Generate cnats-config-version.cmake (#813)

* provide cnats-config-version.cmake to be able to define required version in find_package

* change from requiring same major version to same minor version

---------

Co-authored-by: Rolf Lussi <rolf.lussi@kistler.com>

CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.13)
 project(cnats)
 include(CTest)
 include(FindPackageHandleStandardArgs)
+include(CMakePackageConfigHelpers)
 
 # Uncomment to have the build process verbose
 # set(CMAKE_VERBOSE_MAKEFILE TRUE)
@@ -258,6 +259,11 @@ set(NATS_VERSION_SUFFIX "-beta")
 
 set(NATS_VERSION_REQUIRED_NUMBER 0x030900)
 
+write_basic_package_version_file(
+  "${PROJECT_BINARY_DIR}/cnats-config-version.cmake"
+  COMPATIBILITY SameMinorVersion
+  VERSION ${NATS_VERSION_MAJOR}.${NATS_VERSION_MINOR}.${NATS_VERSION_PATCH}${NATS_VERSION_SUFFIX})
+
 if(NATS_UPDATE_VERSION OR NATS_UPDATE_DOC)
 configure_file(
 	${CMAKE_CURRENT_SOURCE_DIR}/src/version.h.in

src/CMakeLists.txt

@@ -67,6 +67,8 @@ if(NATS_BUILD_LIB_SHARED)
         NAMESPACE cnats::
         FILE cnats-config.cmake
         DESTINATION ${NATS_LIBDIR}/cmake/cnats)
+  install(FILES "${PROJECT_BINARY_DIR}/cnats-config-version.cmake"
+        DESTINATION ${NATS_LIBDIR}/cmake/cnats)
 endif(NATS_BUILD_LIB_SHARED)
 
 if(NATS_BUILD_LIB_STATIC)
@@ -79,6 +81,8 @@ if(NATS_BUILD_LIB_STATIC)
         NAMESPACE cnats::
         FILE cnats-config.cmake
         DESTINATION ${NATS_LIBDIR}/cmake/cnats)
+  install(FILES "${PROJECT_BINARY_DIR}/cnats-config-version.cmake"
+        DESTINATION ${NATS_LIBDIR}/cmake/cnats)
 endif(NATS_BUILD_LIB_STATIC)
 
 install(FILES deprnats.h DESTINATION ${NATS_INCLUDE_DIR} RENAME nats.h)