[CMake] How to pass a flag to be used by cmake?

[Georgios Petasis]

Hi all,

I want to build 32-bit binaries on a 64-bit Linux system, with gcc.
In projects that use configure, this is easy:

export CFLAGS=-m32

But how can I do the same with cmake projects?

cmake does not seem to use CFLAGS. Is there a variable I can define when 
I run cmake, to pass the -m32 flag to gcc?

George