You can use C preprocessor commands in your assembly language source file. If you do this, you must preprocess the file using the C preprocessor, before using armasm to assemble it. See the RealView Compilation Tools Compiler User Guide for more information.

armasm correctly interprets #line commands in the resulting file. It can generate error messages and debug_line tables using the information in the #line commands.

Example 3.1 shows the commands you write to preprocess and assemble a file, source.s. In this example, the preprocessor outputs a file called preprocessed.s, and armasm assembles preprocessed.s.

armcc -E source.s > preprocessed.s
armasm preprocessed.s