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41e9682efe
The smacro expansion code was virtually impossible to understand, and was leading to very strange failures. Clean it up, and do much better handling of magic macros. This should also allow for recursive macros, but recursive macros are extremely tricky in that it is very hard to keep them from recursing forever, unless there is at least one argument which is never expanded. They are not currently implemented. Even so, I believe token pasting makes it possible to create infinite loops; e.g.: %define foo foo %+ Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>