Choose a C binary according to the enviroment

Question

I have compiled my code with specific flags (-Os, -O2, -march=native and their combinations) in order to produce a faster execution time.

But my problem is that I d

Answer 1

What you're talking about is called a fat binary (not FAT, the acronym). From Wikipedia¹:

A fat binary (or multiarchitecture binary) is a computer executable program which has been expanded (or "fattened") with code native to multiple instruction sets which can consequently be run on multiple processor types. This results in a file larger than a normal one-architecture binary file, thus the name.

At quick glance, there doesn't seem to be much support for it (see this question from the Programmer StackExchange for more information). Apple implemented this briefly when transitioning from PowerPC to Intel, but it doesn't seem to have been explored much since then.

Technically, fat binaries refer to a single binary that could run on multiple architectures...but I imagine the premise would hold for a single binary that runs on multiple OSes. And it comes back to the point Bizkit made in his/her/zir answer - generally, you compile your source code for the environment that you're in ahead of time.