I know I'm at least partly to blame for this :) With a LTO bootstrap I get now
/home/ak/gcc/git/gcc/libcpp/lex.c:2838:1: sorry, unimplemented: gimple bytecode streams do not support the target attribute because of the new __target__ use in libcpp/lex.c -- Summary: target use in libcpp breaks LTO bootstrap Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: lto AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: andi-gcc at firstfloor dot org GCC host triplet: x86_64-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45477