Add g_abort()

The new g_abort() macro just expands to abort() on systems where abort()
behaves in a sane way. On other systems (read: Windows) it does its best
to emulate a sane abort() behaviour.

https://bugzilla.gnome.org/show_bug.cgi?id=665446

glib/gutils.c

@@ -2390,3 +2390,27 @@ g_check_setuid (void)
   return FALSE;
 #endif
 }
+
+/**
+ * g_abort:
+ *
+ * A wrapper for the POSIX abort() function.
+ *
+ * On Windows it is a function that makes extra effort (including a call
+ * to abort()) to ensure that a debugger-catchable exception is thrown
+ * before the program terminates.
+ *
+ * See your C library manual for more details about abort().
+ *
+ * Since: 2.50
+ */
+void
+g_abort (void)
+{
+  /* One call to break the debugger */
+  DebugBreak ();
+  /* One call in case CRT does get saner about abort() behaviour */
+  abort ();
+  /* And one call to bind them all and terminate the program for sure */
+  ExitProcess (127);
+}

glib/gutils.h

@@ -299,6 +299,16 @@ g_bit_storage_impl (gulong number)
 #endif
 }
 
+/* Crashes the program. */
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_50
+#ifndef G_OS_WIN32
+#  define g_abort() abort ()
+#else
+GLIB_AVAILABLE_IN_2_50
+void g_abort (void) G_GNUC_NORETURN G_ANALYZER_NORETURN;
+#endif
+#endif
+
 #ifndef G_DISABLE_DEPRECATED
 
 /*