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   128 .rm #[ #] #H #V #F C

   129 .\" ========================================================================

   130 .\"

   131 .IX Title "CPP 1"

   132 .TH CPP 1 "2004-11-05" "gcc-3.4.3" "GNU"

   133 .SH "NAME"

   134 cpp \- The C Preprocessor

   135 .SH "SYNOPSIS"

   136 .IX Header "SYNOPSIS"

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

   138     [\fB\-I\fR\fIdir\fR...] [\fB\-W\fR\fIwarn\fR...]

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

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

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

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

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

   144     \fIinfile\fR \fIoutfile\fR

   145 .PP

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

   147 .SH "DESCRIPTION"

   148 .IX Header "DESCRIPTION"

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

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

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

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

   153 constructs.

   154 .PP

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

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

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

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

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

   160 preserving characteristics of the input which are not significant to

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

   162 will be removed, and the Makefile will not work.

   163 .PP

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

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

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

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

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

   169 instead of native language comments, and keeping macros simple.

   170 .PP

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

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

   173 facilities.  Most high level programming languages have their own

   174 conditional compilation and inclusion mechanism.  If all else fails,

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

   176 .PP

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

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

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

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

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

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

   183 you should use the \fB\-std=c89\fR or \fB\-std=c99\fR options, depending

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

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

   186 .PP

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

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

   189 behavior does not conflict with traditional semantics, the

   190 traditional preprocessor should behave the same way.  The various

   191 differences that do exist are detailed in the section \fBTraditional

   192 Mode\fR.

   193 .PP

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

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

   196 .SH "OPTIONS"

   197 .IX Header "OPTIONS"

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

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

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

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

   202 .PP

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

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

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

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

   207 .PP

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

   209 which take an argument may have that argument appear either immediately

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

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

   212 .PP

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

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

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

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

   217 .IX Item "-D name"

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

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

   220 .IX Item "-D name=definition"

   221 Predefine \fIname\fR as a macro, with definition \fIdefinition\fR.

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

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

   224 directive.  In particular, the definition will be truncated by

   225 embedded newline characters.

   226 .Sp

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

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

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

   230 .Sp

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

   232 its argument list with surrounding parentheses before the equals sign

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

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

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

   236 .Sp

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

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

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

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

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

   242 .IX Item "-U name"

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

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

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

   246 .IX Item "-undef"

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

   248 standard predefined macros remain defined.

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

   250 .IX Item "-I dir"

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

   252 for header files.

   253 .Sp

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

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

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

   257 default search order for system directories and the special treatment

   258 of system headers are not defeated

   259 \&.

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

   261 .IX Item "-o file"

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

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

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

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

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

   267 .IX Item "-Wall"

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

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

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

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

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

   273 control them.

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

   275 .IX Item "-Wcomment"

   276 .PD 0

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

   278 .IX Item "-Wcomments"

   279 .PD

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

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

   282 (Both forms have the same effect.)

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

   284 .IX Item "-Wtrigraphs"

   285 @anchor{Wtrigraphs}

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

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

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

   289 Therefore, only trigraphs that would form escaped newlines produce

   290 warnings inside a comment.

   291 .Sp

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

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

   294 get trigraph conversion without warnings, but get the other

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

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

   297 .IX Item "-Wtraditional"

   298 Warn about certain constructs that behave differently in traditional and

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

   300 equivalent, and problematic constructs which should be avoided.

   301 .IP "\fB\-Wimport\fR" 4

   302 .IX Item "-Wimport"

   303 Warn the first time \fB#import\fR is used.

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

   305 .IX Item "-Wundef"

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

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

   308 replaced with zero.

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

   310 .IX Item "-Wunused-macros"

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

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

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

   314 time it is redefined or undefined.

   315 .Sp

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

   317 defined in include files are not warned about.

   318 .Sp

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

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

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

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

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

   324 .Sp

   325 .Vb 2

   326 \&        #if defined the_macro_causing_the_warning

   327 \&        #endif

   328 .Ve

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

   330 .IX Item "-Wendif-labels"

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

   332 This usually happens in code of the form

   333 .Sp

   334 .Vb 5

   335 \&        #if FOO

   336 \&        ...

   337 \&        #else FOO

   338 \&        ...

