Hi! When I building 32-bit mingw-w64 multilib runtime without -march\-mtune its very well, but if I use -march=i686 -mtune=core2 I have error: "CPU you selected does not support x86-64 instruction set" And I have some questions: 1. If I don't specify any -march/-mtune what is used by default in GCC when I build multilib toolchain? 2. Can I build multilib toolchain with -march=i686 or it's impossible? 3. If I use toolchain builded without -march/-mtune it generate incorrect code with -march=corei7-avx. Is it GCC FEATURE or BUG?
