_G_USING_THUNKS + Sparc

[Jason Merrill]

>>>>> "Mark" == Mark Mitchell <mark@codesourcery.com> writes:

> --On Monday, April 22, 2002 11:59:24 PM -0700 "David S. Miller"
> <davem@redhat.com> wrote:

>> Why do we set this to zero on Solaris systems?

> We don't do the bit where libio's idea of a stream and the V3 idea
> are the same object anymore -- that hack doesn't work with the new
> C++ ABI.  (It is difficult, even in principle, to make it work with
> the new ABI, but it is theoretically possible.  Nobody has implemented
> it, though...)

Would it be that difficult?  The streambufs only use single inheritance, so
I wouldn't expect the vtables to be any more complicated than in v2.
AFAIK, the main reason for separating the implementation was to avoid the
glibc/libstdc++ version lock problems we had in v2.

None of which is relevant to Solaris, of course.  Nowadays, _G_USING_THUNKS
is meaningless; there's no reason for any of the config headers to set it.

Jason