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cpp(1)
cpp(1) User Commands cpp(1)
NAME
cpp - the C language preprocessor
SYNOPSIS
/usr/lib/cpp [-BCHMpPRT] [-undef] [-Dname] [-Dname = def]
[-Idirectory] [-Uname] [-Ydirectory]
[input-file [output-file]]
DESCRIPTION
cpp is the C language preprocessor. cpp also used as a first-pass pre‐
processor for other Sun compilers.
Although cpp can be used as a macro processor, this is not normally
recommended, as its output is geared toward that which would be accept‐
able as input to a compiler's second pass. Thus, the preferred way to
invoke cpp is through a compilation command. For general-purpose macro-
processing, see m4(1).
cpp optionally accepts two filenames as arguments. input-file and out‐
put-file are, respectively, the input and output files for the pre‐
processor. They default to the standard input and the standard output.
OPTIONS
The following options are supported:
-B Supports the C++ comment indicator //. With this indica‐
tor, everything on the line after the // is treated as a
comment.
-C Passes all comments (except those that appear on cpp
directive lines) through the preprocessor. By default,
cpp strips out C-style comments.
-H Prints the pathnames of included files, one per line on
the standard error.
-M Generates a list of makefile dependencies and write them
to the standard output. This list indicates that the
object file which would be generated from the input file
depends on the input file as well as the include files
referenced.
-p Uses only the first eight characters to distinguish pre‐
processor symbols, and issue a warning if extra tokens
appear at the end of a line containing a directive.
-P Preprocesses the input without producing the line con‐
trol information used by the next pass of the C com‐
piler.
-R Allows recursive macros.
-T Uses only the first eight characters for distinguishing
different preprocessor names. This option is included
for backward compatibility with systems which always use
only the first eight characters.
-undef Removes initial definitions for all predefined symbols.
-Dname Defines name as 1 (one). This is the same as if a
-Dname=1 option appeared on the cpp command line, or as
if a
#define name 1
line appeared in the source file that cpp is processing.
-Dname=def Defines name as if by a #define directive. This is the
same as if a
#define name def
line appeared in the source file that cpp is processing.
The -D option has lower precedence than the -U option.
That is, if the same name is used in both a -U option
and a -D option, the name will be undefined regardless
of the order of the options.
-Idirectory Inserts directory into the search path for #include
files with names not beginning with /. directory is
inserted ahead of the standard list of include directo‐
ries. Thus, #include files with names enclosed in dou‐
ble-quotes (") are searched for first in the directory
of the file with the #include line, then in directories
named with -I options, and lastly, in directories from
the standard list. For #include files with names
enclosed in angle-brackets (<>), the directory of the
file with the #include line is not searched. See Details
below for exact details of this search order.
-Uname Removes any initial definition of name, where name is a
symbol that is predefined by a particular preprocessor.
Here is a partial list of symbols that may be prede‐
fined, depending upon the architecture of the system:
Operating System: ibm, gcos, os, tss and unix
Hardware: interdata, u3b20d, ns32000,
i386, sparc, and sun
UNIX system variant: RES, and RT
The lint command: lint
The symbols sun, sparc and unix are defined for all Sun
systems.
-Ydirectory Uses directory in place of the standard list of directo‐
ries when searching for #include files.
USAGE
Directives
All cpp directives start with a hash symbol (#) as the first character
on a line. White space (SPACE or TAB characters) can appear after the
initial # for proper indentation.
#define name token-string
Replace subsequent instances of name with token-string.
#define name(argument [, argument] ... ) token-string
There can be no space between name and the `('. Replace subsequent
instances of name, followed by a parenthesized list of arguments,
with token-string, where each occurrence of an argument in the
token-string is replaced by the corresponding token in the comma-
separated list. When a macro with arguments is expanded, the argu‐
ments are placed into the expanded token-string unchanged. After
the entire token-string has been expanded, cpp re-starts its scan
for names to expand at the beginning of the newly created token-
string.
#undef name
Remove any definition for the symbol name. No additional tokens are
permitted on the directive line after name.
#include "filename"
#include <filename>
Read in the contents of filename at this location. This data is
processed by cpp as if it were part of the current file. When the
<filename> notation is used, filename is only searched for in the
standard include directories. See the -I and -Y options above for
more detail. No additional tokens are permitted on the directive
line after the final " or >.
#line integer-constant" filename"
Generate line control information for the next pass of the C com‐
piler. integer-constant is interpreted as the line number of the
next line and filename is interpreted as the file from where it
comes. If "filename" is not given, the current filename is
unchanged. No additional tokens are permitted on the directive line
after the optional filename.
#if constant-expression
Subsequent lines up to the matching #else, #elif, or #endif direc‐
tive, appear in the output only if constant-expression yields a
nonzero value. All binary non-assignment C operators, including &&,
||, and ,, are legal in constant-expression. The ?:operator, and
the unary −, !, and ~ operators, are also legal in constant-expres‐
sion.
