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    DateMon, 1 Jan 2007 16:37:20 +0100 (MET)
    FromJan Engelhardt <>
    SubjectRe: [PATCH] Documentation: Explain a second alternative for multi-line macros.
    On Dec 31 2006 19:23, Randy Dunlap wrote:
    >> > 
    >> > #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.
    
    If people want to return something from a ({ }) construct, they should do it
    explicitly, e.g.
    #define setcc(cc) ({ \
    	partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
    	partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); \
    	partial_status; \
    })
    
    	-`J'
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