In writing cross platform code I often have to deal with function
arguments or variables that are not used on certain platforms.
In FreeBSD:sys/cdefs.h we have
#define __unused __attribute__((__unused__))
and in the kernel we tend to annotate with "__unused" such arguments
int f(type foo __unused)
However on linux __unused is not a standard macro, and is often
used as a variable or field name in standard headers, so introducing
our __unused macro breaks compilation there.
The alternative way to avoid an 'unused' warning from the compiler
is an empty statement
(void)foo;
that the compiler hopefully optimizes away.
Any disadvantage or objection to selectively use this form
in our kernel code for parts that need to work on multiple
platforms ?
cheers
luigi
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