http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54780
--- Comment #5 from Andreas Schwab <sch...@linux-m68k.org> 2012-10-03 13:10:32 UTC --- > I guess this is not a big issue if you are using Autotools, where the > established practice is to compile inside the source directory. It is common practice to build outside the source directory, since it is very well supported.