http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/ABI-and-ISA.html
On
GNU/Linux, depending on the default gcc mode, applications must be
compiled with gcc -m64 On Solaris applications must be compiled with gcc -m64 -mptr64 -Wa,-xarch=v9 -mcpu=v9
cc -xarch=v9 On the BSD sparc64 systems no special options are required, since 64-bits is
the only ABI available. ‘ ABI=32 ’ For the basic 32-bit ABI, GMP still uses as much of the V9 ISA as it can.