Comment by eslaught

Just popping in here because people seem to be surprised by

> I build on the exact hardware I intend to deploy my software to and ship it to another machine with the same specs as the one it was built on.

This is exactly the use case in HPC. We always build -march=native and go to some trouble to enable all the appropriate vectorization flags (e.g., for PowerPC) that don't come along automatically with the -march=native setting.

Every HPC machine is a special snowflake, often with its own proprietary network stack, so you can forget about binaries being portable. Even on your own machine you'll be recompiling your binaries every time the machine goes down for a major maintenance.