Switch to libtool versioning system

It has been a request that multiple libnl versions should be installabe
in parallel.

In order to achieve this, the basename of the library was changed to
libnl-3 which reflects the 3rd generation of libnl APIs. It also means
that release based library versioning is left behind and libtool
versioning is used instead.

Projects using pkgconfig will automatically link against the new library
basename and will not notice a difference.

The SO versioning is based on the glib model:
  current := 100 * minor + micro - revision
  revision := revision
  age := age (number of backwards compatible versions)

10 files changed, 131 insertions, 55 deletions

diff --git a/Makefile.am b/Makefile.am
index 6706e4b..a936c49 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,10 +10,10 @@ endif
 
 SUBDIRS = include lib doc man python $(OPT_DIRS)
 
-pkgconfig_DATA = libnl-3.pc \
-		 libnl-route-3.pc \
-		 libnl-genl-3.pc \
-		 libnl-nf-3.pc
+pkgconfig_DATA = libnl-3.0.pc \
+		 libnl-route-3.0.pc \
+		 libnl-genl-3.0.pc \
+		 libnl-nf-3.0.pc
 
 pkgsysconfdir = ${sysconfdir}/libnl
 pkgsysconf_DATA = etc/pktloc etc/classid
diff --git a/configure.in b/configure.in
index 2ee35c3..b1b4f11 100644
--- a/configure.in
+++ b/configure.in
@@ -9,16 +9,43 @@
 # Copyright (c) 2003-2011 Thomas Graf <tgraf@suug.ch>
 #
 
-AC_INIT(libnl, 3.2, tgraf@suug.ch)
+
+# copied from glib
+m4_define([libnl_major_version], [3])
+m4_define([libnl_minor_version], [2])
+m4_define([libnl_micro_version], [0]) # bump for every release unless minor was bumped
+m4_define([libnl_lt_revision],	 [0]) # bump or reset to 0 if interfaces were added
+m4_define([libnl_lt_age],	 [0]) # bump whenever a release is backwards compatible
+                                      # bump with +100 if a minor release is compatible
+				      # reset to 0 if interfaces were removed
+
+m4_define([libnl_version],
+	  [libnl_major_version.libnl_minor_version.libnl_micro_version])
+
+m4_define([libnl_lt_current],
+	  [m4_eval(100 * libnl_minor_version + libnl_micro_version - libnl_lt_revision)])
+
+AC_INIT(libnl, [libnl_version], [http://www.infradead.org/~tgr/libnl/])
 AC_CONFIG_HEADERS([lib/defs.h])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([-Wall foreign subdir-objects])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)], [])
 
-MAJ_VERSION=3
-AC_SUBST([MAJ_VERSION])
-MIN_VERSION=2
-AC_SUBST([MIN_VERSION])
+MAJ_VERSION=libnl_major_version
+AC_SUBST(MAJ_VERSION)
+MIN_VERSION=libnl_minor_version
+AC_SUBST(MIN_VERSION)
+MIC_VERSION=libnl_micro_version
+AC_SUBST(MIC_VERSION)
+LIBNL_VERSION=libnl_version
+AC_SUBST(LIBNL_VERSION)
+
+LT_CURRENT=libnl_lt_current
+AC_SUBST(LT_CURRENT)
+LT_REVISION=libnl_lt_revision
+AC_SUBST(LT_REVISION)
+LT_AGE=libnl_lt_age
+AC_SUBST(LT_AGE)
 
 AC_PROG_CC
 AM_PROG_CC_C_O
@@ -43,25 +70,39 @@ AM_CONDITIONAL([ENABLE_CLI], [test "$enable_cli" = "yes"])
 AC_CHECK_LIB([m], [pow], [], AC_MSG_ERROR([libm is required]))
 AC_CHECK_LIB([pthread], [pthread_mutex_lock], [], AC_MSG_ERROR([libpthread is required]))
 
