libstdcxx_incdir passed down from top-level Makefile?

[Alexandre Oliva]

I don't see the point of passing it down from the top-level Makefile.
It's not set in there.  In fact, it's not set in that Makefile, even
though gxx_include_dir ends up referencing it, and gxx_include_dir
*is* passed down.  I don't see how this can work.

Should we stop passing these variables down or arranging for
libstdcxx_incdir to be set in the top-level Makefile?

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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