abi/debian: Bump ABI version of libgtp after struct size change

The gsn_t changed the size with the addition of the ctrl pointer.
Bump the SO version to not break osmo-sgsn/ggsn on upgrade.

Call the -dev package libgtp-dev to follow the rest of Osmocom and
to ease making releases here.

Change-Id: Iac4d6d2effde1a6b2f60b1e1b49c91513d5ca8c3

debian/changelog

@@ -1,8 +1,9 @@
 openggsn (0.93) UNRELEASED; urgency=medium
 
   * Bump version to ease upgrading from Debian SID.
+  * Bump libgtp SO version after ABI change.
 
- -- Holger Hans Peter Freyther <holger@moiji-mobile.com>  Tue, 24 May 2016 22:53:16 +0200
+ -- Holger Hans Peter Freyther <holger@moiji-mobile.com>  Tue, 24 Jan 2017 17:26:26 +0100
 
 openggsn (0.92) precise; urgency=medium
 

debian/control

@@ -22,7 +22,7 @@ Description: Gateway GPRS Support Node (GGSN)
  operators as the interface between the Internet and the rest of the
  mobile network infrastructure.
 
-Package: libgtp0
+Package: libgtp1
 Architecture: any
 Multi-Arch: same
 Section: libs
@@ -36,12 +36,12 @@ Description: library implementing the GTP protocol between SGSN and GGSN
  This library is part of openggsn and implements the GTP protocol between
  SGSN (Serving GPRS support node) and GGSN.
 
-Package: libgtp0-dev
+Package: libgtp-dev
 Architecture: any
 Multi-Arch: same
 Section: libdevel
 Depends: ${misc:Depends},
-         libgtp0 (= ${binary:Version})
+         libgtp1 (= ${binary:Version})
 Description: Development files for libgtp
  OpenGGSN is a Gateway GPRS Support Node (GGSN). It is used by mobile
  operators as the interface between the Internet and the rest of the
@@ -54,6 +54,6 @@ Package: openggsn-dbg
 Section: debug
 Architecture: any
 Priority: extra
-Depends: ${shlibs:Depends}, ${misc:Depends}, libgtp0 (= ${binary:Version}), openggsn (= ${binary:Version})
+Depends: ${shlibs:Depends}, ${misc:Depends}, libgtp1 (= ${binary:Version}), openggsn (= ${binary:Version})
 Multi-Arch: same
 Description: Debug symbols for OpenGGSN

gtp/Makefile.am

@@ -1,3 +1,7 @@
+# This is _NOT_ the library release version, it's an API version.
+# Please read chapter "Library interface versions" of the libtool documentation
+# before making any modifications: https://www.gnu.org/software/libtool/manual/html_node/Versioning.html
+LIBVERSION=1:0:0
 lib_LTLIBRARIES = libgtp.la
 
 include_HEADERS = gtp.h pdp.h gtpie.h
@@ -5,6 +9,7 @@ include_HEADERS = gtp.h pdp.h gtpie.h
 AM_CFLAGS = -O2 -fno-builtin -Wall -DSBINDIR='"$(sbindir)"' -ggdb $(LIBOSMOCORE_CFLAGS)
 
 libgtp_la_SOURCES = gtp.c gtp.h gtpie.c gtpie.h pdp.c pdp.h lookupa.c lookupa.h queue.c queue.h
+libgtp_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
 libgtp_la_LIBADD = $(LIBOSMOCORE_LIBS)