Generate a version.h file

Related: OS#6626
Change-Id: If3972eb4e56073f8faf58b09d014a811d4a5f401

.gitignore

@@ -86,3 +86,5 @@ contrib/osmo-ggsn.spec
 /debian/gtp-echo-responder/
 /debian/osmo-ggsn-doc/
 /utils/gtp-echo-responder
+
+include/osmocom/gtp/version.h

include/osmocom/gtp/Makefile.am

@@ -1,8 +1,22 @@
+version.h: version.h.tpl
+	$(AM_V_GEN)$(MKDIR_P) $(dir $@)
+	$(AM_V_GEN)sed \
+		-e "s/{{VERSION}}/$$(echo '@VERSION@' | cut -d. -f1-3)/g" \
+		-e "s/{{VERSION_MAJOR}}/$$(echo '@VERSION@' | cut -d. -f1)/g" \
+		-e "s/{{VERSION_MINOR}}/$$(echo '@VERSION@' | cut -d. -f2)/g" \
+		-e "s/{{VERSION_PATCH}}/$$(echo '@VERSION@' | cut -d. -f3)/g" \
+		$< > $@
+
+EXTRA_DIST = \
+	version.h.tpl \
+	$(NULL)
+
 libgtp_HEADERS = \
 	gsn.h \
 	gtp.h \
 	gtpie.h \
 	pdp.h \
+	version.h \
 	$(NULL)
 
 libgtpdir = $(includedir)/osmocom/gtp

include/osmocom/gtp/version.h.tpl

@@ -0,0 +1,16 @@
+#pragma once
+
+#define LIBGTP_VERSION {{VERSION}}
+#define LIBGTP_VERSION_STR "{{VERSION}}"
+
+#define LIBGTP_VERSION_MAJOR {{VERSION_MAJOR}}
+#define LIBGTP_VERSION_MINOR {{VERSION_MINOR}}
+#define LIBGTP_VERSION_PATCH {{VERSION_PATCH}}
+
+#define LIBGTP_VERSION_GREATER_EQUAL(major, minor, patch) \
+	(LIBGTP_VERSION_MAJOR > (major) || \
+	 (LIBGTP_VERSION_MAJOR == (major) && \
+	  LIBGTP_VERSION_MINOR > (minor)) || \
+	 (LIBGTP_VERSION_MAJOR == (major) && \
+	  LIBGTP_VERSION_MINOR == (minor) && \
+	  LIBGTP_VERSION_PATCH >= (patch)))