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(libtool.info)Updating version info

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Updating library version information
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   If you want to use libtool's versioning system, then you must specify
the version information to libtool using the `-version-info' flag
during link mode (Note: Link mode).

   This flag accepts an argument of the form
`CURRENT[:REVISION[:AGE]]'.  So, passing `-version-info 3:12:1' sets
CURRENT to 3, REVISION to 12, and AGE to 1.

   If either REVISION or AGE are omitted, they default to 0.  Also note
that AGE must be less than or equal to the CURRENT interface number.

   Here are a set of rules to help you update your library version
information:

  1. Start with version information of `0:0:0' for each libtool library.

  2. Update the version information only immediately before a public
     release of your software.  More frequent updates are unnecessary,
     and only guarantee that the current interface number gets larger
     faster.

  3. If the library source code has changed at all since the last
     update, then increment REVISION (`C:R:A' becomes `C:r+1:A').

  4. If any interfaces have been added, removed, or changed since the
     last update, increment CURRENT, and set REVISION to 0.

  5. If any interfaces have been added since the last public release,
     then increment AGE.

  6. If any interfaces have been removed since the last public release,
     then set AGE to 0.

   *_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 (Note: Release numbers), but be warned that
every release of your package will not be binary compatible with any
other release.