CPP(8) CPP(8)
NAME
cpp - C language preprocessor
SYNOPSIS
/lib/cpp [ option ... ] [ ifile [ ofile ] ]
DESCRIPTION
Cpp interprets preprocessor directives and does macro sub-
stitution for cc(1) and other compilers. The input ifile
and output ofile default to standard input and standard out-
put respectively.
The options are:
-P Do not place line number markings in output.
-C Do not remove comments.
-Uname
-Dname
-Dname=def
-Idir
Same as in cc(1). -U overrides -D.
-H Report all included files on standard error file,.
-M Attach modification date to file names in line number
directives thus: file@modtime, where modtime is the
integer number of seconds since the epoch.
-T Truncate preprocessor symbols to eight characters.
-Ydir
Use dir instead of as the last resort in searching for
include files.
The output file contains processed text sprinkled with lines
that show the original input line numbering:
# linenumber "ifile"
The input language is as described in the reference, with a
few additions:
The # linenumber marks placed in the output are accepted as
an alternative to the official #line directive.
These symbols are predefined in various implementations:
ibm gcos os tss unix
CPP(8) CPP(8)
interdata pdp11 u370 u3b u3b5 vax
RES RT
lint
Preprocessor formal parameters are recognized within quoted
strings in the replacement text.
When comments are removed they are replaced by null strings;
this unofficial feature makes it possible to construct iden-
tifiers by concatenation.
FILES
standard directory for include files
SEE ALSO
B. W. Kernighan and D. M. Ritchie, The C Programming
Language, Prentice-Hall, 1988