macOS How to change GCC compiler from 64bit to 32bit in Eclipse?

[killjanuary]

My laptop is running at 64bit model (Snow Leopard).

I just installed Eclipse CDT and Xcode(for GCC).

I compiled a 'helloworld' program in Eclipse CDT, I found its binary file is compiled in x86_64 model.

How to change the GCC compiler from 64bit to 32 bit by default in Eclipse CDT ?
Thank you .
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I can change this easily in Xcode like this:

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However, I donot know how to do in Eclipse..

 

[lloyddean]

<http://ysasaki600.wordpress.com/2009/09/19/week2-tutorial-for-eclipse-wtp/>