For anyone could succeed compiling gcc-4.6, could you paste a correct ggc_alloc_cleared_lang_type macro ?
just run this grep command under your build directory, gcc-4.6-build$ grep -RsInw ggc_alloc_cleared_lang_type gcc/ gcc/gtype-desc.h:2451:#define ggc_alloc_cleared_lang_type() ((struct lang_type *)(ggc_internal_cleared_alloc_stat (sizeof (struct lang_type) MEM_STAT_INFO))) thanks,