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Hi, I would like to know how can I switch Xcode 3 (Xcode 3 is the Apple programing tool for mac os, it uses GCC)to understand Intel Assembler syntax instead of AT&T's, so I can assemble such written pieces of software. thanks a lot.

XCode uses the GAS assembler. That means, fortunately, that you can use normal GAS stuff.

Try .intel_syntax at the top of your source files.

http://www.osdev.org/wiki/Gas_Intel_Howto