'sizeof' in preprocessing.

[Henry Spencer]

In article <1990Oct6.092032.345 at csc.canberra.edu.au> eyal at echo.canberra.edu.au (Eyal Lebedinsky) writes:
>Reading the standard, any 'constant-expression' is valid for #if, and sizeof
>is yielding a constant...
>No separate cpp will do it (unless it learns some C).
>Comments? I was reading 3.8.1 7/88 draft.

You've either missed something or your draft is simply too far out of date.
(I can't remember what this looked like in 7/88.)  A very subtle point of
the interpretation of #if expressions is that keywords are not recognized
at all, so there is no way to write a sizeof.  This is specifically there to
permit separate preprocessors.
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