> #define somemacro(x) \
>    do { \
>      somestuff; \
>    } while (0)

> Now, why the do-while loop here?

	if (something)
		somemacro(x);
	else
		....

This is a syntax error if somemacro() is { ... } bracketed.  The
do-while makes it eat a semicolon exactly when it should, while not
affecting control flow.

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