build system: minor changes (close #478)

CMakeLists.txt

@@ -37,12 +37,12 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-message("*")
-message("* ${PROJECT_NAME} v${PROJECT_VERSION} (${CMAKE_BUILD_TYPE})")
-message("* Copyright (c) 2017-2020 Michele Caini <michele.caini@gmail.com>")
-message("*")
+message(VERBOSE "*")
+message(VERBOSE "* ${PROJECT_NAME} v${PROJECT_VERSION} (${CMAKE_BUILD_TYPE})")
+message(VERBOSE "* Copyright (c) 2017-2020 Michele Caini <michele.caini@gmail.com>")
+message(VERBOSE "*")
 
-option(USE_LIBCPP "Use libc++ by adding -stdlib=libc++ flag if availbale." ON)
+option(USE_LIBCPP "Use libc++ by adding -stdlib=libc++ flag if availbale." OFF)
 option(USE_ASAN "Use address sanitizer by adding -fsanitize=address -fno-omit-frame-pointer flags" OFF)
 
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