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Toplevel configury, multilibs, new autoconf versions

The next step in converting to the new autotools is making multilibs work.
I'm using the versions of the files that I put up for testing last night
(see the v3 list).  And I've temporarily turned i686-linux into a multilib
target using some harmless option (one of the -f optimizations), just
there to trigger the multilib build mechanisms.

The build is using the value of CXX passed around in the environment.
For libstdc++, it's a special case from the toplevel:

    libstdcxx_flags='`test ! -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags || $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes` -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs'
    raw_libstdcxx_flags=' -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs'

Note the -L options; these get embedded into CXX_FOR_TARGET a few lines
later, which becomes CXX inside the library.

(Why does libstdc++ care about -L options?  Because we actually do link
at least one executable during the normal build, to say nothing of the

Nothing anywhere adjusts the value of CXX's -L flags to search the multilib
dirs instead of the primary dir.  For a real multilib target, this means
that the program gets compiled with one option, but linked against the
standard primary library.  (For my fake i686 multilibs, this would have
succeeded, but the multilibs look to be built bottom up, so the primary hadn't been built yet when the multilib's executable tried
to search that directory, and the link failed.)

Ideas are solicited.  What we need to do seems clear, but I could use some
help deciding how to go about doing it.


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