Align osx&linux build

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 4.0.0)
+cmake_minimum_required(VERSION 3.12)
 project(libucore C)
 
 execute_process(COMMAND git -C ${CMAKE_SOURCE_DIR} describe --abbrev=5 --dirty --always OUTPUT_VARIABLE version_revision  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -28,6 +28,12 @@ if (BUILD_SANITIZE)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address")
 endif()
 
+if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the type of build." FORCE)
+  # Set the property for multi-config generators as well, if applicable
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS Debug Release RelWithDebInfo MinSizeRel)
+endif()
+
 include_directories(include)
 
 add_subdirectory(src)