Found the following significant warnings:
  atkClasses.c:1054:25: warning: assignment to 'void (*)(AtkObject *, guint,  void *)' {aka 'void (*)(struct _AtkObject *, unsigned int,  void *)'} from incompatible pointer type 'void (*)(AtkObject *, guint,  AtkObject *)' {aka 'void (*)(struct _AtkObject *, unsigned int,  struct _AtkObject *)'} [-Wincompatible-pointer-types]
  atkClasses.c:1062:34: warning: assignment to 'void (*)(AtkObject *, void **)' {aka 'void (*)(struct _AtkObject *, void **)'} from incompatible pointer type 'void (*)(AtkObject *, AtkObject *)' {aka 'void (*)(struct _AtkObject *, struct _AtkObject *)'} [-Wincompatible-pointer-types]
  atkClasses.c:1401:51: warning: passing argument 2 of 'object_class->active_descendant_changed' from incompatible pointer type [-Wincompatible-pointer-types]
  atkConversion.c:97:36: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  atkConversion.c:136:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:54:35: warning: the address of 'pathNames' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:149:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:171:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:196:36: warning: the address of 'listNames' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:228:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  cairoConversion.c:267:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:249:37: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:267:36: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:302:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:335:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:389:34: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:419:36: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:454:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:496:36: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkConversion.c:663:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gdkFuncs.c:6000:36: warning: passing argument 2 of 'gdk_window_get_user_data' from incompatible pointer type [-Wincompatible-pointer-types]
  gioClasses.c:1974:17: warning: assignment to 'gssize (*)(GOutputStream *, const void *, gsize,  GCancellable *, GError **)' {aka 'long long int (*)(struct _GOutputStream *, const void *, long long unsigned int,  struct _GCancellable *, struct _GError **)'} from incompatible pointer type 'gssize (*)(GOutputStream *, const guchar *, gsize,  GCancellable *, GError **)' {aka 'long long int (*)(struct _GOutputStream *, const unsigned char *, long long unsigned int,  struct _GCancellable *, struct _GError **)'} [-Wincompatible-pointer-types]
  gioClasses.c:1990:20: warning: assignment to 'void (*)(GOutputStream *, const void *, gsize,  int,  GCancellable *, void (*)(GObject *, GAsyncResult *, void *), void *)' {aka 'void (*)(struct _GOutputStream *, const void *, long long unsigned int,  int,  struct _GCancellable *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)'} from incompatible pointer type 'void (*)(GOutputStream *, const guchar *, gsize,  int,  GCancellable *, void (*)(GObject *, GAsyncResult *, void *), void *)' {aka 'void (*)(struct _GOutputStream *, const unsigned char *, long long unsigned int,  int,  struct _GCancellable *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)'} [-Wincompatible-pointer-types]
  gioConversion.c:16:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  glib.c:265:39: warning: the address of 'classes' will always evaluate as 'true' [-Waddress]
  gtkAccessors.c:1232:43: warning: the address of 'val' will always evaluate as 'true' [-Waddress]
  gtkClasses.c:8831:28: warning: assignment to 'gboolean (*)(GtkNotebook *, gint)' {aka 'int (*)(struct _GtkNotebook *, int)'} from incompatible pointer type 'void (*)(GtkNotebook *, gint)' {aka 'void (*)(struct _GtkNotebook *, int)'} [-Wincompatible-pointer-types]
  gtkClasses.c:11314:21: warning: assignment to 'gboolean (*)(GtkScrolledWindow *, GtkScrollType,  gboolean)' {aka 'int (*)(struct _GtkScrolledWindow *, enum <anonymous>,  int)'} from incompatible pointer type 'void (*)(GtkScrolledWindow *, GtkScrollType,  gboolean)' {aka 'void (*)(struct _GtkScrolledWindow *, enum <anonymous>,  int)'} [-Wincompatible-pointer-types]
  gtkClasses.c:24141:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkClasses.c:24219:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkClasses.c:24276:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkClasses.c:24298:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:25:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:58:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:102:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:167:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:209:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkConversion.c:256:35: warning: the address of 'names' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:3904:100: warning: the address of 'requisition' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:6593:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:18182:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:18202:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:18222:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:18256:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27313:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27334:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27354:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27374:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27393:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27412:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27432:88: warning: the address of 'start' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27432:226: warning: the address of 'end' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27453:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27473:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27604:88: warning: the address of 'start' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:27604:226: warning: the address of 'end' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29152:100: warning: the address of 'match_start' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29152:256: warning: the address of 'match_end' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29178:100: warning: the address of 'match_start' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29178:256: warning: the address of 'match_end' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29894:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29916:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:29960:100: warning: the address of 'target_iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:32492:106: warning: the address of 'selection_data' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33140:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33162:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33201:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33222:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33300:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33357:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33379:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33625:100: warning: the address of 'filter_iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33645:98: warning: the address of 'child_iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33792:96: warning: the address of 'sort_iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33829:98: warning: the address of 'child_iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:33991:146: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:34406:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:34427:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:34448:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:34468:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:34488:86: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:37680:100: warning: the address of 'requisition' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:37714:100: warning: the address of 'requisition' will always evaluate as 'true' [-Waddress]
  gtkFuncs.c:58643:100: warning: the address of 'requisition' will always evaluate as 'true' [-Waddress]
  gtkManuals.c:748:25: warning: the address of 'value' will always evaluate as 'true' [-Waddress]
  gtkManuals.c:1056:25: warning: the address of 'value' will always evaluate as 'true' [-Waddress]
  gtkManuals.c:1090:25: warning: the address of 'value' will always evaluate as 'true' [-Waddress]
  gtkManuals.c:1318:298: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  gtkManuals.c:1347:298: warning: the address of 'iter' will always evaluate as 'true' [-Waddress]
  pangoAccessors.c:658:43: warning: the address of 'val' will always evaluate as 'true' [-Waddress]
  pangoConversion.c:85:35: warning: the address of 'classes' will always evaluate as 'true' [-Waddress]
See 'd:/Rcompile/CRANpkg/local/4.2/RGtk2.Rcheck/00install.out' for details.