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visibility_flag.cmake
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			# -fvisibility=hidden
			# ---------------------
			# change the default visibility of symbols

			# define the macro !

			# check if the compiler supports it
			check_cxx_compiler_flag("-fvisibility=hidden" HAS_VISIBILITY_HIDDEN)
			# define a set of files to be compiled with the -fvisibility=hidden flag
			function(set_visibility_flag)
			if (HAS_VISIBILITY_HIDDEN)
			set(flags "-fvisibility=hidden")
			endif()
			set_property(SOURCE ${ARGN} APPEND PROPERTY COMPILE_FLAGS "${flags}")
			endfunction(set_visibility_flag)