3 cpp \- C language preprocessor
17 interprets ANSI C preprocessor directives
18 and does macro substitution.
23 default to standard input and standard output respectively.
42 Generate no output except a list of include files
43 in a form suitable for specifying dependencies to
45 Use twice to list files in angle brackets.
48 Turn off default include directories. All must be
51 or in the environment variable
57 are used as the last two searched directories for include directives,
60 is read from the environment.
63 Print extra debugging information.
68 directives into the output.
71 Understand C++ comments.
74 Inhibit include search in the source's directory.
77 Print the list of directories searched when
80 Last listed are searched first.
85 option, the processed text output is sprinkled
86 with lines that show the original input line numbering:
93 The command reads the environment variable
95 and adds its (blank-separated) list of directories to
96 the standard search path for
98 directives. They are looked at before any directories specified with
100 which are looked at before the default directories.
102 The input language is as described in the ANSI C standard.
103 The standard Plan 9 C compilers do not use
105 they contain their own simple but adequate preprocessor, so
107 is usually superfluous.
112 directory for machine-independent include files
115 directory for machine-dependent include files