Re: Bootstrap failure (Re: [Patch] Java: Prepare for %q, %< and %>in diagnostic messages)

[Paolo Bonzini <paolo dot bonzini at polimi dot it>]

> > I wonder if it is it legal to declare a va_list which is an array, and 
> > even if it is, why not changing it to an array-within-a-struct.
>
> That would change the ABI.
>
> If you pass va_list by value to say vprintf and the arch in question
> doesn't pass structures by reference, it is different if va_list
> is an array (in which case you pass its address) or if it is a structure
> with array inside (in that case you pass the structure).

Sorry, I omitted an important detail: according to s390.c, "the 
specifies that only structures of size 1, 2, 4, or 8 bytes are passed by 
value, all other structures (and complex numbers) are passed by 
reference".  The same in rs6000.c, where it says that "aggregates and 
long double are passed by reference".

Paolo