-AC_CONFIG_FILES([Makefile doc/Doxyfile doc/Makefile lib/Makefile
-	include/Makefile src/Makefile src/lib/Makefile man/Makefile
-	libnl-3.pc libnl-route-3.pc libnl-genl-3.pc libnl-nf-3.pc
-	python/Makefile python/setup.py python/netlink/Makefile
-	python/netlink/route/Makefile
-	include/netlink/version.h])
+AC_CONFIG_FILES([
+Makefile
+libnl-3.0.pc
+libnl-route-3.0.pc
+libnl-genl-3.0.pc
+libnl-nf-3.0.pc
+doc/Doxyfile
+doc/Makefile
+lib/Makefile
+include/Makefile
+src/Makefile
+src/lib/Makefile
+man/Makefile
+python/Makefile
+python/setup.py
+python/netlink/Makefile
+python/netlink/route/Makefile
+include/netlink/version.h
+])
+
 AC_OUTPUT
 
-echo -------------------------------------------------------------------------------
-echo                                   NOTE
-echo 
-echo  Headers will be installed in ${includedir}/libnl${MAJ_VERSION} starting with
-echo  version 3.2. If you are using pkg-config things should continue to work as
-echo  expected, otherwise you will have to extend the CLFAGS of your project with
-echo
-echo              -I${includedir}/libnl${MAJ_VERSION}
-echo
-echo  Also, pkg-config files for sub libraries have been added, so you can
-echo  verify their presence
-echo
-echo -------------------------------------------------------------------------------
+echo "-------------------------------------------------------------------------------"
+echo "                                  NOTE"
+echo ""
+echo " Headers will be installed in ${includedir}/libnl${MAJ_VERSION} starting with"
+echo " version 3.2. If you are using pkg-config things should continue to work as"
+echo " expected, otherwise you will have to extend the CLFAGS of your project with"
+echo ""
+echo "             -I${includedir}/libnl${MAJ_VERSION}"
+echo ""
+echo " Also, pkg-config files for sub libraries have been added, so you can"
+echo " verify their presence"
+echo ""
+echo "-------------------------------------------------------------------------------"
 
diff --git a/doc/core.txt b/doc/core.txt
index 796e9fc..c10cbc0 100644
--- a/doc/core.txt
+++ b/doc/core.txt
@@ -7,7 +7,7 @@
 Netlink Library (libnl)
 =======================
 Thomas Graf <tgraf@suug.ch>
-3.1, Aug 11 2011:
+3.2, Sep 13 2011:
 :numbered:
 
 == Introduction
@@ -59,6 +59,25 @@ The low level APIs are described in:
 
 === Linking to this Library
 
+.Checking the presence using autoconf
+
+Projects using autoconf may use +PKG_CHECK_MODULES()+ to check if
+a specific version of libnl is available on the system. The example
+below also shows how to retrieve the +CFLAGS+ and linking dependencies
+required to link against the library.
+
+[source]
+----
+PKG_CHECK_MODULES(LIBNL3, libnl-3.0 >= 3.1, [have_libnl3=yes], [have_libnl3=no])
+if (test "${have_libnl3}" = "yes"); then
+	CFLAGS += "$LIBNL3_CFLAGS"
+	LIBS += "$LIBNL3_LIBS"
+fi
+----
+
+NOTE: The pkgconfig file is named +libnl-3.0.pc+ for historic reasons, it also
+      covers library versions >= 3.1.
+
 .Main Header
 
 The main header is `<netlink/netlink.h>`. Additional headers need to
@@ -77,7 +96,7 @@ makes use of.
 
