Re: [sdcc-devel] printf varargs and issues......again

[Johan K. <joh...@id...>]

> >Michael's bug report pointed me (again) at the printf and stdarg issue.
> >It's still (again?) a mess.
> Still :-( The compiler crash is one of the first bugs I reported.

Yes, I remember, in fact it is still in my "todo-box":

jk>>You are right. The precompiler changes "p = va_arg( argptr, char * );"
to
jk>>"*((char * _data * )(argptr -= sizeof(char *)))", which is nonsense.
jk>
bh>Hmm. I can´t see why it should be nonsense. I think it´s ok. But this
does not mean too much :-)

>  I stripped it down to:
...
> Or even shorter:
...
>

Or even shorter:

char *nonsense( void )
{
  return *(char * _data *)0;
}

I think this means that the literal "0" is casted to a generic pointer in
data space, whose content is returned. I don't know whether the address in
data space or the generic point should be "0" in this case. Neither does the
compiler it seems because it crashes. When making this case less ambigious
with "return *(char _generic * _data *)0", the compiler returns the generic
pointer located in data space @0. This has the same effect as in MH's bug
report. I couldn't find the solution and won't look any further. Sorry.

Johan