Spaces in macro expansion in a #include?

[xuinkrbin.]

Given a macro:

#define A(x) #x
#define B 1
#define C 2
#define D B C

If I have the following:

#include A(D)

GCC seems to expand the macro to:

"12"

and search for a file named "12" instead of "1 2".
If I have just:

D

GCC seems to expand the macro to:

1 2

This behavior seems inconsistent. Is it documented anywhere? Searching as I
might turns up no information.



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