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Improve/fix libtool library versioning #34

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Improve/fix libtool library versioning #34

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23 changes: 22 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -218,7 +218,28 @@ else
SVN_APR_MAJOR_VERSION=1
fi
AC_SUBST(SVN_APR_MAJOR_VERSION)
SVN_LT_SOVERSION="-version-info $svn_lib_ver"

# For libtool library versioning, follow the interface rules at:
# https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html
# for SVN <major>.<minor>.<patch>:
#
# 1. the oldest version supported is always 0 (or 2 for the above APR2
# variant), corresponding to the ABI at <major>.0.0; changes to
# <major> are reflected in the library names like "libsvn_subr-1.la"
#
# 2. the current version and age of the ABI both equal <minor>, since
# SVN minor versions always maintain backwards-compatibility to
# <major>.0; in the APR2 variant, the current version is 2+<minor>.
#
# 3. the revision is equal to the <patch> number.

m4_define([svn_ver_major], m4_bpatsubst(AC_PACKAGE_VERSION, [\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)], [\1]))
m4_define([svn_ver_minor], m4_bpatsubst(AC_PACKAGE_VERSION, [\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)], [\2]))
m4_define([svn_ver_patch], m4_bpatsubst(AC_PACKAGE_VERSION, [\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)], [\3]))
svn_ver_current="`expr $svn_lib_ver + svn_ver_minor`"

SVN_LT_SOVERSION="-version-info $svn_ver_current:svn_ver_patch:svn_ver_minor"

AC_SUBST(SVN_LT_SOVERSION)
AC_DEFINE_UNQUOTED(SVN_SOVERSION, $svn_lib_ver,
[Subversion library major version])
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