 .Linking to libnl
 -----
-$ gcc myprogram.c -o myprogram -lnl
+$ gcc myprogram.c -o myprogram $(pkgconfig --cflags --libs libnl-3.0)
 -----
 
 === Debugging
diff --git a/include/netlink/version.h.in b/include/netlink/version.h.in
index 9deb365..4d32dad 100644
--- a/include/netlink/version.h.in
+++ b/include/netlink/version.h.in
@@ -20,4 +20,8 @@
 #define LIBNL_VER(maj,min)	((maj) << 8 | (min))
 #define LIBNL_VER_NUM		LIBNL_VER(LIBNL_VER_MAJ, LIBNL_VER_MIN)
 
+#define LIBNL_CURRENT		@LT_CURRENT@
+#define LIBNL_REVISION		@LT_REVISION@
+#define LIBNL_AGE		@LT_AGE@
+
 #endif
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 90c98e9..da2dbf6 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,21 +1,30 @@
 # -*- Makefile -*-
 
-AM_CPPFLAGS  = -Wall -I${top_srcdir}/include -I${top_builddir}/include -I${builddir}/route -I${builddir}/route/cls -D_GNU_SOURCE -DSYSCONFDIR=\"$(sysconfdir)/libnl\"
-AM_LDFLAGS = -version-info @MAJ_VERSION@:@MIN_VERSION@:0
+AM_CPPFLAGS  =			 	\
+	-Wall \
+	-I${top_srcdir}/include \
+	-I${top_builddir}/include \
+	-I${builddir}/route \
+	-I${builddir}/route/cls \
+	-D_GNU_SOURCE \
+	-DSYSCONFDIR=\"$(sysconfdir)/libnl\"
+
+AM_LDFLAGS = \
+	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
 
 lib_LTLIBRARIES = \
-	libnl.la libnl-genl.la libnl-route.la libnl-nf.la
+	libnl-3.la libnl-genl-3.la libnl-route-3.la libnl-nf-3.la
 
-libnl_la_SOURCES = \
+libnl_3_la_SOURCES = \
 	addr.c attr.c cache.c cache_mngr.c cache_mngt.c data.c \
 	error.c handlers.c msg.c nl.c object.c socket.c utils.c
 
-libnl_genl_la_LIBADD  = libnl.la
-libnl_genl_la_SOURCES = \
+libnl_genl_3_la_LIBADD  = libnl-3.la
+libnl_genl_3_la_SOURCES = \
 	genl/ctrl.c genl/family.c genl/genl.c genl/mngt.c
 
-libnl_nf_la_LIBADD  = libnl-route.la
-libnl_nf_la_SOURCES = \
+libnl_nf_3_la_LIBADD  = libnl-route-3.la
+libnl_nf_3_la_SOURCES = \
 	netfilter/ct.c netfilter/ct_obj.c netfilter/log.c \
 	netfilter/log_msg.c netfilter/log_msg_obj.c netfilter/log_obj.c \
 	netfilter/netfilter.c netfilter/nfnl.c netfilter/queue.c \
@@ -41,8 +50,8 @@ route/cls/ematch_grammar.c: route/cls/ematch_grammar.l
 route/cls/ematch_syntax.c: route/cls/ematch_syntax.y
 	$(AM_V_GEN) $(YACC) -d $(YFLAGS) -o $@ $^
 
-libnl_route_la_LIBADD  = libnl.la
-libnl_route_la_SOURCES = \
+libnl_route_3_la_LIBADD  = libnl-3.la
+libnl_route_3_la_SOURCES = \
 	route/addr.c route/class.c route/cls.c route/link.c \
 	route/neigh.c route/neightbl.c route/nexthop.c route/qdisc.c \
 	route/route.c route/route_obj.c route/route_utils.c route/rtnl.c \
@@ -69,7 +78,7 @@ libnl_route_la_SOURCES = \
 	\
 	route/pktloc.c
 
