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Commit e4ff7948 by Sandra Loosemore Committed by Sandra Loosemore
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cppopts.texi: Reorder table entries to put the most commonly-used options first and debug... 

2016-12-30  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/cppopts.texi: Reorder table entries to put the most 
	commonly-used options first and debug options last.

From-SVN: r243984
parent 38381536
Showing with 145 additions and 140 deletions
gcc/ChangeLog
2016-12-30 Sandra Loosemore <sandra@codesourcery.com>
* doc/cppopts.texi: Reorder table entries to put the most
commonly-used options first and debug options last.
2016-12-30 Uros Bizjak <ubizjak@gmail.com> 2016-12-30 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (*testqi_ext_3): Merge insn pattern and * config/i386/i386.md (*testqi_ext_3): Merge insn pattern and
gcc/doc/cppopts.texi
...@@ -39,6 +39,28 @@ are given on the command line. All @option{-imacros @var{file}} and ...@@ -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 Cancel any previous definition of @var{name}, either built in or
provided with a @option{-D} option. 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 @item -undef
@opindex undef @opindex undef
Do not predefine any system-specific or GCC-specific macros. The 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. ...@@ -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 Like @option{-MD} except mention only user header files, not system
header files. header files.
@ifclear cppmanual @item -fpreprocessed
@item -fpch-deps @opindex fpreprocessed
@opindex fpch-deps Indicate to the preprocessor that the input file has already been
When using precompiled headers (@pxref{Precompiled Headers}), this flag preprocessed. This suppresses things like macro expansion, trigraph
will cause the dependency-output flags to also list the files from the conversion, escaped newline splicing, and processing of most directives.
precompiled header's dependencies. If not specified only the The preprocessor still recognizes and removes comments, so that you can
precompiled header would be listed and not the files that were used to pass a file preprocessed with @option{-C} to the compiler without
create it because those files are not consulted when a precompiled problems. In this mode the integrated preprocessor is little more than
header is used. a tokenizer for the front ends.
@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 @option{-fpreprocessed} is implicit if the input file has one of the
is only really suitable as input to GCC@. It is switched on by extensions @samp{.i}, @samp{.ii} or @samp{.mi}. These are the
extensions that GCC uses for preprocessed files created by
@option{-save-temps}. @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 @item -fdirectives-only
@opindex fdirectives-only @opindex fdirectives-only
When preprocessing, handle directives, but do not expand macros. 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++. ...@@ -267,21 +253,6 @@ enabled by default for C99 (and later C standard versions) and C++.
@opindex fno-canonical-system-headers @opindex fno-canonical-system-headers
When preprocessing, do not shorten system header paths with canonicalization. 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} @item -ftabstop=@var{width}
@opindex ftabstop @opindex ftabstop
Set the distance between tab stops. This helps the preprocessor report 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 ...@@ -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 line. If the value is less than 1 or greater than 100, the option is
ignored. The default is 8. 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{]} @item -ftrack-macro-expansion@r{[}=@var{level}@r{]}
@opindex ftrack-macro-expansion @opindex ftrack-macro-expansion
Track locations of tokens across macro expansions. This allows the 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 ...@@ -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 precedence if there's a conflict. @var{charset} can be any encoding
supported by the system's @code{iconv} library routine. 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 @item -fworking-directory
@opindex fworking-directory @opindex fworking-directory
@opindex fno-working-directory @opindex fno-working-directory
...@@ -380,70 +367,6 @@ it does not use shell special characters. ...@@ -380,70 +367,6 @@ it does not use shell special characters.
Cancel an assertion with the predicate @var{predicate} and answer Cancel an assertion with the predicate @var{predicate} and answer
@var{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 @item -C
@opindex C @opindex C
Do not discard comments. All comments are passed through to the output Do not discard comments. All comments are passed through to the output
...@@ -469,6 +392,16 @@ the source line. ...@@ -469,6 +392,16 @@ the source line.
The @option{-CC} option is generally used to support lint comments. 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 traditional C language
@cindex C language, traditional @cindex C language, traditional
@item -traditional @item -traditional
...@@ -526,3 +459,70 @@ activities. Each name is indented to show how deep in the ...@@ -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 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{...!} . 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.
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