> #define addr 192.186.2.5
> #define mask 255.255.240.0
>
> #define rule(ADDR,MASK) add pass tcp from ADDR ## : ## MASK to any 25 setup
> rule(addr,mask)
This is a well-known artifact of the ANSI C rules. You need to do two levels
of macro in order to get the macro args expanded in the paste operator:
#define addr 1.2.3.4
#define mask 255.255.255.0
#define hn(A,M) A ## : ## M
#define rule(A,M) add pass tcp from hn(A,M) to any 25 setup
rule(addr, mask)
which produces
add pass tcp from 1.2.3.4:255.255.255.0 to any 25 setup
when fed through an ANSI preprocessor (i.e. not "gcc -E" and not /usr/bin/cpp
on 3.x!). This also works if (e.g.) addr is defined on the command line.
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