[gtksourceview] Add Libtool versioning

[Sébastien Wilmet <swilmet src gnome org>]

commit 0dc5025bba7f6e423e58ce172a4336ef35a21c65
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Mar 22 22:26:47 2013 +0100

    Add Libtool versioning
    
    There was an ABI break during this cycle, to the algorithm has been
    applied accordingly (from 0:0:0, since no libtool versioning was used
    before).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=477709

 configure.ac              |   29 ++++++++++++++++++++++++++++-
 gtksourceview/Makefile.am |    1 +
 2 files changed, 29 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c92380b..0a3e5b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,34 @@ m4_define(gtksourceview_minor_version, 7)
 m4_define(gtksourceview_micro_version, 93)
 m4_define(gtksourceview_version, 
gtksourceview_major_version.gtksourceview_minor_version.gtksourceview_micro_version)
 
-AC_INIT([gtksourceview],[gtksourceview_version],[http://bugzilla.gnome.org/enter_bug.cgi?product=gtksourceview],[gtksourceview],[http://projects.gnome.org/gtksourceview/])
+AC_INIT([gtksourceview],
+        [gtksourceview_version],
+       [http://bugzilla.gnome.org/enter_bug.cgi?product=gtksourceview],
+       [gtksourceview],
+       [http://projects.gnome.org/gtksourceview/])
+
+# Libtool versioning
+#
+# For development releases, keep the same numbers.
+#
+# For stable releases, apply the following algorithm step by step:
+# 1. If the library source code has changed at all since the last
+#    update, then increment REVISION.
+# 2. If any exported functions or data have been added, removed, or
+#    changed since the last update, increment CURRENT and set REVISION
+#    to 0.
+# 3. If any exported functions or data have been added since the last
+#    public release, increment AGE.
+# 4. If any exported functions or data have been removed since the last
+#    public release, set AGE to 0.
+#
+# (From the book Autotools, by John Calcote)
+
+GSV_LT_CURRENT=1
+GSV_LT_REVISION=0
+GSV_LT_AGE=0
+GSV_LT_VERSION="$GSV_LT_CURRENT:$GSV_LT_REVISION:$GSV_LT_AGE"
+AC_SUBST(GSV_LT_VERSION)
 
 AC_CONFIG_SRCDIR([gtksourceview/gtksourcebuffer.h])
 AC_CONFIG_HEADER([config.h])
diff --git a/gtksourceview/Makefile.am b/gtksourceview/Makefile.am
index ef5280a..ea451b6 100644
--- a/gtksourceview/Makefile.am
+++ b/gtksourceview/Makefile.am
@@ -138,6 +138,7 @@ libgtksourceview_3_0_la_CFLAGS =    \
        $(CODE_COVERAGE_CFLAGS)
 
 libgtksourceview_3_0_la_LDFLAGS =              \
+       -version-info $(GSV_LT_VERSION)         \
        -no-undefined                           \
        -export-symbols-regex "^gtk_source_.*"  \
        $(CODE_COVERAGE_LDFLAGS)