2010/6/15 Basile Starynkevitch <bas...@starynkevitch.net>: > /*** NOTE: june 2010. > > GCC 4.6 has a new typed garbage collected allocator; so any > GTY-ed struct FOO_ST should be allocated using ggc_alloc_FOO_ST > or ggc_alloc_cleared_FOO_ST. > ***/ > #if BUILDING_GCC_VERSION >= 4006 && defined(ggc_alloc_typed) > #define MELT_HAS_TYPED_GGC_ALLOC 1 > #else > #define MELT_HAS_TYPED_GGC_ALLOC 0 > #endif > > By the way, perhaps defined(ggc_alloc_typed) would be enough above.
There is no guarantee ggc_alloc_typed won't change for 4.7 or even 4.6. If you really want to pursue this, perhaps try checking for a typed allocator of a well-known GCC data type: #if defined (ggc_alloc_rtx_def) ... But then again, it may become a function instead of macro in 4.7, breaking the test. > #if MELT_HAS_TYPED_GGC_ALLOC > struct meltobject_st *dst = > ggc_alloc_cleared_meltobject_st (oblen * sizeof > (src->obj_vartab[0])); > #else /*!MELT_HAS_TYPED_GGC_ALLOC*/ > struct meltobject_st *dst = (struct meltobject_st *) > ggc_alloc_cleared (offsetof (struct meltobject_st, > obj_vartab) + > oblen * sizeof (src->obj_vartab[0])); > #endif /*MELT_HAS_TYPED_GGC_ALLOC*/ I'd say, use a common ggc_alloc_cleared_meltobject_st which is made by gengtype in 4.6+ and provide its suitable definition yourself for 4.5. -- Laurynas
