Interface range compatibility?

[Phillip Susi]

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If I build rev 0 of a library, link to it, then rebuild the library
with interface 1, age 1, that should mean it is compatible with
interface 0 or 1.  It creates libfoo.so.0.1.0 so an app linked against
interface 0 will find it.  Now if I rebuild the app against this
library, I would expect it to prefer interface 1 and there to be a
libfoo.so.1.0.0 symlink it would request, but there isn't.  Therefore,
when I decide to drop support for the old interface 0 from the library
by dropping the age to 0, the app no longer can find the library,
which is now libfoo.so.1.0.0.

What am I missing here?  How do you get the app to prefer the newer
interface ( and thus, work when the old interface is dropped ) while
allowing older apps to use the old interface for a while?

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