cpp oddities. was: sparc-sun-solaris2.8 headers: fixinc, cpplib

[Joe Buck]

I wrote:

> > While this is a good thing for end users, it may also tend to degrade
> > the quality of the libraries we supply if we are not careful.  In
> > particular, libstdc++ headers should be as warning-free as they can be
> > made without resort to such measures....

Neil writes:
> True.  However, like say glibc, would this not be noticed during
> development compiles, when they aren't installed as system headers?

Maybe.  What is the algorithm for deciding which headers are system headers?