On Nov 20, 2007, at 7:55 PM, Rich Morin wrote:
> At 15:36 +0100 11/20/07, Joerg Schilling wrote:
>> If you convert to ## and if Dtrace on Solaris still calls
>> /lib/cpp, it will no longer work on Solaris.
>>
>> Check the __CONCAT__ macro in /usr/include/sys/*.h
>
> Well, "grep __CONCAT__ /usr/include/sys/*.h" comes up empty
> on Leopard, so no help there. However, Googling about, I do
> see some examples of __CONCAT__ definitions.
>
> I wonder if I need to do something like this, for portability:
>
> #if __APPLE__
> #define __CONCAT__(A,B) A ## B
> #else
> #define __CONCAT__(A,B) A/**/B
> #endif
>
> then use __CONCAT__ in the following code. Problem is, I
> don't know what the #if test should be. __APPLE__ is a bit
> too specific...
>
> Comments? Clues? Suggestions?
One more thing I just noticed. There is a "__CONCAT"
in /usr/include/sys/cdefs.h:
/*
* The __CONCAT macro is used to concatenate parts of symbol names,
e.g.
* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
* The __CONCAT macro is a bit tricky -- make sure you don't put spaces
* in between its arguments. __CONCAT can also concatenate double-
quoted
* strings produced by the __STRING macro, but this only works with
ANSI C.
*/
James M
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