====== The GNU C Preprocessor ======
~~META:url=http://tigcc.ticalc.org/doc/cpp.html~~

Page that contains the __very__ useful Stringification documentation:

If you want to stringify the result of expansion of a macro argument, you have to use two levels of macros.

  #define xstr(s) str(s)
  #define str(s) #s
  #define foo 4
  str (foo)
expands to "foo"
  xstr (foo)
expands to xstr (4)\\
expands to str (4)\\
expands to "4"

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