-nodist_libnl_route_la_SOURCES = \
+nodist_libnl_route_3_la_SOURCES = \
 	route/pktloc_syntax.c route/pktloc_syntax.h \
 	route/pktloc_grammar.c route/pktloc_grammar.h \
 	route/cls/ematch_syntax.c route/cls/ematch_syntax.h \
diff --git a/libnl-3.pc.in b/libnl-3.0.pc.in
index 05a06fc..b87e3dc 100644
--- a/libnl-3.pc.in
+++ b/libnl-3.0.pc.in
@@ -6,5 +6,5 @@ includedir=@includedir@
 Name: libnl
 Description: Convenience library for netlink sockets
 Version: @PACKAGE_VERSION@
-Libs: -L${libdir} -lnl
+Libs: -L${libdir} -lnl-@MAJ_VERSION@
 Cflags: -I${includedir}/libnl@MAJ_VERSION@
diff --git a/libnl-genl-3.pc.in b/libnl-genl-3.0.pc.in
index e9cbe62..d6b69b8 100644
--- a/libnl-genl-3.pc.in
+++ b/libnl-genl-3.0.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libnl-genl
 Description: Generic Netlink Library
 Version: @PACKAGE_VERSION@
-Requires: libnl-3
-Libs: -L${libdir} -lnl-genl
+Requires: libnl-3.0
+Libs: -L${libdir} -lnl-genl-@MAJ_VERSION@
 Cflags: -I${includedir}/libnl@MAJ_VERSION@
diff --git a/libnl-nf-3.pc.in b/libnl-nf-3.0.pc.in
index b45eb51..d82e1a6 100644
--- a/libnl-nf-3.pc.in
+++ b/libnl-nf-3.0.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libnl-nf
 Description: Netfilter Netlink Library
 Version: @PACKAGE_VERSION@
-Requires: libnl-3
-Libs: -L${libdir} -lnl-nf
+Requires: libnl-route-3.0
+Libs: -L${libdir} -lnl-nf-@MAJ_VERSION@
 Cflags: -I${includedir}/libnl@MAJ_VERSION@
diff --git a/libnl-route-3.pc.in b/libnl-route-3.0.pc.in
index 4988616..372a4f4 100644
--- a/libnl-route-3.pc.in
+++ b/libnl-route-3.0.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libnl-route
 Description: Netlink Routing Family Library
 Version: @PACKAGE_VERSION@
-Requires: libnl-3
-Libs: -L${libdir} -lnl-route
+Requires: libnl-3.0
+Libs: -L${libdir} -lnl-route-@MAJ_VERSION@
 Cflags: -I${includedir}/libnl@MAJ_VERSION@
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 3236dbe..a88163a 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -1,7 +1,10 @@
 # -*- Makefile -*-
 
 AM_CPPFLAGS  = -Wall -I${top_srcdir}/include -I${top_builddir}/include -D_GNU_SOURCE -DPKGLIBDIR=\"$(pkglibdir)\" -DSYSCONFDIR=\"$(sysconfdir)\" -rdynamic
-AM_LDFLAGS = -L${top_builddir}/lib -ldl -version-info 3:0:0
+AM_LDFLAGS = \
+	-L${top_builddir}/lib \
+	-ldl \
+	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
 
 #nobase_pkglib_LTLIBRARIES = cls/basic.la cls/ematch/cmp.la
 #cls_basic_la_LDFLAGS = -module -version-info 2:0:0
@@ -26,14 +29,14 @@ AM_LDFLAGS = -L${top_builddir}/lib -ldl -version-info 3:0:0
 #	cls/pktloc_syntax.c cls/pktloc_syntax.h
 
 lib_LTLIBRARIES = \
-	libnl-cli.la
+	libnl-cli-3.la
 
-libnl_cli_la_LIBADD  = ${top_builddir}/lib/libnl.la \
-		       ${top_builddir}/lib/libnl-route.la \
-		       ${top_builddir}/lib/libnl-nf.la \
-		       ${top_builddir}/lib/libnl-genl.la
+libnl_cli_3_la_LIBADD  = ${top_builddir}/lib/libnl-3.la \
+		       ${top_builddir}/lib/libnl-route-3.la \
+		       ${top_builddir}/lib/libnl-nf-3.la \
+		       ${top_builddir}/lib/libnl-genl-3.la
 
-libnl_cli_la_SOURCES = \
+libnl_cli_3_la_SOURCES = \
 	utils.c addr.c ct.c link.c neigh.c rule.c route.c \
 	tc.c qdisc.c class.c cls.c
 #	cls/ematch_syntax.c cls/ematch_grammar.c cls/ematch.c