Compares value1 with value2 according to pspec, and return -1, 0 or +1, if value1 is found to be less than, equal to or greater than value2, respectively.
a valid #GParamSpec
a #GValue of correct type for pspec
-1, 0 or +1, for a less than, equal to or greater than result
Compares value1 with value2 according to pspec, and return -1, 0 or +1, if value1 is found to be less than, equal to or greater than value2, respectively.