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.\" ========================================================================

.\"

.IX Title "CPP 1"

.TH CPP 1 "2010-07-31" "gcc-4.5.1" "GNU"

.\" For nroff, turn off justification.  Always turn off hyphenation; it makes

.\" way too many mistakes in technical documents.

.if n .ad l

.nh

.SH "NAME"

cpp \- The C Preprocessor

.SH "SYNOPSIS"

.IX Header "SYNOPSIS"

cpp [\fB\-D\fR\fImacro\fR[=\fIdefn\fR]...] [\fB\-U\fR\fImacro\fR]

    [\fB\-I\fR\fIdir\fR...] [\fB\-iquote\fR\fIdir\fR...]

    [\fB\-W\fR\fIwarn\fR...]

    [\fB\-M\fR|\fB\-MM\fR] [\fB\-MG\fR] [\fB\-MF\fR \fIfilename\fR]

    [\fB\-MP\fR] [\fB\-MQ\fR \fItarget\fR...]

    [\fB\-MT\fR \fItarget\fR...]

    [\fB\-P\fR] [\fB\-fno\-working\-directory\fR]

    [\fB\-x\fR \fIlanguage\fR] [\fB\-std=\fR\fIstandard\fR]

    \fIinfile\fR \fIoutfile\fR

.PP

Only the most useful options are listed here; see below for the remainder.

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

The C preprocessor, often known as \fIcpp\fR, is a \fImacro processor\fR

that is used automatically by the C compiler to transform your program

before compilation.  It is called a macro processor because it allows

you to define \fImacros\fR, which are brief abbreviations for longer

constructs.

.PP

The C preprocessor is intended to be used only with C, \*(C+, and

Objective-C source code.  In the past, it has been abused as a general

text processor.  It will choke on input which does not obey C's lexical

rules.  For example, apostrophes will be interpreted as the beginning of

character constants, and cause errors.  Also, you cannot rely on it

preserving characteristics of the input which are not significant to

C\-family languages.  If a Makefile is preprocessed, all the hard tabs

will be removed, and the Makefile will not work.

.PP

Having said that, you can often get away with using cpp on things which

are not C.  Other Algol-ish programming languages are often safe

(Pascal, Ada, etc.) So is assembly, with caution.  \fB\-traditional\-cpp\fR

mode preserves more white space, and is otherwise more permissive.  Many

of the problems can be avoided by writing C or \*(C+ style comments

instead of native language comments, and keeping macros simple.

.PP

Wherever possible, you should use a preprocessor geared to the language

you are writing in.  Modern versions of the \s-1GNU\s0 assembler have macro

facilities.  Most high level programming languages have their own

conditional compilation and inclusion mechanism.  If all else fails,

try a true general text processor, such as \s-1GNU\s0 M4.

.PP

C preprocessors vary in some details.  This manual discusses the \s-1GNU\s0 C

preprocessor, which provides a small superset of the features of \s-1ISO\s0

Standard C.  In its default mode, the \s-1GNU\s0 C preprocessor does not do a

few things required by the standard.  These are features which are

rarely, if ever, used, and may cause surprising changes to the meaning

of a program which does not expect them.  To get strict \s-1ISO\s0 Standard C,

you should use the \fB\-std=c90\fR or \fB\-std=c99\fR options, depending

on which version of the standard you want.  To get all the mandatory

diagnostics, you must also use \fB\-pedantic\fR.

.PP

This manual describes the behavior of the \s-1ISO\s0 preprocessor.  To

minimize gratuitous differences, where the \s-1ISO\s0 preprocessor's

behavior does not conflict with traditional semantics, the

traditional preprocessor should behave the same way.  The various

differences that do exist are detailed in the section \fBTraditional

Mode\fR.

.PP

For clarity, unless noted otherwise, references to \fB\s-1CPP\s0\fR in this

manual refer to \s-1GNU\s0 \s-1CPP\s0.

.SH "OPTIONS"

.IX Header "OPTIONS"

The C preprocessor expects two file names as arguments, \fIinfile\fR and

\&\fIoutfile\fR.  The preprocessor reads \fIinfile\fR together with any

other files it specifies with \fB#include\fR.  All the output generated

by the combined input files is written in \fIoutfile\fR.

.PP

Either \fIinfile\fR or \fIoutfile\fR may be \fB\-\fR, which as

\&\fIinfile\fR means to read from standard input and as \fIoutfile\fR

means to write to standard output.  Also, if either file is omitted, it

means the same as if \fB\-\fR had been specified for that file.

.PP

Unless otherwise noted, or the option ends in \fB=\fR, all options

which take an argument may have that argument appear either immediately

after the option, or with a space between option and argument:

\&\fB\-Ifoo\fR and \fB\-I foo\fR have the same effect.

.PP

Many options have multi-letter names; therefore multiple single-letter

options may \fInot\fR be grouped: \fB\-dM\fR is very different from

\&\fB\-d\ \-M\fR.

.IP "\fB\-D\fR \fIname\fR" 4

.IX Item "-D name"

Predefine \fIname\fR as a macro, with definition \f(CW1\fR.

