https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103635
--- Comment #6 from Mark Harmstone <mark at harmstone dot com> --- Created attachment 51973 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51973&action=edit preprocessed source Thanks Andrew, attached. Relevant bits: typedef unsigned int size_t; typedef unsigned int uintptr_t; Both are "unsigned long long" for -mabi=ms.