https://bugs.exim.org/show_bug.cgi?id=2916
--- Comment #7 from Martin Kealey <from-exim-bugzilla@???> ---
The UNUSED macro is to silence the compiler warnings.
The problem is, different compilers have different tricks to achieve this.
GCC and some others accept a suffix like __attribute__((unused)) after the
parameter name; some accept a magic parameter name like __UNUSED__; and some
simply accept a parameter with its name omitted (like a prototype); some simply
don't complain in the first place, in which case an ordinary parameter will
suffice. Others require a redundant «param=param;» statement, or some kind of
#pragma.
Having a parameterized UNUSED macro allows the appropriate method to be
selected at least among the first 4 kinds.
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