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 . ========================== I can change this easily in Xcode like this: ========================== However, I donot know how to do in Eclipse..