Comments may appear anywhere where white space may appear in the configuration file. There are two kinds of comments: single-line and multi-line comments. Single-line comments start with ‘#’ or ‘//’ and continue to the end of the line:
# This is a comment // This too is a comment
The following constructs, appearing at the start of a line are treated specially: ‘#include’, ‘#include_once’, ‘#line’, ‘# num’ (where num is a decimal number). These are described in detail in Preprocessor.
Multi-line or C-style comments start with the two characters ‘/*’ (slash, star) and continue until the first occurrence of ‘*/’ (star, slash).
Multi-line comments cannot be nested.