Follow-up Comment #7, bug #11022 (project grep):
The "do { ... } while (0)" makes it the syntactical equivalent of a function
call. Consider
#define F(x) if (x) h(x)
#define G(x) do { if (x) h(x); } while (0)
{
if (y)
F(x);
else
z++;
if (y)
G(x);
else
z++;
}
and match the "else" statements to their corresponding "if". (Code
indentation will probably be lost on the Savannah web page.)
The construct will otherwise usually be removed by the optimizer.
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