This option instructs the compiler to execute only the preprocessor step.
By default, output from the preprocessor is sent to the standard output stream and can be redirected to a file using standard UNIX and MS‑DOS notation.
You can also use the ‑o option to specify a file for the preprocessed output. By default, comments are stripped from the output. The preprocessor accepts source files with any extension, for example, .o, .s, and .txt.
armcc ‑E source.c > raw.c