version and release number

[Lorenzo Bettini]

Hi

I've just started using libtool and in the manual you read:

Never try to set the interface numbers so that they correspond to the 
release number of your package. This is an abuse that only fosters 
misunderstanding of the purpose of library versions. Instead, use the 
-release flag (see Release numbers), but be warned that every release of 
your package will not be binary compatible with any other release.

what I don't understand is the "not binary compatible": if I use, say 
1.0 for the release flag (and the version number correctly as stated in 
the manual), and release another implementation of the library with the 
incremented version number but with the same release number, why won't 
it be binary compatible?

Or does "not binary compatible" apply only if I increment also the 
release number?

Is it better to use only version number?

thanks in advance
        Lorenzo

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Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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