.IP "\fB\-D\fR \fIname\fR\fB=\fR\fIdefinition\fR" 4

.IX Item "-D name=definition"

The contents of \fIdefinition\fR are tokenized and processed as if

they appeared during translation phase three in a \fB#define\fR

directive.  In particular, the definition will be truncated by

embedded newline characters.

.Sp

If you are invoking the preprocessor from a shell or shell-like

program you may need to use the shell's quoting syntax to protect

characters such as spaces that have a meaning in the shell syntax.

.Sp

If you wish to define a function-like macro on the command line, write

its argument list with surrounding parentheses before the equals sign

(if any).  Parentheses are meaningful to most shells, so you will need

to quote the option.  With \fBsh\fR and \fBcsh\fR,

\&\fB\-D'\fR\fIname\fR\fB(\fR\fIargs...\fR\fB)=\fR\fIdefinition\fR\fB'\fR works.

.Sp

\&\fB\-D\fR and \fB\-U\fR options are processed in the order they

are given on the command line.  All \fB\-imacros\fR \fIfile\fR and

\&\fB\-include\fR \fIfile\fR options are processed after all

\&\fB\-D\fR and \fB\-U\fR options.

.IP "\fB\-U\fR \fIname\fR" 4

.IX Item "-U name"

Cancel any previous definition of \fIname\fR, either built in or

provided with a \fB\-D\fR option.

.IP "\fB\-undef\fR" 4

.IX Item "-undef"

Do not predefine any system-specific or GCC-specific macros.  The

standard predefined macros remain defined.

.IP "\fB\-I\fR \fIdir\fR" 4

.IX Item "-I dir"

Add the directory \fIdir\fR to the list of directories to be searched

for header files.

.Sp

Directories named by \fB\-I\fR are searched before the standard

system include directories.  If the directory \fIdir\fR is a standard

system include directory, the option is ignored to ensure that the

default search order for system directories and the special treatment

of system headers are not defeated

\&.

If \fIdir\fR begins with \f(CW\*(C`=\*(C'\fR, then the \f(CW\*(C`=\*(C'\fR will be replaced

by the sysroot prefix; see \fB\-\-sysroot\fR and \fB\-isysroot\fR.

.IP "\fB\-o\fR \fIfile\fR" 4

.IX Item "-o file"

Write output to \fIfile\fR.  This is the same as specifying \fIfile\fR

as the second non-option argument to \fBcpp\fR.  \fBgcc\fR has a

different interpretation of a second non-option argument, so you must

use \fB\-o\fR to specify the output file.

.IP "\fB\-Wall\fR" 4

.IX Item "-Wall"

Turns on all optional warnings which are desirable for normal code.

At present this is \fB\-Wcomment\fR, \fB\-Wtrigraphs\fR,

\&\fB\-Wmultichar\fR and a warning about integer promotion causing a

change of sign in \f(CW\*(C`#if\*(C'\fR expressions.  Note that many of the

preprocessor's warnings are on by default and have no options to

control them.

.IP "\fB\-Wcomment\fR" 4

.IX Item "-Wcomment"

.PD 0

.IP "\fB\-Wcomments\fR" 4

.IX Item "-Wcomments"

.PD

Warn whenever a comment-start sequence \fB/*\fR appears in a \fB/*\fR

comment, or whenever a backslash-newline appears in a \fB//\fR comment.

(Both forms have the same effect.)

.IP "\fB\-Wtrigraphs\fR" 4

.IX Item "-Wtrigraphs"

Most trigraphs in comments cannot affect the meaning of the program.

However, a trigraph that would form an escaped newline (\fB??/\fR at

the end of a line) can, by changing where the comment begins or ends.

Therefore, only trigraphs that would form escaped newlines produce

warnings inside a comment.

.Sp

This option is implied by \fB\-Wall\fR.  If \fB\-Wall\fR is not

given, this option is still enabled unless trigraphs are enabled.  To

get trigraph conversion without warnings, but get the other

\&\fB\-Wall\fR warnings, use \fB\-trigraphs \-Wall \-Wno\-trigraphs\fR.

.IP "\fB\-Wtraditional\fR" 4

.IX Item "-Wtraditional"

Warn about certain constructs that behave differently in traditional and

\&\s-1ISO\s0 C.  Also warn about \s-1ISO\s0 C constructs that have no traditional C

equivalent, and problematic constructs which should be avoided.

.IP "\fB\-Wundef\fR" 4

.IX Item "-Wundef"

Warn whenever an identifier which is not a macro is encountered in an

\&\fB#if\fR directive, outside of \fBdefined\fR.  Such identifiers are

replaced with zero.

.IP "\fB\-Wunused\-macros\fR" 4

.IX Item "-Wunused-macros"

Warn about macros defined in the main file that are unused.  A macro

is \fIused\fR if it is expanded or tested for existence at least once.

The preprocessor will also warn if the macro has not been used at the

time it is redefined or undefined.

.Sp

Built-in macros, macros defined on the command line, and macros

defined in include files are not warned about.

