Add reference to discussion on variadic functions

Closes #53

04-Considering_Safety.md

@@ -138,6 +138,8 @@ But consider refactoring of program logic (for example, additional checking on o
 Variadic functions can accept a variable number of parameters. The probably best known example is printf(). You have the possibility to define this kind of functions by yourself but this is a possible security risk. The usage of variadic functions is not type safe and the wrong input parameters can cause a program termination with an undefined behavior. This undefined behavior can be exploited to a security problem.
 If you have the possibility to use a compiler that supports C++11, you can use variadic templates instead.
 
+[It is technically possible to make typesafe C-style variadic functions with some compilers](https://github.com/lefticus/cppbestpractices/issues/53)
+
 ## Additional Resources
 
 [How to Prevent The Next Heartbleed](http://www.dwheeler.com/essays/heartbleed.html) by David Wheeler is a good analysis of the current state of code safety and how to ensure safe code.