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And what is that reason?

Sorry for the confusion. "If I put __FUNCTION__ inside main() instead of through a macro the result is the same" meant yes.

Anyway, I now believe there's no solution - concatenating __FUNCTION__...

Yes. I investigated a little further, and came to this : the following code

#define FOOBAR const char* __fnname = __FUNCTION__ "A";
#define QUUX const char* __fnname = __FILE__ "A";

int main...

Hi guys, my first post here.

I'm having trouble doing string concatenation at the preprocessor level.

This works fine :

#define A "TOKEN1" "TOKEN2"
and this also works fine:

#define A...