C preprocessor: bug or intentional deficiency?

[Doug Gwyn <gwyn>]

> How do I get a C macro to define another macro? Or rather,
> the expansion of a macro causes another macro to be defined.
> ...
> That this does not work, is it a bug in the preprocessor,
> or is it just not supposed to work? If so, why not?

The C preprocessor is NOT a general macro processor,
nor is it intended to be.  If you have m4, use that;
otherwise punt.