   339 \&        #endif FOO

   340 .Ve

   341 .Sp

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

   343 in older programs.  This warning is on by default.

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

   345 .IX Item "-Werror"

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

   347 will be rejected.

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

   349 .IX Item "-Wsystem-headers"

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

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

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

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

   354 .IX Item "-w"

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

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

   357 .IX Item "-pedantic"

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

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

   360 code.

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

   362 .IX Item "-pedantic-errors"

   363 Issue all the mandatory diagnostics, and make all mandatory diagnostics

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

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

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

   367 .IX Item "-M"

   368 Instead of outputting the result of preprocessing, output a rule

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

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

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

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

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

   374 .Sp

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

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

   377 suffix replaced with object file suffix.  If there are many included

   378 files then the rule is split into several lines using \fB\e\fR\-newline.

   379 The rule has no commands.

   380 .Sp

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

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

   383 rules you should explicitly specify the dependency output file with

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

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

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

   387 .Sp

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

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

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

   391 .IX Item "-MM"

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

   393 system header directories, nor header files that are included,

   394 directly or indirectly, from such a header.

   395 .Sp

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

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

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

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

   400 .Sp

   401 @anchor{dashMF}

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

   403 .IX Item "-MF file"

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

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

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

   407 preprocessed output.

   408 .Sp

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

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

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

   412 .IX Item "-MG"

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

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

   415 generated files and adds them to the dependency list without raising

   416 an error.  The dependency filename is taken directly from the

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

   418 also suppresses preprocessed output, as a missing header file renders

   419 this useless.

   420 .Sp

   421 This feature is used in automatic updating of makefiles.

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

   423 .IX Item "-MP"

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

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

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

   427 files without updating the \fIMakefile\fR to match.

   428 .Sp

   429 This is typical output:

   430 .Sp

   431 .Vb 1

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

   433 .Ve

   434 .Sp

   435 .Vb 1

   436 \&        test.h:

   437 .Ve

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

   439 .IX Item "-MT target"

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

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

   442 deletes any file suffix such as \fB.c\fR, and appends the platform's

   443 usual object suffix.  The result is the target.

   444 .Sp

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

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

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

   448 .Sp

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

   450 .Sp

   451 .Vb 1

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

   453 .Ve

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

   455 .IX Item "-MQ target"

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

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

   458 .Sp

   459 .Vb 1

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

   461 .Ve

   462 .Sp

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

   464 \&\fB\-MQ\fR.

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

   466 .IX Item "-MD"

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

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

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

   470 argument but with a suffix of \fI.d\fR, otherwise it take the

   471 basename of the input file and applies a \fI.d\fR suffix.

   472 .Sp

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

   474 \&\fB\-o\fR switch is understood to specify the dependency output file

   475 (but \f(CW@pxref\fR{dashMF,,\-MF}), but if used without \fB\-E\fR, each \fB\-o\fR

   476 is understood to specify a target object file.

   477 .Sp

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

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

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

   481 .IX Item "-MMD"

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

   483 \&\-header files.

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

   485 .IX Item "-x c"

   486 .PD 0

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

   488 .IX Item "-x c++"

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

   490 .IX Item "-x objective-c"

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

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

   493 .PD

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

   495 nothing to do with standards conformance or extensions; it merely

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

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

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

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

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

   501 generic mode.

   502 .Sp

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

   504 which selected both the language and the standards conformance level.

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

   506 option.

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

   508 .IX Item "-std=standard"

   509 .PD 0

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

   511 .IX Item "-ansi"

   512 .PD

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

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

   515 .Sp

   516 \&\fIstandard\fR

   517 may be one of:

   518 .RS 4

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

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

   521 .IX Item "iso9899:1990"

   522 .PD 0

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

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

   525 .IX Item "c89"

   526 .PD

   527 The \s-1ISO\s0 C standard from 1990.  \fBc89\fR is the customary shorthand for

   528 this version of the standard.

   529 .Sp

   530 The \fB\-ansi\fR option is equivalent to \fB\-std=c89\fR.

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

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

   533 .IX Item "iso9899:199409"

   534 The 1990 C standard, as amended in 1994.

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

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

   537 .IX Item "iso9899:1999"

   538 .PD 0

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

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

   541 .IX Item "c99"

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

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

   544 .IX Item "iso9899:199x"

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

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

   547 .IX Item "c9x"

   548 .PD

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

   550 publication, this was known as C9X.

