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    SubjectRe: [PATCH] Documentation: Explain a second alternative for multi-line macros.
    Segher Boessenkool wrote:
    >>> In this case, the second form
    >>> should be used when the macro needs to return a value (and you can't
    >>> use an inline function for whatever reason), whereas the first form
    >>> should be used at all other times.
    >> that's a fair point, although it's certainly not the coding style
    >> that's in play now. for example,
    >> #define setcc(cc) ({ \
    >> partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
    >> partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
    > This _does_ return a value though, bad example.

    Where does it return a value? I don't see any uses of it
    in arch/i386/math-emu/* that use it as returning a value.

    And with a small change to put it inside a do-while block
    instead of ({ ... }), it at least builds cleanly.
    I expected some complaints.

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      Last update: 2007-01-01 04:41    [W:0.023 / U:232.664 seconds]
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