.e. I don't use the ones supplied by git) - but 
having said that, my projects have worked perfectly up until this morning.

After updating from git master this morning I noticed that some new 
sources got added to glibmm (namely, 'glib/src/binding.ccg' and its 
header file, 'binding.hg').  I added them to my project and glibmm built 
perfectly (i.e. my project converts them into the corresponding cc and h 
files).

However, when the build then moved to giomm I suddenly see a lot of 
errors like this (which I've never seen before) and the build fails:-

      DocsParser.pm:lookup_object_of_method(): Warning: 
GtkDefs::lookup_object() failed
          for object name=GNotification, function 
name=g_notification_set_priority
              This may be a missing define-object in a *.defs file.

There are probably half a dozen similar errors (where 'function name' is 
'g_resources_register' / 'g_settings_schema_source_lookup' or 
whatever).  I've never seen these errors before.  Can anyone suggest 
what might be causing them?  A new script that I need to run, maybe??

FWIW all the named 'function names' can be found in 
'gio/src/gio_methods.defs') - except for the very last one which is 
'g_settings_schema_key_range_check' (that one isn't found in any of my 
.defs files).  Does that shed any light on the problem?

Thanks,
John