gcc 3.0.2 preprocessor token stringization fails

[Neil Booth]

David Thompson wrote:-

> Hi,
> 
> 1) This source code shows a preprocessor failure for gcc-3.0.1
> and gcc-3.0.2 but works correctly in gcc-2.95.3.  Although I am
> using a sun->linux cross compiler, I notice the same failure on
> a native linux gcc-3.0.2 compiler as well.
> 
>   --begin-source: f.c--
>   #define CONCAT2(x,y)        x##y
>   #define CONCAT3(x,y,z)      x##y##z
> 
>   #define QUOTE(macro)        #macro
>   #define QUOTE_MACRO(macro)  QUOTE(macro)
> 
>   #define DEFINE_DEBUGGER(defaultLevel, msgPrefix) \
>      _DEFINE_DEBUGGER(DEBUG_MODULE_NAME, defaultLevel, msgPrefix)
> 
>   #define _DEFINE_DEBUGGER(name, defaultLevel, msgPrefix) \
>     static char *CONCAT3(p,name,MsgPrefix) = \
>     CONCAT3("<",QUOTE_MACRO(name),"> ");

Ah, I see.  Please ignore my previous message, I misread this line.

You cannot paste two string literals and get a string literal.
Instead, change the above line to

#define _DEFINE_DEBUGGER(name, defaultLevel, msgPrefix) \
   static char *CONCAT3(p,name,MsgPrefix) = \
   "<" QUOTE_MACRO(name) "> ";

You don't need the CONCAT3 thing at all - adjacent string literals are
concatenated automatically by the compiler in a different translation
phase.

Neil.