if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE}) return() endif() add_subdirectory(${LIBC_TARGET_ARCHITECTURE}) add_header_library( darwin_util HDRS io.h quick_exit.h syscall.h DEPENDS .${LIBC_TARGET_ARCHITECTURE}.darwin_util libc.src.__support.common libc.src.__support.CPP.string_view )