How to tell which compiler was used?

[Yan Seiner]

I have a set of binaries that were cross-compiled.  The manufacturer 
supplies 2 gcc- based toolchains.

I'd like to find out which toolchain was used to build the binaries.

One is based on gcc-3.3, the other is based on gcc-4.0.1.

Is there some way to tell which compiler was used to build a particular 
binary?

Thanks,

--Yan