The start file is the program that is executed before the main and simple applications. C libraries are also needed. These are used to interface to the kernel and the system calls. These need to be specified in the example. gcc will be used to turn off the default start files, trigger a special flat file object linker, and specify where the start file, the object, the test code, and the libraries are. The Blackfin has an assembler syntax called arithmetic notation, which allows users to see what the assembler is doing in an understandable format. The assembly output can be seen during testing or by specifying a -S compiler option. That will give the assembler the corresponding C code which can then relate the two.