install libosmo-pfcp

The first user of this is osmo-hnbgw, to implement GTP mapping via a
UPF.

Related: SYS#5895
Change-Id: If4465095000a898296d69d5b725507f909c87aa3

Makefile.am

@@ -19,6 +19,7 @@ SUBDIRS = \
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = \
 	libosmo-gtlv.pc \
+	libosmo-pfcp.pc \
 	$(NULL)
 
 BUILT_SOURCES = $(top_srcdir)/.version

configure.ac

@@ -86,6 +86,7 @@ AM_CONFIG_HEADER(config.h)
 
 AC_OUTPUT(
     libosmo-gtlv.pc
+    libosmo-pfcp.pc
     include/Makefile
     include/osmocom/Makefile
     include/osmocom/gtlv/Makefile

libosmo-pfcp.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: Osmocom PFCP library
+Description: C Utility Library that implements the PFCP protocol and endpoint
+Version: @VERSION@
+Libs: -L${libdir} -losmo-pfcp
+Cflags: -I${includedir}/

src/libosmo-pfcp/Makefile.am

@@ -19,11 +19,11 @@ AM_LDFLAGS = \
 	$(COVERAGE_LDFLAGS) \
 	$(NULL)
 
-noinst_LIBRARIES = \
-	libosmo-pfcp.a \
+lib_LTLIBRARIES = \
+	libosmo-pfcp.la \
 	$(NULL)
 
-libosmo_pfcp_a_SOURCES = \
+libosmo_pfcp_la_SOURCES = \
 	pfcp_endpoint.c \
 	pfcp_ies_custom.c \
 	pfcp_msg.c \
@@ -32,6 +32,13 @@ libosmo_pfcp_a_SOURCES = \
 	pfcp_ies_auto.c \
 	$(NULL)
 
+# This is _NOT_ the library release version, it's an API version.
+# Please read Chapter 6 "Library interface versions" of the libtool
+# documentation before making any modification
+LIBVERSION=1:0:0
+
+libosmo_pfcp_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined -export-symbols-regex '^osmo_'
+
 BUILT_SOURCES = \
 	pfcp_ies_auto.c \
 	$(NULL)

tests/libosmo-pfcp/Makefile.am

@@ -22,9 +22,9 @@ pfcp_test_SOURCES = \
 	$(NULL)
 
 pfcp_test_LDADD = \
-	$(top_builddir)/src/libosmo-pfcp/libosmo-pfcp.a \
-	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.la \
 	$(LIBOSMOCORE_LIBS) \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.la \
+	$(top_builddir)/src/libosmo-pfcp/libosmo-pfcp.la \
 	$(NULL)
 
 .PHONY: update_exp