https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61546
--- Comment #4 from Anton Baskanov <baskanov at gmail dot com> --- (In reply to Ozkan Sezer from comment #3) > (In reply to Anton Baskanov from comment #2) > > > > why libgcc uses #define for __int64 instead of typedef? > > MinGW and MinGW-w64 use #define instead of a typedef, because that allows > for uses like 'signed __int64' and 'unsigned __int64', i.e. __int64 isn't > native to gcc. OK, got it. Thanks for the answer!