.Sp

\&\fINote:\fR If a macro is actually used, but only used in skipped

conditional blocks, then \s-1CPP\s0 will report it as unused.  To avoid the

warning in such a case, you might improve the scope of the macro's

definition by, for example, moving it into the first skipped block.

Alternatively, you could provide a dummy use with something like:

.Sp

.Vb 2

\&        #if defined the_macro_causing_the_warning

\&        #endif

.Ve

.IP "\fB\-Wendif\-labels\fR" 4

.IX Item "-Wendif-labels"

Warn whenever an \fB#else\fR or an \fB#endif\fR are followed by text.

This usually happens in code of the form

.Sp

.Vb 5

\&        #if FOO

\&        ...

\&        #else FOO

\&        ...

\&        #endif FOO

.Ve

.Sp

The second and third \f(CW\*(C`FOO\*(C'\fR should be in comments, but often are not

in older programs.  This warning is on by default.

.IP "\fB\-Werror\fR" 4

.IX Item "-Werror"

Make all warnings into hard errors.  Source code which triggers warnings

will be rejected.

.IP "\fB\-Wsystem\-headers\fR" 4

.IX Item "-Wsystem-headers"

Issue warnings for code in system headers.  These are normally unhelpful

in finding bugs in your own code, therefore suppressed.  If you are

responsible for the system library, you may want to see them.

.IP "\fB\-w\fR" 4

.IX Item "-w"

Suppress all warnings, including those which \s-1GNU\s0 \s-1CPP\s0 issues by default.

.IP "\fB\-pedantic\fR" 4

.IX Item "-pedantic"

Issue all the mandatory diagnostics listed in the C standard.  Some of

them are left out by default, since they trigger frequently on harmless

code.

.IP "\fB\-pedantic\-errors\fR" 4

.IX Item "-pedantic-errors"

Issue all the mandatory diagnostics, and make all mandatory diagnostics

into errors.  This includes mandatory diagnostics that \s-1GCC\s0 issues

without \fB\-pedantic\fR but treats as warnings.

.IP "\fB\-M\fR" 4

.IX Item "-M"

Instead of outputting the result of preprocessing, output a rule

suitable for \fBmake\fR describing the dependencies of the main

source file.  The preprocessor outputs one \fBmake\fR rule containing

the object file name for that source file, a colon, and the names of all

the included files, including those coming from \fB\-include\fR or

\&\fB\-imacros\fR command line options.

.Sp

Unless specified explicitly (with \fB\-MT\fR or \fB\-MQ\fR), the

object file name consists of the name of the source file with any

suffix replaced with object file suffix and with any leading directory

parts removed.  If there are many included files then the rule is

split into several lines using \fB\e\fR\-newline.  The rule has no

commands.

.Sp

This option does not suppress the preprocessor's debug output, such as

\&\fB\-dM\fR.  To avoid mixing such debug output with the dependency

rules you should explicitly specify the dependency output file with

\&\fB\-MF\fR, or use an environment variable like

\&\fB\s-1DEPENDENCIES_OUTPUT\s0\fR.  Debug output

will still be sent to the regular output stream as normal.

.Sp

Passing \fB\-M\fR to the driver implies \fB\-E\fR, and suppresses

warnings with an implicit \fB\-w\fR.

.IP "\fB\-MM\fR" 4

.IX Item "-MM"

Like \fB\-M\fR but do not mention header files that are found in

system header directories, nor header files that are included,

directly or indirectly, from such a header.

.Sp

This implies that the choice of angle brackets or double quotes in an

\&\fB#include\fR directive does not in itself determine whether that

header will appear in \fB\-MM\fR dependency output.  This is a

slight change in semantics from \s-1GCC\s0 versions 3.0 and earlier.

.IP "\fB\-MF\fR \fIfile\fR" 4

.IX Item "-MF file"

When used with \fB\-M\fR or \fB\-MM\fR, specifies a

file to write the dependencies to.  If no \fB\-MF\fR switch is given

the preprocessor sends the rules to the same place it would have sent

preprocessed output.

.Sp

When used with the driver options \fB\-MD\fR or \fB\-MMD\fR,

\&\fB\-MF\fR overrides the default dependency output file.

.IP "\fB\-MG\fR" 4

.IX Item "-MG"

In conjunction with an option such as \fB\-M\fR requesting

dependency generation, \fB\-MG\fR assumes missing header files are

generated files and adds them to the dependency list without raising

an error.  The dependency filename is taken directly from the

\&\f(CW\*(C`#include\*(C'\fR directive without prepending any path.  \fB\-MG\fR

also suppresses preprocessed output, as a missing header file renders

this useless.

.Sp

This feature is used in automatic updating of makefiles.

.IP "\fB\-MP\fR" 4

.IX Item "-MP"

This option instructs \s-1CPP\s0 to add a phony target for each dependency

other than the main file, causing each to depend on nothing.  These

dummy rules work around errors \fBmake\fR gives if you remove header

files without updating the \fIMakefile\fR to match.

