newlib ML を探してみたら、どうやら %a は対応済みらしい。 2007-05-11 Eric Blake <ebb9@byu.net> Minimize printf/scanf size on platforms that don't need C99. * acconfig.h (_WANT_IO_C99_FORMATS): New macro. * newlib.hin (_WANT_IO_C99_FORMATS): Likewise. * c</ebb9@byu.net>…