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

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

   553 .IX Item "gnu89"

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

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

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

   557 .IX Item "gnu99"

   558 .PD 0

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

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

   561 .IX Item "gnu9x"

   562 .PD

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

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

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

   566 .IX Item "c++98"

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

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

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

   570 .IX Item "gnu++98"

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

   572 default for \*(C+ code.

   573 .RE

   574 .RS 4

   575 .RE

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

   577 .IX Item "-I-"

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

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

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

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

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

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

   584 .Sp

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

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

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

   588 .IX Item "-nostdinc"

   589 Do not search the standard system directories for header files.

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

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

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

   593 .IX Item "-nostdinc++"

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

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

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

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

   598 .IX Item "-include file"

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

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

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

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

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

   604 chain as normal.

   605 .Sp

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

   607 in the order they appear on the command line.

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

   609 .IX Item "-imacros file"

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

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

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

   613 processing its declarations.

   614 .Sp

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

   616 specified by \fB\-include\fR.

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

   618 .IX Item "-idirafter dir"

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

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

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

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

   623 .IX Item "-iprefix prefix"

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

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

   626 final \fB/\fR.

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

   628 .IX Item "-iwithprefix dir"

   629 .PD 0

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

   631 .IX Item "-iwithprefixbefore dir"

   632 .PD

   633 Append \fIdir\fR to the prefix specified previously with

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

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

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

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

   638 .IX Item "-isystem dir"

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

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

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

   642 is applied to the standard system directories.

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

   644 .IX Item "-fdollars-in-identifiers"

   645 @anchor{fdollars\-in\-identifiers}

   646 Accept \fB$\fR in identifiers.

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

   648 .IX Item "-fpreprocessed"

   649 Indicate to the preprocessor that the input file has already been

   650 preprocessed.  This suppresses things like macro expansion, trigraph

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

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

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

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

   655 a tokenizer for the front ends.

   656 .Sp

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

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

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

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

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

   662 .IX Item "-ftabstop=width"

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

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

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

   666 ignored.  The default is 8.

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

   668 .IX Item "-fexec-charset=charset"

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

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

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

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

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

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

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

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

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

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

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

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

   681 .IX Item "-finput-charset=charset"

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

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

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

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

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

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

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

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

   690 .IX Item "-fworking-directory"

   691 Enable generation of linemarkers in the preprocessor output that will

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

   693 preprocessing.  When this option is enabled, the preprocessor will

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

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

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

   697 directory emitted as the current working directory in some debugging

   698 information formats.  This option is implicitly enabled if debugging

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

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

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

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

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

   704 .IX Item "-fno-show-column"

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

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

   707 column numbers, such as \fBdejagnu\fR.

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

   709 .IX Item "-A predicate=answer"

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

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

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

   713 it does not use shell special characters.

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

   715 .IX Item "-A -predicate=answer"

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

   717 \&\fIanswer\fR.

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

   719 .IX Item "-dCHARS"

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

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

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

   723 are silently ignored.  If you specify characters whose behavior

   724 conflicts, the result is undefined.

   725 .RS 4

   726 .IP "\fBM\fR" 4

   727 .IX Item "M"

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

   729 directives for all the macros defined during the execution of the

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

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

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

   733 .Sp

   734 .Vb 1

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

   736 .Ve

   737 .Sp

   738 will show all the predefined macros.

   739 .IP "\fBD\fR" 4

   740 .IX Item "D"

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

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

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

   744 the standard output file.

   745 .IP "\fBN\fR" 4

   746 .IX Item "N"

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

   748 .IP "\fBI\fR" 4

   749 .IX Item "I"

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

   751 preprocessing.

   752 .RE

   753 .RS 4

   754 .RE

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

   756 .IX Item "-P"

   757 Inhibit generation of linemarkers in the output from the preprocessor.

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

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

   760 linemarkers.

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

   762 .IX Item "-C"

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

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

   765 along with the directive.

   766 .Sp

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

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

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

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

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

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

   773 .IX Item "-CC"

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

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

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

   777 .Sp

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

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

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

   781 of that macro from inadvertently commenting out the remainder of

   782 the source line.

