G++ defines _GNU_SOURCE, implies C99

[Gabriel Dos Reis]

Phil Edwards <phil@jaj.com> writes:

| The "bug" (design flaw, more precisely) is that the C++ headers need some
| rewriting to make these macros unneeded, but for all the bitching and
| moaning over the effects of this misdesign, nobody has yet contributed
| the time to do so.

FYI, Benjamin, Ulrich and I are working to make "C" headers work
properly on Glibc systems.  I think Glibc-2.3 already has the
necessary bits in.  Benjamin ?

-- Gaby