From: schaub.johannes@googlemail.com   
      
   The FDIS says that at phase 1 of compilation   
      
   Any source file character not in the basic source character set (2.3) is   
   replaced by the universal-character-name that designates that character.   
      
   And at phase 4 it says   
      
   Preprocessing directives are executed, macro invocations are expanded   
      
   At phase 5, we have   
      
   Each source character set member in a character literal or a string literal,   
   as well as each escape sequence and universal-character-name in a character   
   literal or a non-raw string literal, is converted to the corresponding   
   member of the execution character set   
      
   For the # operator, we have   
      
   a \ character is inserted before each " and \ character of a character   
   literal or string literal (including the delimiting " characters).   
      
   Hence I conducted the following test   
      
   #define GET_UCN(X) #X   
   GET_UCN("€")   
      
   With an input character set of UTF-8 (matching my file's encoding), I   
   expected the following preprocessing result of the #X operation:   
   "\"\\u20AC\"". GCC, Clang and boost.wave don't transform the € into a UCN   
   and instead yield "\"€\"". I feel like I'm missing something. Also, is the   
   spelling 20AC or 20ac? Or is this left unspecified? Can you please explain?   
      
      
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