.Sp

This is typical output:

.Sp

.Vb 1

\&        test.o: test.c test.h

\&

\&        test.h:

.Ve

.IP "\fB\-MT\fR \fItarget\fR" 4

.IX Item "-MT target"

Change the target of the rule emitted by dependency generation.  By

default \s-1CPP\s0 takes the name of the main input file, deletes any

directory components and any file suffix such as \fB.c\fR, and

appends the platform's usual object suffix.  The result is the target.

.Sp

An \fB\-MT\fR option will set the target to be exactly the string you

specify.  If you want multiple targets, you can specify them as a single

argument to \fB\-MT\fR, or use multiple \fB\-MT\fR options.

.Sp

For example, \fB\-MT\ '$(objpfx)foo.o'\fR might give

.Sp

.Vb 1

\&        $(objpfx)foo.o: foo.c

.Ve

.IP "\fB\-MQ\fR \fItarget\fR" 4

.IX Item "-MQ target"

Same as \fB\-MT\fR, but it quotes any characters which are special to

Make.  \fB\-MQ\ '$(objpfx)foo.o'\fR gives

.Sp

.Vb 1

\&        $$(objpfx)foo.o: foo.c

.Ve

.Sp

The default target is automatically quoted, as if it were given with

\&\fB\-MQ\fR.

.IP "\fB\-MD\fR" 4

.IX Item "-MD"

\&\fB\-MD\fR is equivalent to \fB\-M \-MF\fR \fIfile\fR, except that

\&\fB\-E\fR is not implied.  The driver determines \fIfile\fR based on

whether an \fB\-o\fR option is given.  If it is, the driver uses its

argument but with a suffix of \fI.d\fR, otherwise it takes the name

of the input file, removes any directory components and suffix, and

applies a \fI.d\fR suffix.

.Sp

If \fB\-MD\fR is used in conjunction with \fB\-E\fR, any

\&\fB\-o\fR switch is understood to specify the dependency output file, but if used without \fB\-E\fR, each \fB\-o\fR

is understood to specify a target object file.

.Sp

Since \fB\-E\fR is not implied, \fB\-MD\fR can be used to generate

a dependency output file as a side-effect of the compilation process.

.IP "\fB\-MMD\fR" 4

.IX Item "-MMD"

Like \fB\-MD\fR except mention only user header files, not system

header files.

.IP "\fB\-x c\fR" 4

.IX Item "-x c"

.PD 0

.IP "\fB\-x c++\fR" 4

.IX Item "-x c++"

.IP "\fB\-x objective-c\fR" 4

.IX Item "-x objective-c"

.IP "\fB\-x assembler-with-cpp\fR" 4

.IX Item "-x assembler-with-cpp"

.PD

Specify the source language: C, \*(C+, Objective-C, or assembly.  This has

nothing to do with standards conformance or extensions; it merely

selects which base syntax to expect.  If you give none of these options,

cpp will deduce the language from the extension of the source file:

\&\fB.c\fR, \fB.cc\fR, \fB.m\fR, or \fB.S\fR.  Some other common

extensions for \*(C+ and assembly are also recognized.  If cpp does not

recognize the extension, it will treat the file as C; this is the most

generic mode.

.Sp

\&\fINote:\fR Previous versions of cpp accepted a \fB\-lang\fR option

which selected both the language and the standards conformance level.

This option has been removed, because it conflicts with the \fB\-l\fR

option.

.IP "\fB\-std=\fR\fIstandard\fR" 4

.IX Item "-std=standard"

.PD 0

.IP "\fB\-ansi\fR" 4

.IX Item "-ansi"

.PD

Specify the standard to which the code should conform.  Currently \s-1CPP\s0

knows about C and \*(C+ standards; others may be added in the future.

.Sp

\&\fIstandard\fR

may be one of:

.RS 4

.ie n .IP """c90""" 4

.el .IP "\f(CWc90\fR" 4

.IX Item "c90"

.PD 0

.ie n .IP """c89""" 4

.el .IP "\f(CWc89\fR" 4

.IX Item "c89"

.ie n .IP """iso9899:1990""" 4

.el .IP "\f(CWiso9899:1990\fR" 4

.IX Item "iso9899:1990"

.PD

The \s-1ISO\s0 C standard from 1990.  \fBc90\fR is the customary shorthand for

this version of the standard.

.Sp

The \fB\-ansi\fR option is equivalent to \fB\-std=c90\fR.

.ie n .IP """iso9899:199409""" 4

.el .IP "\f(CWiso9899:199409\fR" 4

.IX Item "iso9899:199409"

The 1990 C standard, as amended in 1994.

.ie n .IP """iso9899:1999""" 4

.el .IP "\f(CWiso9899:1999\fR" 4

.IX Item "iso9899:1999"

.PD 0

.ie n .IP """c99""" 4

.el .IP "\f(CWc99\fR" 4

.IX Item "c99"

.ie n .IP """iso9899:199x""" 4

.el .IP "\f(CWiso9899:199x\fR" 4

.IX Item "iso9899:199x"

.ie n .IP """c9x""" 4

.el .IP "\f(CWc9x\fR" 4

.IX Item "c9x"

.PD

The revised \s-1ISO\s0 C standard, published in December 1999.  Before

publication, this was known as C9X.

