http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55821
--- Comment #2 from Andreas Schwab <sch...@linux-m68k.org> 2012-12-28 10:58:39 UTC --- That override is only needed so that libquadmath.info is built in the build directory instead of the source directory. If you want to suppress installing the info file don't set info_TEXINFOS.