94fb8869df
C99 comments have been the default in compilers for something like 20 years now. This means we don't need to remember to turn it on when porting software, and gets rid of cryptic errors about unterminated character constants when someone writes something like: // Didn't need to... We still accept the flag to avoid breaking mkfiles, but we do nothing with it. This also removes the documentation, since the option does nothing now.
117 lines
2.1 KiB
Plaintext
117 lines
2.1 KiB
Plaintext
.TH CPP 1
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.SH NAME
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cpp \- C language preprocessor
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.SH SYNOPSIS
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.B cpp
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[
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.I option ...
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]
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[
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.I ifile
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[
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.I ofile
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]
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]
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.SH DESCRIPTION
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.I Cpp\^
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interprets ANSI C preprocessor directives
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and does macro substitution.
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The input
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.I ifile
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and output
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.I ofile
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default to standard input and standard output respectively.
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.PP
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The options are:
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.TP
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.BI -D name\^
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.PD 0
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.TP
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.BI -D name=def\^
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.TP
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.BI -I dir\^
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Same as in
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.IR 2c "(1): add
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.I dir
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to the search for
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.CW search
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directives.
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.PD
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.TP
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.B -M
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Generate no output except a list of include files
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in a form suitable for specifying dependencies to
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.IR mk (1).
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Use twice to list files in angle brackets.
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.TP
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.B -N
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Turn off default include directories. All must be
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specified with
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.BR -I ,
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or in the environment variable
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.BR include .
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Without this option,
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.B /$objtype/include
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and
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.B /sys/include
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are used as the last two searched directories for include directives,
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where
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.B $objtype
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is read from the environment.
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.TP
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.B -V
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Print extra debugging information.
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.TP
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.B -P
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Do not insert
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.RB `` #line ''
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directives into the output.
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.TP
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.B -.
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Inhibit include search in the source's directory.
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.TP
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.B -i
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Print the list of directories searched when
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.I #include
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is found.
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Last listed are searched first.
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.PD
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.PP
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In the absence of the
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.B -P
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option, the processed text output is sprinkled
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with lines that show the original input line numbering:
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.IP
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.B #line
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.I linenumber
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.L
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"\fIifile\fP"
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.PP
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The command reads the environment variable
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.IR include
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and adds its (blank-separated) list of directories to
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the standard search path for
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.CW #include
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directives. They are looked at before any directories specified with
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.BR -I ,
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which are looked at before the default directories.
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.PP
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The input language is as described in the ANSI C standard.
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The standard Plan 9 C compilers do not use
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.IR cpp ;
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they contain their own simple but adequate preprocessor, so
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.I cpp
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is usually superfluous.
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.SH FILES
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.TF /objtype/include
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.TP
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.B /sys/include
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directory for machine-independent include files
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.TP
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.B /$objtype/include
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directory for machine-dependent include files
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.SH SOURCE
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.B /sys/src/cmd/cpp
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.SH SEE ALSO
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.IR 2c (1)
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