Richard W.M. Jones wrote: Hi Rich, As you no doubt realize, that is because the expansion of your assert expression is so long. Think of it as encouragement to use inline functions in place of macros whenever possible. This is a good example of how inline functions are superior, in addition to the usual more-type-safe argument. E.g., #define STREQ(a,b) (strcmp(a,b) == 0) static inline int block_id_eq (const struct hive_h *h, size_t offset, const char *s) { return STREQ (((struct ntreg_hbin_block *)(h->addr + offset))->id, s); } static size_t insert_lf_record (struct hive_h *h, size_t old_offs, size_t posn, const char *name, hive_node_h node) { assert (block_id_eq (h, old_offs, "lf") || block_id_eq (h, old_offs, "lh")); }