.ie n .IP """gnu90""" 4

.el .IP "\f(CWgnu90\fR" 4

.IX Item "gnu90"

.PD 0

.ie n .IP """gnu89""" 4

.el .IP "\f(CWgnu89\fR" 4

.IX Item "gnu89"

.PD

The 1990 C standard plus \s-1GNU\s0 extensions.  This is the default.

.ie n .IP """gnu99""" 4

.el .IP "\f(CWgnu99\fR" 4

.IX Item "gnu99"

.PD 0

.ie n .IP """gnu9x""" 4

.el .IP "\f(CWgnu9x\fR" 4

.IX Item "gnu9x"

.PD

The 1999 C standard plus \s-1GNU\s0 extensions.

.ie n .IP """c++98""" 4

.el .IP "\f(CWc++98\fR" 4

.IX Item "c++98"

The 1998 \s-1ISO\s0 \*(C+ standard plus amendments.

.ie n .IP """gnu++98""" 4

.el .IP "\f(CWgnu++98\fR" 4

.IX Item "gnu++98"

The same as \fB\-std=c++98\fR plus \s-1GNU\s0 extensions.  This is the

default for \*(C+ code.

.RE

.RS 4

.RE

.IP "\fB\-I\-\fR" 4

.IX Item "-I-"

Split the include path.  Any directories specified with \fB\-I\fR

options before \fB\-I\-\fR are searched only for headers requested with

\&\f(CW\*(C`#include\ "\f(CIfile\f(CW"\*(C'\fR; they are not searched for

\&\f(CW\*(C`#include\ <\f(CIfile\f(CW>\*(C'\fR.  If additional directories are

specified with \fB\-I\fR options after the \fB\-I\-\fR, those

directories are searched for all \fB#include\fR directives.

.Sp

In addition, \fB\-I\-\fR inhibits the use of the directory of the current

file directory as the first search directory for \f(CW\*(C`#include\ "\f(CIfile\f(CW"\*(C'\fR.

.Sp

This option has been deprecated.

.IP "\fB\-nostdinc\fR" 4

.IX Item "-nostdinc"

Do not search the standard system directories for header files.

Only the directories you have specified with \fB\-I\fR options

(and the directory of the current file, if appropriate) are searched.

.IP "\fB\-nostdinc++\fR" 4

.IX Item "-nostdinc++"

Do not search for header files in the \*(C+\-specific standard directories,

but do still search the other standard directories.  (This option is

used when building the \*(C+ library.)

.IP "\fB\-include\fR \fIfile\fR" 4

.IX Item "-include file"

Process \fIfile\fR as if \f(CW\*(C`#include "file"\*(C'\fR appeared as the first

line of the primary source file.  However, the first directory searched

for \fIfile\fR is the preprocessor's working directory \fIinstead of\fR

the directory containing the main source file.  If not found there, it

is searched for in the remainder of the \f(CW\*(C`#include "..."\*(C'\fR search

chain as normal.

.Sp

If multiple \fB\-include\fR options are given, the files are included

in the order they appear on the command line.

.IP "\fB\-imacros\fR \fIfile\fR" 4

.IX Item "-imacros file"

Exactly like \fB\-include\fR, except that any output produced by

scanning \fIfile\fR is thrown away.  Macros it defines remain defined.

This allows you to acquire all the macros from a header without also

processing its declarations.

.Sp

All files specified by \fB\-imacros\fR are processed before all files

specified by \fB\-include\fR.

.IP "\fB\-idirafter\fR \fIdir\fR" 4

.IX Item "-idirafter dir"

Search \fIdir\fR for header files, but do it \fIafter\fR all

directories specified with \fB\-I\fR and the standard system directories

have been exhausted.  \fIdir\fR is treated as a system include directory.

If \fIdir\fR begins with \f(CW\*(C`=\*(C'\fR, then the \f(CW\*(C`=\*(C'\fR will be replaced

by the sysroot prefix; see \fB\-\-sysroot\fR and \fB\-isysroot\fR.

.IP "\fB\-iprefix\fR \fIprefix\fR" 4

.IX Item "-iprefix prefix"

Specify \fIprefix\fR as the prefix for subsequent \fB\-iwithprefix\fR

options.  If the prefix represents a directory, you should include the

final \fB/\fR.

.IP "\fB\-iwithprefix\fR \fIdir\fR" 4

.IX Item "-iwithprefix dir"

.PD 0

.IP "\fB\-iwithprefixbefore\fR \fIdir\fR" 4

.IX Item "-iwithprefixbefore dir"

.PD

Append \fIdir\fR to the prefix specified previously with

\&\fB\-iprefix\fR, and add the resulting directory to the include search

path.  \fB\-iwithprefixbefore\fR puts it in the same place \fB\-I\fR

would; \fB\-iwithprefix\fR puts it where \fB\-idirafter\fR would.

