Checks that the GLib library in use is compatible with the given version. Generally you would pass in the constants GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION as the three arguments to this function; that produces a check that the library in use is compatible with the version of GLib the application or module was compiled against. Compatibility is defined by two things: first the version of the running library is newer than the version required_major.required_minor.required_micro. Second the running library must be binary compatible with the version required_major.required_minor.required_micro (same major version.) Since 2.6
GLib provides version information, primarily useful in configure checks for builds that have a configure script. Applications will not typically use the features described here.
The GLib headers annotate deprecated APIs in a way that produces compiler warnings if these deprecated APIs are used. The warnings can be turned off by defining the macro GLIB_DISABLE_DEPRECATION_WARNINGS before including the glib.h header.
GLib also provides support for building applications against defined subsets of deprecated or new GLib APIs. Define the macro GLIB_VERSION_MIN_REQUIRED to specify up to what version of GLib you want to receive warnings about deprecated APIs. Define the macro GLIB_VERSION_MAX_ALLOWED to specify the newest version of GLib whose API you want to use.