linux-kernel - macros: "do-while" versus "({ })" and a compile-time error

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Message-ID: <Pine.LNX.4.64.0701081347410.32420@localhost.localdomain>
Date:	Mon, 8 Jan 2007 13:50:31 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: macros:  "do-while" versus "({ })" and a compile-time error

  just to stir the pot a bit regarding the discussion of the two
different ways to define macros, i've just noticed that the "({ })"
notation is not universally acceptable.  i've seen examples where
using that notation causes gcc to produce:

  error: braced-group within expression allowed only inside a function

i wasn't aware that there were limits on this notation.  can someone
clarify this?  under what circumstances *can't* you use that notation?
thanks.

rday
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