http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48063
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-03-10 18:50:19 UTC --- Again caused by http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161655 setup_one_parameter has: if (value && value != error_mark_node && !useless_type_conversion_p (TREE_TYPE (p), TREE_TYPE (value))) { if (fold_convertible_p (TREE_TYPE (p), value)) rhs = fold_build1 (NOP_EXPR, TREE_TYPE (p), value); else /* ??? For valid (GIMPLE) programs we should not end up here. Still if something has gone wrong and we end up with truly mismatched types here, fall back to using a VIEW_CONVERT_EXPR to not leak invalid GIMPLE to the following passes. */ rhs = fold_build1 (VIEW_CONVERT_EXPR, TREE_TYPE (p), value); } which obviously can't work when the VCE is invalid. We really shouldn't be trying to inline in that case.