From: Sandra Loosemore Date: Fri, 30 Dec 2016 21:22:33 +0000 (-0500) Subject: cppopts.texi: Reorder table entries to put the most commonly-used options first and... X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e4ff7948ef80c82423decf251dcc2689efbb0a75;p=gcc.git cppopts.texi: Reorder table entries to put the most commonly-used options first and debug... 2016-12-30 Sandra Loosemore gcc/ * doc/cppopts.texi: Reorder table entries to put the most commonly-used options first and debug options last. From-SVN: r243984 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ead35e3688f..56123f6ad18 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2016-12-30 Sandra Loosemore + + * doc/cppopts.texi: Reorder table entries to put the most + commonly-used options first and debug options last. + 2016-12-30 Uros Bizjak * config/i386/i386.md (*testqi_ext_3): Merge insn pattern and diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index 82204418aa0..4588eb4fcd5 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -39,6 +39,28 @@ are given on the command line. All @option{-imacros @var{file}} and Cancel any previous definition of @var{name}, either built in or provided with a @option{-D} option. +@item -include @var{file} +@opindex include +Process @var{file} as if @code{#include "file"} appeared as the first +line of the primary source file. However, the first directory searched +for @var{file} is the preprocessor's working directory @emph{instead of} +the directory containing the main source file. If not found there, it +is searched for in the remainder of the @code{#include "@dots{}"} search +chain as normal. + +If multiple @option{-include} options are given, the files are included +in the order they appear on the command line. + +@item -imacros @var{file} +@opindex imacros +Exactly like @option{-include}, except that any output produced by +scanning @var{file} is thrown away. Macros it defines remain defined. +This allows you to acquire all the macros from a header without also +processing its declarations. + +All files specified by @option{-imacros} are processed before all files +specified by @option{-include}. + @item -undef @opindex undef Do not predefine any system-specific or GCC-specific macros. The @@ -177,57 +199,21 @@ a dependency output file as a side-effect of the compilation process. Like @option{-MD} except mention only user header files, not system header files. -@ifclear cppmanual -@item -fpch-deps -@opindex fpch-deps -When using precompiled headers (@pxref{Precompiled Headers}), this flag -will cause the dependency-output flags to also list the files from the -precompiled header's dependencies. If not specified only the -precompiled header would be listed and not the files that were used to -create it because those files are not consulted when a precompiled -header is used. - -@item -fpch-preprocess -@opindex fpch-preprocess -This option allows use of a precompiled header (@pxref{Precompiled -Headers}) together with @option{-E}. It inserts a special @code{#pragma}, -@code{#pragma GCC pch_preprocess "@var{filename}"} in the output to mark -the place where the precompiled header was found, and its @var{filename}. -When @option{-fpreprocessed} is in use, GCC recognizes this @code{#pragma} -and loads the PCH@. +@item -fpreprocessed +@opindex 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 @option{-C} to the compiler without +problems. In this mode the integrated preprocessor is little more than +a tokenizer for the front ends. -This option is off by default, because the resulting preprocessed output -is only really suitable as input to GCC@. It is switched on by +@option{-fpreprocessed} is implicit if the input file has one of the +extensions @samp{.i}, @samp{.ii} or @samp{.mi}. These are the +extensions that GCC uses for preprocessed files created by @option{-save-temps}. -You should not write this @code{#pragma} in your own code, but it is -safe to edit the filename if the PCH file is available in a different -location. The filename may be absolute or it may be relative to GCC's -current directory. -@end ifclear - -@item -include @var{file} -@opindex include -Process @var{file} as if @code{#include "file"} appeared as the first -line of the primary source file. However, the first directory searched -for @var{file} is the preprocessor's working directory @emph{instead of} -the directory containing the main source file. If not found there, it -is searched for in the remainder of the @code{#include "@dots{}"} search -chain as normal. - -If multiple @option{-include} options are given, the files are included -in the order they appear on the command line. - -@item -imacros @var{file} -@opindex imacros -Exactly like @option{-include}, except that any output produced by -scanning @var{file} is thrown away. Macros it defines remain defined. -This allows you to acquire all the macros from a header without also -processing its declarations. - -All files specified by @option{-imacros} are processed before all files -specified by @option{-include}. - @item -fdirectives-only @opindex fdirectives-only When preprocessing, handle directives, but do not expand macros. @@ -267,21 +253,6 @@ enabled by default for C99 (and later C standard versions) and C++. @opindex fno-canonical-system-headers When preprocessing, do not shorten system header paths with canonicalization. -@item -fpreprocessed -@opindex 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 @option{-C} to the compiler without -problems. In this mode the integrated preprocessor is little more than -a tokenizer for the front ends. - -@option{-fpreprocessed} is implicit if the input file has one of the -extensions @samp{.i}, @samp{.ii} or @samp{.mi}. These are the -extensions that GCC uses for preprocessed files created by -@option{-save-temps}. - @item -ftabstop=@var{width} @opindex ftabstop Set the distance between tab stops. This helps the preprocessor report @@ -289,19 +260,6 @@ 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. -@item -fdebug-cpp -@opindex fdebug-cpp -This option is only useful for debugging GCC. When used with -@option{-E}, dumps debugging information about location maps. Every -token in the output is preceded by the dump of the map its location -belongs to. The dump of the map holding the location of a token would -be: -@smallexample -@{@samp{P}:@file{/file/path};@samp{F}:@file{/includer/path};@samp{L}:@var{line_num};@samp{C}:@var{col_num};@samp{S}:@var{system_header_p};@samp{M}:@var{map_address};@samp{E}:@var{macro_expansion_p},@samp{loc}:@var{location}@} -@end smallexample - -When used without @option{-E}, this option has no effect. - @item -ftrack-macro-expansion@r{[}=@var{level}@r{]} @opindex ftrack-macro-expansion Track locations of tokens across macro expansions. This allows the @@ -350,6 +308,35 @@ or this command-line option. Currently the command-line option takes precedence if there's a conflict. @var{charset} can be any encoding supported by the system's @code{iconv} library routine. +@ifclear cppmanual +@item -fpch-deps +@opindex fpch-deps +When using precompiled headers (@pxref{Precompiled Headers}), this flag +will cause the dependency-output flags to also list the files from the +precompiled header's dependencies. If not specified only the +precompiled header would be listed and not the files that were used to +create it because those files are not consulted when a precompiled +header is used. + +@item -fpch-preprocess +@opindex fpch-preprocess +This option allows use of a precompiled header (@pxref{Precompiled +Headers}) together with @option{-E}. It inserts a special @code{#pragma}, +@code{#pragma GCC pch_preprocess "@var{filename}"} in the output to mark +the place where the precompiled header was found, and its @var{filename}. +When @option{-fpreprocessed} is in use, GCC recognizes this @code{#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 +@option{-save-temps}. + +You should not write this @code{#pragma} in your own code, but it is +safe to edit the filename if the PCH file is available in a different +location. The filename may be absolute or it may be relative to GCC's +current directory. +@end ifclear + @item -fworking-directory @opindex fworking-directory @opindex fno-working-directory @@ -380,70 +367,6 @@ it does not use shell special characters. Cancel an assertion with the predicate @var{predicate} and answer @var{answer}. -@item -dCHARS -@var{CHARS} 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 GCC, and so -are silently ignored. If you specify characters whose behavior -conflicts, the result is undefined. - -@table @samp -@item M -@opindex dM -Instead of the normal output, generate a list of @samp{#define} -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 @file{foo.h}, the command - -@smallexample -touch foo.h; cpp -dM foo.h -@end smallexample - -@noindent -will show all the predefined macros. - -@ifclear cppmanual -If you use @option{-dM} without the @option{-E} option, @option{-dM} is -interpreted as a synonym for @option{-fdump-rtl-mach}. -@xref{Developer Options, , ,gcc}. -@end ifclear - -@item D -@opindex dD -Like @samp{M} except in two respects: it does @emph{not} include the -predefined macros, and it outputs @emph{both} the @samp{#define} -directives and the result of preprocessing. Both kinds of output go to -the standard output file. - -@item N -@opindex dN -Like @samp{D}, but emit only the macro names, not their expansions. - -@item I -@opindex dI -Output @samp{#include} directives in addition to the result of -preprocessing. - -@item U -@opindex dU -Like @samp{D} 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 -@samp{#undef} directives are also output for macros tested but -undefined at the time. -@end table - -@item -P -@opindex 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. -@ifset cppmanual -@xref{Preprocessor Output}. -@end ifset - @item -C @opindex C Do not discard comments. All comments are passed through to the output @@ -469,6 +392,16 @@ the source line. The @option{-CC} option is generally used to support lint comments. +@item -P +@opindex 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. +@ifset cppmanual +@xref{Preprocessor Output}. +@end ifset + @cindex traditional C language @cindex C language, traditional @item -traditional @@ -526,3 +459,70 @@ activities. Each name is indented to show how deep in the printed, even if they are found to be invalid; an invalid precompiled header file is printed with @samp{...x} and a valid one with @samp{...!} . +@item -dCHARS +@var{CHARS} 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 GCC, and so +are silently ignored. If you specify characters whose behavior +conflicts, the result is undefined. + +@table @samp +@item M +@opindex dM +Instead of the normal output, generate a list of @samp{#define} +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 @file{foo.h}, the command + +@smallexample +touch foo.h; cpp -dM foo.h +@end smallexample + +@noindent +will show all the predefined macros. + +@ifclear cppmanual +If you use @option{-dM} without the @option{-E} option, @option{-dM} is +interpreted as a synonym for @option{-fdump-rtl-mach}. +@xref{Developer Options, , ,gcc}. +@end ifclear + +@item D +@opindex dD +Like @samp{M} except in two respects: it does @emph{not} include the +predefined macros, and it outputs @emph{both} the @samp{#define} +directives and the result of preprocessing. Both kinds of output go to +the standard output file. + +@item N +@opindex dN +Like @samp{D}, but emit only the macro names, not their expansions. + +@item I +@opindex dI +Output @samp{#include} directives in addition to the result of +preprocessing. + +@item U +@opindex dU +Like @samp{D} 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 +@samp{#undef} directives are also output for macros tested but +undefined at the time. +@end table + +@item -fdebug-cpp +@opindex fdebug-cpp +This option is only useful for debugging GCC. When used with +@option{-E}, dumps debugging information about location maps. Every +token in the output is preceded by the dump of the map its location +belongs to. The dump of the map holding the location of a token would +be: +@smallexample +@{@samp{P}:@file{/file/path};@samp{F}:@file{/includer/path};@samp{L}:@var{line_num};@samp{C}:@var{col_num};@samp{S}:@var{system_header_p};@samp{M}:@var{map_address};@samp{E}:@var{macro_expansion_p},@samp{loc}:@var{location}@} +@end smallexample + +When used without @option{-E}, this option has no effect. +