> Here's something that should work in any compiler.  If you try to
> invoke it with s not being a string literal, you get a syntax error.

> #define literalstrlen(s) (sizeof("" s) - 1)

<pedant>
Well, many non-string-literals.  You can invoke it with some things
that aren't in themselves valid expressions, like literalstrlen([0]),
and even some that are valid expressions, like literalstrlen(-1).  The
only thing I've been able to come up with that is both a valid to this
and valid in a "const char *" context is +0.
</pedant>

That aside, it's probably close enough for these purposes!

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