Added (and configure in CMake) a revision.h.in containing the version number

dlib/CMakeLists.txt

@@ -438,6 +438,9 @@ if (NOT TARGET dlib)
        # overwrite config.h with the configured one
        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/config.h DESTINATION include/dlib)
 
+       configure_file(${CMAKE_SOURCE_DIR}/../dlib/revision.h.in ${CMAKE_CURRENT_BINARY_DIR}/revision.h)
+       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/revision.h DESTINATION include/dlib)
+
        install(FILES "LICENSE.txt" DESTINATION share/doc/dlib)
 
    endif()

dlib/revision.h.in

+#ifndef DLIB_REVISION_H
+#define DLIB_MAJOR_VERSION  @CPACK_PACKAGE_VERSION_MAJOR@
+#define DLIB_MINOR_VERSION  @CPACK_PACKAGE_VERSION_MINOR@
+#define DLIB_PATCH_VERSION  @CPACK_PACKAGE_VERSION_PATCH@
+#endif
+