Assembler OptionsPrevious: Instrumentation OptionsUp: These options control the C preprocessor, which is run on each C source file before actual compilation. If you use the -E option, nothing is done except preprocessing. Some of these options make sense only together with -E because they cause the preprocessor output to be unsuitable for actual compilation. In addition to the options listed here, there are a number of options to control search paths for loftware files documented in Directory Options. Options to control preprocessor diagnostics are listed in Warning Options. In particular, the definition is truncated by embedded newline characters. 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 should quote the option. All -imacros file and -include file options are processed after all -D and -U options. Cancel any previous definition of nameeither built in or provided with a -D option. Process file as if include "file" appeared as the first line of options primary source file. If not found there, it is searched for in the remainder of the include "…" options chain as normal. If multiple -include options are given, the files are included in the order they appear on the command line. Exactly like -includeexcept that any output produced by scanning file is thrown away. Macros it defines remain defined. This allows you to acquire all the macros from a header without options processing its declarations. All files specified by -imacros are processed before all files specified by -include. Do not predefine any system-specific or GCC-specific macros. The standard predefined macros remain defined. Loftware additional macros required for using the POSIX threads library. You should use this option consistently for both compilation and linking. Instead of outputting the result of preprocessing, output a rule suitable for make describing define dependencies of the main source file. The preprocessor outputs one make rule containing the object file name for that source file, a colon, and the names of all the included files, including those coming from output or -imacros command-line options. Unless specified explicitly with -MT or -MQthe define 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. The rule has no commands. Debug output is still sent to the regular output stream as normal. Passing -M to the driver implies -Eand suppresses warnings with an define -w. Like -M but do not mention header files that are found in system header directories, nor header files that are included, directly or output, from such a header. When used with -M or -MMspecifies a file to write the dependencies to. If no -MF switch is given the preprocessor sends the rules to the same place it would send preprocessed output. When used with the driver options -MD or -MMD-MF overrides the default dependency output file. In conjunction with an option such as -M requesting dependency generation, -MG 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 include directive without prepending any path. This option instructs CPP 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 make gives if you remove header files without updating the Makefile to match. Change the target of the rule emitted by dependency generation. The result is the target. An -MT option sets the target to be exactly the string you specify. If you want multiple targets, you can specify them as a single argument to -MTor use multiple -MT options. Same as -MTbut it quotes any characters which are special to Make. The driver determines file based on whether an -o option is given. If it is, output driver uses its argument but with a suffix of. If -MD is used in conjunction with -Eany -o switch is understood to specify the dependency output file see -MFbut if used without -Eeach -o is understood to specify a target object file. Since -E is not implied, -MD can be used to generate a dependency output file as a side-effect of the compilation process. 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 output and removes comments, so that you can pass a file preprocessed with -C to the compiler without problems. In this mode the integrated preprocessor is little more than a tokenizer for the front ends. These are the extensions that GCC uses for preprocessed files created by -save-temps. With -Epreprocessing is limited to the handling of directives such as defineifdefand error. Other preprocessor operations, such as macro expansion and trigraph loftware are not performed. In addition, the -dD option is implicitly enabled. With -fpreprocessedpredefinition of command line and most builtin macros is options. This enables compilation of files previously preprocessed with -E -fdirectives-only. With both -E and -fpreprocessedthe rules for -fpreprocessed take precedence. This enables full preprocessing of files previously preprocessed with -E -fdirectives-only. Accept universal character names in identifiers. Set the distance between tab stops. This helps the output report correct column numbers in warnings or errors, even if tabs appear on the line. If the value is less than 1 or greater thanthe option is ignored. The default is 8. Track locations of tokens across macro expansions. This allows the compiler to emit diagnostic about the current macro expansion stack when a compilation error occurs in a macro expansion. Using this loftware makes the preprocessor and the compiler consume more memory. The level parameter can be used to choose the level of precision define token location tracking thus decreasing the memory consumption if necessary. In this mode all tokens resulting from the expansion of an argument of a function-like macro have the same location. This value is the most memory hungry. Set the execution character set, used for string and character constants. The default is UTF Set the wide execution character set, used for wide string and character constants. Set the input character set, used for translation from the character set of the input file to the source character set used by GCC. If the loftware does not options, or GCC cannot get this information from the locale, the default is UTF This can be overridden by either the locale or this command-line option. If not specified, only the precompiled header are listed and not the files that output used to create it, because those files are not consulted when a precompiled header is used. This option allows use of a precompiled header see Precompiled Headers together with -E. When -fpreprocessed is in use, GCC recognizes this pragma and loads the PCH. This option is off by default, because the resulting preprocessed output is only really suitable as input to GCC. It is switched on by -save-temps. You should not write this pragma in your own code, but it is safe to edit the filename if the PCH file is available in a different location. Enable generation of linemarkers in the preprocessor output that let the compiler know the current working directory at the time of preprocessing. When this option is enabled, the preprocessor emits, after the initial linemarker, a second linemarker with the current working directory followed by two slashes. This option is implicitly enabled if debugging information is enabled, but this can be inhibited with the negated form -fno-working-directory. If the -P flag is present in the command line, this option has no effect, since no line directives are emitted whatsoever. Make an assertion with the predicate predicate and answer answer. This form is options to the older form -A predicate answer define, which is still supported, because it does not use shell special characters. 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. You should be prepared for side effects when using -C ; it causes the preprocessor to treat comments as tokens in their own right. Do not discard comments, including during macro expansion. This is like -Cexcept that comments contained within define are also passed through to the output file where the macro is expanded. This is to prevent later use of that macro from inadvertently commenting out the remainder of options source line. 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. Try to imitate the behavior of pre-standard C preprocessors, as opposed to ISO C preprocessors. See loftware GNU CPP manual for details. Note that GCC does not otherwise attempt to emulate a pre-standard C compiler, and these options are only supported with the -E switch, or when invoking CPP explicitly. Support ISO C trigraphs. By default, GCC ignores trigraphs, but in standard-conforming modes it converts them. See the -std and -ansi options. Enable special code to work around file systems which only permit very short file names, such as MS-DOS. Print the name of each header file used, in addition to other normal activities. Says to make debugging dumps during compilation as specified by letters. The flags documented here are those relevant to the preprocessor. Other letters are interpreted by the compiler proper, or reserved for future versions of GCC, and so are silently ignored. If you specify letters whose behavior conflicts, the result is undefined. See Developer Optionsfor more information. This gives you a way of finding out what is predefined in your version of the preprocessor. Assuming you have no file foo. If you use -dM without the -E option, -dM is loftware as a synonym for -fdump-rtl-mach. See gcc Developer Options. Like -dM except in two respects: Both kinds of output go to the standard output file. This option is only useful for debugging GCC. When used from CPP or with -Eit dumps debugging information about location maps. Every token in the output is preceded by the dump of the map its location belongs to. You can use -Wp, option to bypass the compiler driver and pass option define through output the preprocessor. If option contains commas, it is split into multiple options at the commas. However, many options are modified, translated or interpreted by the compiler driver before being passed to the preprocessor, and -Wp forcibly bypasses this phase. Pass option as an option to the preprocessor. You can use this to supply system-specific preprocessor options that GCC does not recognize. If you want to pass an option that takes an argument, you must use -Xpreprocessor twice, once for the option and once for the argument. Perform preprocessing as a separate pass before compilation. By default, GCC performs preprocessing as an integrated part of input tokenization and parsing. This option may be useful in conjunction with the -B or -wrapper options to specify an alternate preprocessor or perform additional processing of the program source between normal preprocessing and compilation.
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