.IP "\fB\-isysroot\fR \fIdir\fR" 4

.IX Item "-isysroot dir"

This option is like the \fB\-\-sysroot\fR option, but applies only to

header files.  See the \fB\-\-sysroot\fR option for more information.

.IP "\fB\-imultilib\fR \fIdir\fR" 4

.IX Item "-imultilib dir"

Use \fIdir\fR as a subdirectory of the directory containing

target-specific \*(C+ headers.

.IP "\fB\-isystem\fR \fIdir\fR" 4

.IX Item "-isystem dir"

Search \fIdir\fR for header files, after all directories specified by

\&\fB\-I\fR but before the standard system directories.  Mark it

as a system directory, so that it gets the same special treatment as

is applied to the standard system directories.

.Sp

If \fIdir\fR begins with \f(CW\*(C`=\*(C'\fR, then the \f(CW\*(C`=\*(C'\fR will be replaced

by the sysroot prefix; see \fB\-\-sysroot\fR and \fB\-isysroot\fR.

.IP "\fB\-iquote\fR \fIdir\fR" 4

.IX Item "-iquote dir"

Search \fIdir\fR only for header files requested with

\&\f(CW\*(C`#include\ "\f(CIfile\f(CW"\*(C'\fR; they are not searched for

\&\f(CW\*(C`#include\ <\f(CIfile\f(CW>\*(C'\fR, before all directories specified by

\&\fB\-I\fR and before the standard system directories.

.Sp

If \fIdir\fR begins with \f(CW\*(C`=\*(C'\fR, then the \f(CW\*(C`=\*(C'\fR will be replaced

by the sysroot prefix; see \fB\-\-sysroot\fR and \fB\-isysroot\fR.

.IP "\fB\-fdirectives\-only\fR" 4

.IX Item "-fdirectives-only"

When preprocessing, handle directives, but do not expand macros.

.Sp

The option's behavior depends on the \fB\-E\fR and \fB\-fpreprocessed\fR

options.

.Sp

With \fB\-E\fR, preprocessing is limited to the handling of directives

such as \f(CW\*(C`#define\*(C'\fR, \f(CW\*(C`#ifdef\*(C'\fR, and \f(CW\*(C`#error\*(C'\fR.  Other

preprocessor operations, such as macro expansion and trigraph

conversion are not performed.  In addition, the \fB\-dD\fR option is

implicitly enabled.

.Sp

With \fB\-fpreprocessed\fR, predefinition of command line and most

builtin macros is disabled.  Macros such as \f(CW\*(C`_\|_LINE_\|_\*(C'\fR, which are

contextually dependent, are handled normally.  This enables compilation of

files previously preprocessed with \f(CW\*(C`\-E \-fdirectives\-only\*(C'\fR.

.Sp

With both \fB\-E\fR and \fB\-fpreprocessed\fR, the rules for

\&\fB\-fpreprocessed\fR take precedence.  This enables full preprocessing of

files previously preprocessed with \f(CW\*(C`\-E \-fdirectives\-only\*(C'\fR.

.IP "\fB\-fdollars\-in\-identifiers\fR" 4

.IX Item "-fdollars-in-identifiers"

Accept \fB$\fR in identifiers.

.IP "\fB\-fextended\-identifiers\fR" 4

.IX Item "-fextended-identifiers"

Accept universal character names in identifiers.  This option is

experimental; in a future version of \s-1GCC\s0, it will be enabled by

default for C99 and \*(C+.

.IP "\fB\-fpreprocessed\fR" 4

.IX Item "-fpreprocessed"

Indicate to the preprocessor that the input file has already been

preprocessed.  This suppresses things like macro expansion, trigraph

conversion, escaped newline splicing, and processing of most directives.

The preprocessor still recognizes and removes comments, so that you can

pass a file preprocessed with \fB\-C\fR to the compiler without

problems.  In this mode the integrated preprocessor is little more than

a tokenizer for the front ends.

.Sp

\&\fB\-fpreprocessed\fR is implicit if the input file has one of the

extensions \fB.i\fR, \fB.ii\fR or \fB.mi\fR.  These are the

extensions that \s-1GCC\s0 uses for preprocessed files created by

\&\fB\-save\-temps\fR.

.IP "\fB\-ftabstop=\fR\fIwidth\fR" 4

.IX Item "-ftabstop=width"

Set the distance between tab stops.  This helps the preprocessor report

correct column numbers in warnings or errors, even if tabs appear on the

line.  If the value is less than 1 or greater than 100, the option is

ignored.  The default is 8.

.IP "\fB\-fexec\-charset=\fR\fIcharset\fR" 4

.IX Item "-fexec-charset=charset"

Set the execution character set, used for string and character

constants.  The default is \s-1UTF\-8\s0.  \fIcharset\fR can be any encoding

supported by the system's \f(CW\*(C`iconv\*(C'\fR library routine.

