linklibsys.cmake
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linklibsys.cmake
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	# https://stackoverflow.com/questions/52135983/cmake-target-link-libraries-include-as-system-to-suppress-compiler-warnings

	function(target_link_libraries_system target)
	set(options PRIVATE PUBLIC INTERFACE)
	cmake_parse_arguments(TLLS "${options}" "" "" ${ARGN})
	foreach(op ${options})
	if(TLLS_${op})
	set(scope ${op})
	endif()
	endforeach(op)
	set(libs ${TLLS_UNPARSED_ARGUMENTS})

	foreach(lib ${libs})
	get_target_property(lib_include_dirs ${lib} INTERFACE_INCLUDE_DIRECTORIES)
	if(lib_include_dirs)
	if(scope)
	target_include_directories(${target} SYSTEM ${scope} ${lib_include_dirs})
	else()
	target_include_directories(${target} SYSTEM PRIVATE ${lib_include_dirs})
	endif()
	else()
	message("Warning: ${lib} doesn't set INTERFACE_INCLUDE_DIRECTORIES. No include_directories set.")
	endif()
	if(scope)
	target_link_libraries(${target} ${scope} ${lib})
	else()
	target_link_libraries(${target} ${lib})
	endif()
	endforeach()
	endfunction(target_link_libraries_system)