How do I compile mac osx app developed on 64 bit Mac OSX to run on 32 bit?

Question

I am writing a program in mac osx mountain lion 10.8 in Objective C/C++ . The machine is 64 bit. I am new to mac world coming from windows .Net development and C/C++

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Answer 1

Set the Base SDK to Current version of Mac (ex. 10.7) Set the Deployment SDK to older version (ex.1.4)

Change Deployment target as :

Change Base SDK as:

Just above this you will find architectures, you can change them to 32 or 64 as your need