Messages in this thread | | | Date | Tue, 09 Jan 2007 09:08:37 -0800 | From | "H. Peter Anvin" <> | Subject | Re: macros: "do-while" versus "({ })" and a compile-time error |
| |
Robert P. J. Day wrote: > 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. >
Well, you can apparently not use it as a part of a constant expression (which makes sense; do-while is illegal there too.) That would be the only case in which an expression is permitted outside a function at all.
-hpa
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |