[Libexif-devel] Re: libexif library soname change

[Lutz <lu...@us...>]

On Fri, 2005-04-15 at 19:28 +0200, Hongli Lai wrote:
> Hi. I'm building an autopackage[1] for Gimp, and I came across a problem 
> with libexif: the library major has changed compared to the one shipped 
> with slightly older distributions, such as Fedora Core 1. This means 
> that libexif broke compatibility.

or that no-one has educated libexif developers (specifically me)
sufficiently on how to correctly set up and maintain
libexif/configure.in.

My goal up to now was to make sure that we don't release different
incompatible versions of libexif with the same major version. It seems
that I've fully reached that goal :-)

If I remember correctly, the last change breaking binary compatibility
happened in July 2002. After that, we only added interfaces and fixed
the code behind the existing API. 

There is some logic and documentation in libexif/configure.in that is
probably incorrect or (at least) not clear enough. Up to now, if I added
an interface, I just increased 'CURRENT'. See code snippet below. Could
you send us a patch?

Thanks a lot!

Regards

Lutz


dnl
---------------------------------------------------------------------------
dnl Versioning:
dnl  - AGE (Micro):      Increment if any interfaces have been added;
set to 0
dnl                      if any interfaces have been removed. Removal
has
dnl                      precedence over adding, so set to 0 if both
happened.
dnl  - REVISION (Minor): Increment any time the source changes; set to
dnl                      0 if you incremented CURRENT.
dnl  - CURRENT (Major):  Increment if the interface has additions,
changes,
dnl                      removals.
dnl
---------------------------------------------------------------------------
LIBEXIF_AGE=0
LIBEXIF_REVISION=0
LIBEXIF_CURRENT=12
AC_SUBST([LIBEXIF_AGE])
AC_SUBST([LIBEXIF_REVISION])
AC_SUBST([LIBEXIF_CURRENT])
LIBEXIF_VERSION_INFO=`expr $LIBEXIF_CURRENT + $LIBEXIF_REVISION`:
$LIBEXIF_AGE:$LIBEXIF_REVISION
AC_SUBST([LIBEXIF_VERSION_INFO])