cmake cross compiling

On ubuntu 10.10 64bit I want to compile something with cmake for a 32 bit开发者_如何学C ubuntu 10.10 system. How can I do that via a shell command in cmake?

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In CMakeLists.txt add

CMAKE_CXX_FLAGS="-m32"
CMAKE_C_FLAGS="-m32"

make sure that any libraries you are linking to are compiled for 32 bit.