build FEATURE new separate version header

Author: michalvasko

CMakeLists.txt

@@ -285,13 +285,15 @@ endif()
 configure_file("${PROJECT_SOURCE_DIR}/src/config.h.in" "${PROJECT_BINARY_DIR}/src/config.h" ESCAPE_QUOTES @ONLY)
 configure_file(nc_client.h.in nc_client.h)
 configure_file(nc_server.h.in nc_server.h)
+configure_file(nc_version.h.in nc_version.h)
 
 # install library
 install(TARGETS netconf2 DESTINATION ${CMAKE_INSTALL_LIBDIR})
 
 # install headers
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/nc_client.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/nc_server.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/nc_version.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 install(FILES ${headers} ${PROJECT_BINARY_DIR}/src/config.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/libnetconf2)
 
 # install pkg-config file

FindLibNETCONF2.cmake

@@ -4,11 +4,12 @@
 #  LIBNETCONF2_FOUND - system has LibNETCONF2
 #  LIBNETCONF2_INCLUDE_DIRS - the LibNETCONF2 include directory
 #  LIBNETCONF2_LIBRARIES - Link these to use LibNETCONF2
+#  LIBNETCONF2_VERSION - SO version of the found libNETCONF2 library
 #  LIBNETCONF2_ENABLED_SSH - LibNETCONF2 was compiled with SSH support
 #  LIBNETCONF2_ENABLED_TLS - LibNETCONF2 was compiled with TLS support
 #
 #  Author Michal Vasko <[email protected]>
-#  Copyright (c) 2020 CESNET, z.s.p.o.
+#  Copyright (c) 2021 CESNET, z.s.p.o.
 #
 #  Redistribution and use in source and binary forms, with or without
 #  modification, are permitted provided that the following conditions
@@ -34,7 +35,6 @@
 #  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 include(FindPackageHandleStandardArgs)
-include(CheckSymbolExists)
 
 if(LIBNETCONF2_LIBRARIES AND LIBNETCONF2_INCLUDE_DIRS)
     # in cache already
@@ -68,13 +68,28 @@ else()
         ${CMAKE_INSTALL_PREFIX}/lib
     )
 
+    if(LIBNETCONF2_INCLUDE_DIR)
+        find_path(NC_VERSION_PATH "nc_version.h" HINTS ${LIBNETCONF2_INCLUDE_DIR})
+        if(NOT NC_VERSION_PATH)
+            message(STATUS "libnetconf2 version header not found, assuming libnetconf2 is too old and cannot be used!")
+            set(LIBNETCONF2_INCLUDE_DIR "LIBNETCONF2_INCLUDE_DIR-NOTFOUND")
+            set(LIBNETCONF2_LIBRARY "LIBNETCONF2_LIBRARY-NOTFOUND")
+        else()
+            file(READ "${NC_VERSION_PATH}/nc_version.h" NC_VERSION_FILE)
+            string(REGEX MATCH "#define NC_VERSION \"[0-9]+\\.[0-9]+\\.[0-9]+\"" NC_VERSION_MACRO "${NC_VERSION_FILE}")
+            string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" LIBNETCONF2_VERSION "${NC_VERSION_MACRO}")
+        endif()
+    endif()
+
     set(LIBNETCONF2_INCLUDE_DIRS ${LIBNETCONF2_INCLUDE_DIR})
     set(LIBNETCONF2_LIBRARIES ${LIBNETCONF2_LIBRARY})
     mark_as_advanced(LIBNETCONF2_INCLUDE_DIRS LIBNETCONF2_LIBRARIES)
 
     # handle the QUIETLY and REQUIRED arguments and set SYSREPO_FOUND to TRUE
     # if all listed variables are TRUE
-    find_package_handle_standard_args(LibNETCONF2 DEFAULT_MSG LIBNETCONF2_LIBRARY LIBNETCONF2_INCLUDE_DIR)
+    find_package_handle_standard_args(LibNETCONF2 FOUND_VAR LIBNETCONF2_FOUND
+        REQUIRED_VARS LIBNETCONF2_LIBRARY LIBNETCONF2_INCLUDE_DIR
+        VERSION_VAR LIBNETCONF2_VERSION)
 
     # check the configured options and make them available through cmake
     list(INSERT CMAKE_REQUIRED_INCLUDES 0 "${LIBNETCONF2_INCLUDE_DIR}")

nc_version.h.in

@@ -0,0 +1,32 @@
+/**
+ * @file nc_version.h
+ * @author Michal Vasko <[email protected]>
+ * @brief libnetconf2 version information
+ *
+ * @copyright
+ * Copyright (c) 2021 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#ifndef NC_VERSION_H_
+#define NC_VERSION_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NC_VERSION_MAJOR @LIBNETCONF2_MAJOR_SOVERSION@ /**< libnetconf2 major version number */
+#define NC_VERSION_MINOR @LIBNETCONF2_MINOR_SOVERSION@ /**< libnetconf2 minor version number */
+#define NC_VERSION_MICRO @LIBNETCONF2_MICRO_SOVERSION@ /**< libnetconf2 micro version number */
+#define NC_VERSION "@LIBNETCONF2_SOVERSION_FULL@" /**< libnetconf2 version string */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NC_VERSION_H_ */