From owner-freebsd-hackers@FreeBSD.ORG  Sun Jan 30 17:29:41 2011
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Date: Sun, 30 Jan 2011 17:29:41 +0000
From: Alexander Best <arundel@freebsd.org>
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Subject: empty function macros
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hi there,

i noticed freebsd has a few of the following macros:

#define FUNC(sb)

when you do something like

if (cond)
    FUNC(i)

the compiler complains about an if statement with an empty body. any sensible
way of dealing with this issue?

i saw some reiserfs code which does the following to silence compilers:

#define FUNC(sb) do { } while (0)

cheers.
alex

-- 
a13x