declare_cache_var instead of option

Author: Ricardicus

CMakeLists.txt

@@ -31,12 +31,11 @@ status_print(project_version)
 declare_cache_var(ZENOHCXX_ZENOHC ON BOOL "Build for Zenoh-c target")
 declare_cache_var(ZENOHCXX_ZENOHPICO OFF BOOL "Build for Zenoh-pico target")
 declare_cache_var(ZENOHCXX_EXAMPLES_PROTOBUF ON BOOL "Build Protobuf example (turn off if you have problems with installed Protobuf version)")
+declare_cache_var(ENABLE_TESTS "Enable building tests" ON)
+declare_cache_var(ENABLE_EXAMPLES "Enable building examples" ON)
 
 set_default_build_type(Release)
 
-option(ENABLE_TESTS "Enable building tests" ON)
-option(ENABLE_EXAMPLES "Enable building examples" ON)
-
 # zenohcxx without dependencies
 add_library(zenohcxx INTERFACE)
 target_include_directories(zenohcxx INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}/include")
@@ -73,9 +72,9 @@ endif()
 
 
 add_subdirectory(install)
-enable_testing()
 
 if(ENABLE_TESTS)
+    enable_testing()
     add_subdirectory(tests)
 else()
     message(STATUS "Tests are disabled.")