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The assembly part of a compiler is at the back end of the build process. A build process takes instructions from a programming language and converts them into machine instructions. When you need to make machine instructions for a machine that is different than the type you are programming on you need a cross compiler. For instance, if you have a PC with an Intel X86 and you want machine instructions for an Xbox with a PowerPC inside then you would need to cross compile. You could take some intermediate output from your compilation process on the PC and use a cross assembler to make PowerPC instructions. Thus you would be using a cross assembler.

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A cross-assembler is an assembler that generates machine language for a different type of computer than the one the assembler is running in. It is used to develop programs for computers on a chip or microprocessors used in specialized applications that are either too small or are otherwise incapable of handling the development software.

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Q: What is the Difference between an assembler and cross assembler?
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