dlltool: Can't create .lib file: libpython27.a: Invalid bfd target

I'm trying to build a 64-bit version of libpython27.a from python27.dll on Windows 7 x64. Following these instructions, I tried: E:temp>gendef python27.dll * [python27.dll] Found PE+ image E:temp>dlltool --as-flags=--64 -m i386:x86-64 -k --output-lib libpython27.a --i nput-def python27.def dlltool: Can't create .lib file: libpython27.a: Invalid bfd target What can explain dlltool: Can't create .lib file: libpython27.a: Invalid bfd target? dlltool version: E:temp>dlltool -V GNU dlltool (GNU Binutils) 2.23.2 Copyright 2012 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License version 3 or (at your option) any later version. This program has absolutely no warranty.