Systemlib: Add FW and OS versioning

cmake/common/px4_base.cmake

@@ -765,6 +765,13 @@ function(px4_create_git_hash_header)
 		ONE_VALUE HEADER
 		REQUIRED HEADER
 		ARGN ${ARGN})
+	execute_process(
+		COMMAND git describe --tags
+		OUTPUT_VARIABLE git_tag
+		OUTPUT_STRIP_TRAILING_WHITESPACE
+		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+		)
+	message(STATUS "GIT_TAG = ${git_tag}")
 	execute_process(
 		COMMAND git rev-parse HEAD
 		OUTPUT_VARIABLE git_desc

cmake/templates/build_git_version.h.in

@@ -2,3 +2,4 @@
 /* Do not edit! */
 #define PX4_GIT_VERSION_STR  "@git_desc@"
 #define PX4_GIT_VERSION_BINARY 0x@git_desc_short@
+#define PX4_GIT_TAG_STR  "@git_tag@"