add proper versioning

We prefer version 3, as r2pX is pretty rare by now, but if needs be,
this can be easily changed.
Signed-off-by: Luc Verhaegen <libv@skynet.be>

configure.ac

@@ -8,6 +8,9 @@ AM_MAINTAINER_MODE
 
 LT_INIT
 
+LIBUMP_VERSION_MAJOR=3
+AC_SUBST([LIBUMP_VERSION_MAJOR])
+
 # Support silent build rules, requires at least automake-1.11. Disable
 # by either passing --disable-silent-rules to configure or passing V=1
 # to make
@@ -37,6 +40,7 @@ AC_CHECK_LIB([pthread],[pthread_mutex_lock],[],[])
 AC_CONFIG_FILES([
 	Makefile
 	src/Makefile
+	src/ump.h
 ])
 
 AC_OUTPUT

src/Makefile.am

 lib_LTLIBRARIES = libUMP.la
+libUMP_la_LDFLAGS = -version-info @LIBUMP_VERSION_MAJOR@
 libUMP_la_LIBADD = @LIBS@
 libUMP_la_SOURCES = \
 	ump_arch.c \

src/ump.h → src/ump.h.in

@@ -23,6 +23,7 @@
 #ifndef _UNIFIED_MEMORY_PROVIDER_H_
 #define _UNIFIED_MEMORY_PROVIDER_H_
 
+#define UNIFIED_MEMORY_PROVIDER_VERSION @LIBUMP_VERSION_MAJOR@
 
 /** @defgroup ump_user_space_api UMP User Space API
  * @{ */