> The point of this problem is that the 2nd argument of iconv() is "a
> pointer of a pointer".  "char *" can be converted to "const char *"
> explicitly, but "char **" cannot be converted to "const char **"
> without warning.

Well, without a cast, yes.  I've never understood why char ** is
incompatible with const char **....

> Really, here is the sole portable way: ((size_t (*)())iconv)(cd, &src, ....); 

That's not all that portable, as it's calling a defined-as-prototyped
function with a non-prototyped calling sequence; I don't think that's
guaranteed to work.  I'd say a more portable way to write code is with
an explicit cast to (const char **) on the relevant argument.

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