cpplib: Dump __GXX_WEAK__ and __STDC__ with -dM

[Kaveh R. Ghazi]

 > From: Rainer Orth <ro@TechFak.Uni-Bielefeld.DE>
 > 
 > > IIRC, STDC_0_IN_SYSTEM_HEADERS was introduced to address a specific
 > > problem, namely that we *don't* want fixincludes to diddle every
 > > header file on solaris2.  There are numerous reasons to want to lower
 > > the number of files gratuitously changed, I won't rehash them here.
 > 
 > But this is not what happens at the moment: we both run fixincludes to fix
 > that __STDC__-0==0 stuff and still have STDC_0_IN_SYSTEM_HEADERS, which
 > won't trigger any longer since we have fixed copies of all affected system
 > headers anyway.  This is a change from gcc 2.95.2 where fixincludes wasn't
 > run on Solaris 2.5 and up and thus STDC_0_IN_SYSTEM_HEADERS was necessary
 > for gcc to work with the unchanged vendor headers; I haven't check when
 > this was introduced.
 > 	Rainer

Ah I see, well then that's a bug.  We should restore the bypass for
solaris in fixincludes so that it doesn't bother "fixing" the
__STDC__-0==0, stuff.

Care to supply a patch?

--
Kaveh R. Ghazi			Engagement Manager / Project Services
ghazi@caip.rutgers.edu		Qwest Internet Solutions