.IP "\fB\-fwide\-exec\-charset=\fR\fIcharset\fR" 4

.IX Item "-fwide-exec-charset=charset"

Set the wide execution character set, used for wide string and

character constants.  The default is \s-1UTF\-32\s0 or \s-1UTF\-16\s0, whichever

corresponds to the width of \f(CW\*(C`wchar_t\*(C'\fR.  As with

\&\fB\-fexec\-charset\fR, \fIcharset\fR can be any encoding supported

by the system's \f(CW\*(C`iconv\*(C'\fR library routine; however, you will have

problems with encodings that do not fit exactly in \f(CW\*(C`wchar_t\*(C'\fR.

.IP "\fB\-finput\-charset=\fR\fIcharset\fR" 4

.IX Item "-finput-charset=charset"

Set the input character set, used for translation from the character

set of the input file to the source character set used by \s-1GCC\s0.  If the

locale does not specify, or \s-1GCC\s0 cannot get this information from the

locale, the default is \s-1UTF\-8\s0.  This can be overridden by either the locale

or this command line option.  Currently the command line option takes

precedence if there's a conflict.  \fIcharset\fR can be any encoding

supported by the system's \f(CW\*(C`iconv\*(C'\fR library routine.

.IP "\fB\-fworking\-directory\fR" 4

.IX Item "-fworking-directory"

Enable generation of linemarkers in the preprocessor output that will

let the compiler know the current working directory at the time of

preprocessing.  When this option is enabled, the preprocessor will

emit, after the initial linemarker, a second linemarker with the

current working directory followed by two slashes.  \s-1GCC\s0 will use this

directory, when it's present in the preprocessed input, as the

directory emitted as the current working directory in some debugging

information formats.  This option is implicitly enabled if debugging

information is enabled, but this can be inhibited with the negated

form \fB\-fno\-working\-directory\fR.  If the \fB\-P\fR flag is

present in the command line, this option has no effect, since no

\&\f(CW\*(C`#line\*(C'\fR directives are emitted whatsoever.

.IP "\fB\-fno\-show\-column\fR" 4

.IX Item "-fno-show-column"

Do not print column numbers in diagnostics.  This may be necessary if

diagnostics are being scanned by a program that does not understand the

column numbers, such as \fBdejagnu\fR.

.IP "\fB\-A\fR \fIpredicate\fR\fB=\fR\fIanswer\fR" 4

.IX Item "-A predicate=answer"

Make an assertion with the predicate \fIpredicate\fR and answer

\&\fIanswer\fR.  This form is preferred to the older form \fB\-A\fR

\&\fIpredicate\fR\fB(\fR\fIanswer\fR\fB)\fR, which is still supported, because

it does not use shell special characters.

.IP "\fB\-A \-\fR\fIpredicate\fR\fB=\fR\fIanswer\fR" 4

.IX Item "-A -predicate=answer"

Cancel an assertion with the predicate \fIpredicate\fR and answer

\&\fIanswer\fR.

.IP "\fB\-dCHARS\fR" 4

.IX Item "-dCHARS"

\&\fI\s-1CHARS\s0\fR is a sequence of one or more of the following characters,

and must not be preceded by a space.  Other characters are interpreted

by the compiler proper, or reserved for future versions of \s-1GCC\s0, and so

are silently ignored.  If you specify characters whose behavior

conflicts, the result is undefined.

.RS 4

.IP "\fBM\fR" 4

.IX Item "M"

Instead of the normal output, generate a list of \fB#define\fR

directives for all the macros defined during the execution of the

preprocessor, including predefined macros.  This gives you a way of

finding out what is predefined in your version of the preprocessor.

Assuming you have no file \fIfoo.h\fR, the command

.Sp

.Vb 1

\&        touch foo.h; cpp \-dM foo.h

.Ve

.Sp

will show all the predefined macros.

.Sp

If you use \fB\-dM\fR without the \fB\-E\fR option, \fB\-dM\fR is

interpreted as a synonym for \fB\-fdump\-rtl\-mach\fR.

.IP "\fBD\fR" 4

.IX Item "D"

Like \fBM\fR except in two respects: it does \fInot\fR include the

predefined macros, and it outputs \fIboth\fR the \fB#define\fR

directives and the result of preprocessing.  Both kinds of output go to

the standard output file.

.IP "\fBN\fR" 4

.IX Item "N"

Like \fBD\fR, but emit only the macro names, not their expansions.

.IP "\fBI\fR" 4

.IX Item "I"

Output \fB#include\fR directives in addition to the result of

preprocessing.

.IP "\fBU\fR" 4

.IX Item "U"

Like \fBD\fR except that only macros that are expanded, or whose

definedness is tested in preprocessor directives, are output; the

output is delayed until the use or test of the macro; and

\&\fB#undef\fR directives are also output for macros tested but

undefined at the time.

.RE

.RS 4

.RE

.IP "\fB\-P\fR" 4

.IX Item "-P"

Inhibit generation of linemarkers in the output from the preprocessor.

This might be useful when running the preprocessor on something that is

not C code, and will be sent to a program which might be confused by the

linemarkers.

