It does not do macro processing, include file handling, or anything else you may get from your C compiler’s preprocessor. You can do include file processing with the
). You can use the GNU
C compiler driver to get other “CPP” style preprocessing by giving the input file a ‘.S
’ suffix. See Options Controlling the Kind of Output
in Using GNU CC
Excess whitespace, comments, and character constants cannot be used in the portions of the input text that are not preprocessed.
If the first line of an input file is
or if you use the ‘-f
’ option, whitespace and comments are not removed from the input file. Within an input file, you can ask for whitespace and comment removal in specific portions of the by putting a line that says
before the text that may contain whitespace or comments, and putting a line that says
after this text. This feature is mainly intend to support
statements in compilers whose output is otherwise free of comments and whitespace.