cpp man page on Plan9

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CPP(1)									CPP(1)

       cpp - C language preprocessor

       cpp [ option ...	 ] [ ifile [ ofile ] ]

       Cpp  interprets ANSI C preprocessor directives and does macro substitu‐
       tion.  The input ifile and output ofile default to standard  input  and
       standard output respectively.

       The options are:

       -Idir  Same as in 8c(1): add dir to the search for directives.

       -M     Generate	no  output  except  a  list of include files in a form
	      suitable for specifying dependencies to  mk(1).	Use  twice  to
	      list files in angle brackets.

       -N     Turn  off	 default  include  directories.	 All must be specified
	      with -I, or in the environment variable include.	 Without  this
	      option,  /$objtype/include and /sys/include are used as the last
	      two searched directories for include directives, where  $objtype
	      is read from the environment.

       -V     Print extra debugging information.

       -P     Do not insert ``#line'' directives into the output.

       -+     Understand C++ comments.

       -.     Inhibit include search in the source's directory.

       -i     Print  the  list of directories searched when #include is found.
	      Last listed are searched first.

       In the absence of the -P option, the processed text output is sprinkled
       with lines that show the original input line numbering:

	      #line linenumber "ifile"

       The command reads the environment variable include and adds its (blank-
       separated) list of directories to the standard search path  for	direc‐
       tives.	They  are  looked at before any directories specified with -I,
       which are looked at before the default directories.

       The input language is as described in the ANSI C standard.   The	 stan‐
       dard  Plan  9 C compilers do not use cpp; they contain their own simple
       but adequate preprocessor, so cpp is usually superfluous.

	      directory for machine-independent include files

	      directory for machine-dependent include files



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