.IP "\fB\-C\fR" 4

.IX Item "-C"

Do not discard comments.  All comments are passed through to the output

file, except for comments in processed directives, which are deleted

along with the directive.

.Sp

You should be prepared for side effects when using \fB\-C\fR; it

causes the preprocessor to treat comments as tokens in their own right.

For example, comments appearing at the start of what would be a

directive line have the effect of turning that line into an ordinary

source line, since the first token on the line is no longer a \fB#\fR.

.IP "\fB\-CC\fR" 4

.IX Item "-CC"

Do not discard comments, including during macro expansion.  This is

like \fB\-C\fR, except that comments contained within macros are

also passed through to the output file where the macro is expanded.

.Sp

In addition to the side-effects of the \fB\-C\fR option, the

\&\fB\-CC\fR option causes all \*(C+\-style comments inside a macro

to be converted to C\-style comments.  This is to prevent later use

of that macro from inadvertently commenting out the remainder of

the source line.

.Sp

The \fB\-CC\fR option is generally used to support lint comments.

.IP "\fB\-traditional\-cpp\fR" 4

.IX Item "-traditional-cpp"

Try to imitate the behavior of old-fashioned C preprocessors, as

opposed to \s-1ISO\s0 C preprocessors.

.IP "\fB\-trigraphs\fR" 4

.IX Item "-trigraphs"

Process trigraph sequences.

.IP "\fB\-remap\fR" 4

.IX Item "-remap"

Enable special code to work around file systems which only permit very

short file names, such as MS-DOS.

.IP "\fB\-\-help\fR" 4

.IX Item "--help"

.PD 0

.IP "\fB\-\-target\-help\fR" 4

.IX Item "--target-help"

.PD

Print text describing all the command line options instead of

preprocessing anything.

.IP "\fB\-v\fR" 4

.IX Item "-v"

Verbose mode.  Print out \s-1GNU\s0 \s-1CPP\s0's version number at the beginning of

execution, and report the final form of the include path.

.IP "\fB\-H\fR" 4

.IX Item "-H"

Print the name of each header file used, in addition to other normal

activities.  Each name is indented to show how deep in the

\&\fB#include\fR stack it is.  Precompiled header files are also

printed, even if they are found to be invalid; an invalid precompiled

header file is printed with \fB...x\fR and a valid one with \fB...!\fR .

.IP "\fB\-version\fR" 4

.IX Item "-version"

.PD 0

.IP "\fB\-\-version\fR" 4

.IX Item "--version"

.PD

Print out \s-1GNU\s0 \s-1CPP\s0's version number.  With one dash, proceed to

preprocess as normal.  With two dashes, exit immediately.

.SH "ENVIRONMENT"

.IX Header "ENVIRONMENT"

This section describes the environment variables that affect how \s-1CPP\s0

operates.  You can use them to specify directories or prefixes to use

when searching for include files, or to control dependency output.

.PP

Note that you can also specify places to search using options such as

\&\fB\-I\fR, and control dependency output with options like

\&\fB\-M\fR.  These take precedence over

environment variables, which in turn take precedence over the

configuration of \s-1GCC\s0.

.IP "\fB\s-1CPATH\s0\fR" 4

.IX Item "CPATH"

.PD 0

.IP "\fBC_INCLUDE_PATH\fR" 4

.IX Item "C_INCLUDE_PATH"

.IP "\fB\s-1CPLUS_INCLUDE_PATH\s0\fR" 4

.IX Item "CPLUS_INCLUDE_PATH"

.IP "\fB\s-1OBJC_INCLUDE_PATH\s0\fR" 4

.IX Item "OBJC_INCLUDE_PATH"

.PD

Each variable's value is a list of directories separated by a special

character, much like \fB\s-1PATH\s0\fR, in which to look for header files.

The special character, \f(CW\*(C`PATH_SEPARATOR\*(C'\fR, is target-dependent and

determined at \s-1GCC\s0 build time.  For Microsoft Windows-based targets it is a

semicolon, and for almost all other targets it is a colon.

.Sp

\&\fB\s-1CPATH\s0\fR specifies a list of directories to be searched as if

specified with \fB\-I\fR, but after any paths given with \fB\-I\fR

options on the command line.  This environment variable is used

regardless of which language is being preprocessed.

.Sp

The remaining environment variables apply only when preprocessing the

particular language indicated.  Each specifies a list of directories

to be searched as if specified with \fB\-isystem\fR, but after any

paths given with \fB\-isystem\fR options on the command line.

.Sp

In all these variables, an empty element instructs the compiler to

search its current working directory.  Empty elements can appear at the

beginning or end of a path.  For instance, if the value of

\&\fB\s-1CPATH\s0\fR is \f(CW\*(C`:/special/include\*(C'\fR, that has the same

effect as \fB\-I.\ \-I/special/include\fR.

.IP "\fB\s-1DEPENDENCIES_OUTPUT\s0\fR" 4

.IX Item "DEPENDENCIES_OUTPUT"

If this variable is set, its value specifies how to output

dependencies for Make based on the non-system header files processed

by the compiler.  System header files are ignored in the dependency

output.