How to find out if a given gcc is a cross compiler?

[Toralf Lund]

I'm looking a nice and simple way to find out if a given gcc command 
actually specifies a cross compiler, or if I'm cross compiling when 
using it, if you like. Does anyone know a simple way to find out? I 
suppose I can compare the target type as output from -dumpmachine with 
the current host type, but is there a single, reliable way of finding 
that, and getting the value in the same format as the target? Or should 
that be "build" machine instead of "host"? I never seem to learn which 
is which, but the point remains: I'm not sure I know a good way to find it.

I'm usually building on a Linux system, but would very much prefer the 
method to be as portable as possible.

- Toralf



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