https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69386
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Hmm, those functions should not be extern "C". Could you please re-run that compile command for eh_arm.cc with -save-temps and send me the preprocessed source? I'll start looking through the mingw-w64 headers for a cause.
