http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/ABI-and-ISA.html
GMP
will be slower than in n32 or 64, this option only exists to support old
compilers, e.g. GCC 2.7.2. Applications can be compiled with no special
flags on an old compiler, or on a newer compiler with gcc -mabi=32
cc -32 ‘ ABI=n32 ’ The n32 ABI is 32-bit pointers and integers, but with a 64-bit limb using a long long .