Another problem with new varargs code

[Jeffrey A Law]

We have some systems (such as irix6.5) where we do only minimal fixing of
the system header files.

Most notably we do not munge stdio.h

Unfortunately, stdio.h has something like this:

/* Define the va_list type: */
#ifndef _VA_LIST_
#define _VA_LIST_
typedef char *va_list;
#endif /* !_VA_LIST_ */

Which prevents us from installing our own typedef for va_list in varargs.h or
stdarg.h.

Not surprisingly this causes some unpleasant problems when we call
__builtin_stdarg_start and similar functions with a variable of type va_list.

You can see this behavior first hand compiling 920726-1.c on an irix6.5
machine (holodeck:/work/law/egcs/gcc if you want a pre-built tree to poke at).

Presumably this means we're going to have to fix stdio.h on these systems to
avoid losing.



jeff