The precedence of these operators is the same as that for C. In
addition, the unary operator defined, can be used in constant-
expression in these two forms: `defined ( name )' or `defined
name'. This allows the effect of #ifdef and #ifndef directives
(described below) in the #if directive. Only these operators, inte‐
ger constants, and names that are known by cpp should be used
within constant-expression. In particular, the size of operator is
not available.
#ifdef name
Subsequent lines up to the matching #else, #elif, or #endif appear
in the output only if name has been defined, either with a #define
directive or a -D option, and in the absence of an intervening
#undef directive. Additional tokens after name on the directive
line will be silently ignored.
#ifndef name
Subsequent lines up to the matching #else, #elif, or #endif appear
in the output only if name has not been defined, or if its defini‐
tion has been removed with an #undef directive. No additional
tokens are permitted on the directive line after name.
#elif constant-expression
Any number of #elif directives may appear between an #if, #ifdef,
or #ifndef directive and a matching #else or #endif directive. The
lines following the #elif directive appear in the output only if
all of the following conditions hold:
o The constant-expression in the preceding #if directive
evaluated to zero, the name in the preceding #ifdef is
not defined, or the name in the preceding #ifndef direc‐
tive was defined.
o The constant-expression in all intervening #elif direc‐
tives evaluated to zero.
o The current constant-expression evaluates to non-zero.
If the constant-expression evaluates to non-zero, subsequent #elif
and #else directives are ignored up to the matching #endif. Any
constant-expression allowed in an #if directive is allowed in an
#elif directive.
#else
This inverts the sense of the conditional directive otherwise in
effect. If the preceding conditional would indicate that lines are
to be included, then lines between the #else and the matching
#endif are ignored. If the preceding conditional indicates that
lines would be ignored, subsequent lines are included in the out‐
put. Conditional directives and corresponding #else directives can
be nested.
#endif
End a section of lines begun by one of the conditional directives
#if, #ifdef, or #ifndef. Each such directive must have a matching
#endif.
Macros
Formal parameters for macros are recognized in #define directive bod‐
ies, even when they occur inside character constants and quoted
strings. For instance, the output from:
#define abc(a)|`|a|
abc(xyz)
is:
# 1 ""
|`|xyz |
The second line is a NEWLINE. The last seven characters are |`|xyz|
(vertical-bar, back quote, vertical-bar, x, y, z, vertical-bar). Macro
names are not recognized within character constants or quoted strings
during the regular scan. Thus:
#define abc xyz
printf("abc");
does not expand abc in the second line, since it is inside a quoted
string that is not part of a #define macro definition.
Macros are not expanded while processing a #define or #undef. Thus:
#define abc zingo
#define xyz abc
#undef abc
xyz
produces abc. The token appearing immediately after an #ifdef or #ifn‐
def is not expanded.
Macros are not expanded during the scan which determines the actual
parameters to another macro call.
#define reverse(first,second)second first
#define greeting hello
reverse(greeting,
#define greeting goodbye
)
produces
#define hello goodbye hello
Output
Output consists of a copy of the input file, with modifications, plus
lines of the form:
#lineno " filename" "level"
indicating the original source line number and filename of the follow‐
ing output line and whether this is the first such line after an
include file has been entered (level=1), the first such line after an
include file has been exited (level=2), or any other such line (level
is empty).
Details
This section contains usage details.
Directory Search Order
#include files are searched for in the following order:
1. The directory of the file that contains the #include request
(that is, #include is relative to the file being scanned
when the request is made).
2. The directories specified by -I options, in left-to-right
order.
3. The standard directory(s) (/usr/include on UNIX systems).
Special Names
Two special names are understood by cpp. The name _ _LINE_ _ is defined
as the current line number (a decimal integer) as known by cpp, and _
_FILE_ _ is defined as the current filename (a C string) as known by
cpp. They can be used anywhere (including in macros) just as any other
defined name.
Newline Characters
A NEWLINE character terminates a character constant or quoted string.
An escaped NEWLINE (that is, a backslash immediately followed by a NEW‐
LINE) may be used in the body of a #define statement to continue the
definition onto the next line. The escaped NEWLINE is not included in
the macro value.
Comments
Comments are removed (unless the -C option is used on the command
line). Comments are also ignored, except that a comment terminates a
token.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
non-zero An error occurred.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitydeveloper/build/make
SEE ALSO
m4(1), attributes(7)
DIAGNOSTICS
The error messages produced by cpp are intended to be self-explanatory.
The line number and filename where the error occurred are printed along
with the diagnostic.
NOTES
When NEWLINE characters were found in argument lists for macros to be
expanded, some previous versions of cpp put out the NEWLINE characters
as they were found and expanded. The current version of cpp replaces
them with SPACE characters.
Because the standard directory for included files may be different in
different environments, this form of #include directive:
#include <file.h>
should be used, rather than one with an absolute path, like:
#include "/usr/include/file.h"
cpp warns about the use of the absolute pathname.
While the compiler allows 8-bit strings and comments, 8-bits are not
allowed anywhere else.
Solaris 11.4 7 Dec 2010 cpp(1)