   783 .Sp

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

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

   786 .IX Item "-traditional-cpp"

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

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

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

   790 .IX Item "-trigraphs"

   791 Process trigraph sequences.

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

   793 .IX Item "-remap"

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

   795 short file names, such as \s-1MS\-DOS\s0.

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

   797 .IX Item "--help"

   798 .PD 0

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

   800 .IX Item "--target-help"

   801 .PD

   802 Print text describing all the command line options instead of

   803 preprocessing anything.

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

   805 .IX Item "-v"

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

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

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

   809 .IX Item "-H"

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

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

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

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

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

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

   816 .IX Item "-version"

   817 .PD 0

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

   819 .IX Item "--version"

   820 .PD

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

   822 preprocess as normal.  With two dashes, exit immediately.

   823 .SH "ENVIRONMENT"

   824 .IX Header "ENVIRONMENT"

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

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

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

   828 .PP

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

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

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

   832 environment variables, which in turn take precedence over the

   833 configuration of \s-1GCC\s0.

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

   835 .IX Item "CPATH"

   836 .PD 0

   837 .IP "\fBC_INCLUDE_PATH\fR" 4

   838 .IX Item "C_INCLUDE_PATH"

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

   840 .IX Item "CPLUS_INCLUDE_PATH"

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

   842 .IX Item "OBJC_INCLUDE_PATH"

   843 .PD

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

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

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

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

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

   849 .Sp

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

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

   852 options on the command line.  This environment variable is used

   853 regardless of which language is being preprocessed.

   854 .Sp

   855 The remaining environment variables apply only when preprocessing the

   856 particular language indicated.  Each specifies a list of directories

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

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

   859 .Sp

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

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

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

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

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

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

   866 .IX Item "DEPENDENCIES_OUTPUT"

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

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

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

   870 output.

   871 .Sp

   872 The value of \fB\s-1DEPENDENCIES_OUTPUT\s0\fR can be just a file name, in

   873 which case the Make rules are written to that file, guessing the target

   874 name from the source file name.  Or the value can have the form

   875 \&\fIfile\fR\fB \fR\fItarget\fR, in which case the rules are written to

   876 file \fIfile\fR using \fItarget\fR as the target name.

   877 .Sp

   878 In other words, this environment variable is equivalent to combining

   879 the options \fB\-MM\fR and \fB\-MF\fR,

   880 with an optional \fB\-MT\fR switch too.

   881 .IP "\fB\s-1SUNPRO_DEPENDENCIES\s0\fR" 4

   882 .IX Item "SUNPRO_DEPENDENCIES"

   883 This variable is the same as \fB\s-1DEPENDENCIES_OUTPUT\s0\fR (see above),

   884 except that system header files are not ignored, so it implies

   885 \&\fB\-M\fR rather than \fB\-MM\fR.  However, the dependence on the

   886 main input file is omitted.

   887 .SH "SEE ALSO"

   888 .IX Header "SEE ALSO"

   889 \&\fIgpl\fR\|(7), \fIgfdl\fR\|(7), \fIfsf\-funding\fR\|(7),

   890 \&\fIgcc\fR\|(1), \fIas\fR\|(1), \fIld\fR\|(1), and the Info entries for \fIcpp\fR, \fIgcc\fR, and

   891 \&\fIbinutils\fR.

   892 .SH "COPYRIGHT"

   893 .IX Header "COPYRIGHT"

   894 Copyright (c) 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,

   895 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

   896 Free Software Foundation, Inc.

   897 .PP

   898 Permission is granted to copy, distribute and/or modify this document

   899 under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.1 or

   900 any later version published by the Free Software Foundation.  A copy of

   901 the license is included in the

   902 man page \fIgfdl\fR\|(7).

   903 This manual contains no Invariant Sections.  The Front-Cover Texts are

   904 (a) (see below), and the Back-Cover Texts are (b) (see below).

   905 .PP

   906 (a) The \s-1FSF\s0's Front-Cover Text is:

   907 .PP

   908 .Vb 1

   909 \&     A GNU Manual

   910 .Ve

   911 .PP

   912 (b) The \s-1FSF\s0's Back-Cover Text is:

   913 .PP

   914 .Vb 3

   915 \&     You have freedom to copy and modify this GNU Manual, like GNU

   916 \&     software.  Copies published by the Free Software Foundation raise

   917 \&     funds for GNU development.

   918 .Ve