64-bit mingw compiler doesn't

[Daniel Colascione]

$ x86_64-w64-mingw32-g++ helloworld.cpp
/Users/dancol/AppData/Local/Temp/2/ccsQs1zP.s: Assembler messages:
/Users/dancol/AppData/Local/Temp/2/ccsQs1zP.s:10: Error: bad register
name `%rbp'
/Users/dancol/AppData/Local/Temp/2/ccsQs1zP.s:11: Error: bad register
name `%rsp'
/Users/dancol/AppData/Local/Temp/2/ccsQs1zP.s:12: Error: bad register
name `%rsp'
/Users/dancol/AppData/Local/Temp/2/ccsQs1zP.s:14: Error: bad register
name `%rip)'

$ cat helloworld.cpp
#include <stdio.h>
int main()
{
    printf("Hello, world!\n");
}

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