How to see which CPU is on the current machine? I'm looking on the 'safe' Cflags on the Gentoo Wiki, and I want to figure out how to see which CPU is on a specific machine. 

On Gentoo I see you can get this with 

cat /proc/cpuinfo


but on Mac I get 


  No such file or directory


What is the equivalent for OS X?
From terminal, you'll want to start with system_profiler

 system_profiler SPHardwareDataType


Also, much more data is available from ioreg but you'll need to parse the output (which can arrive as XML if you prefer) to get things like actual bus and clock frequency of each core.