-@c Copyright (c) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
-@c Free Software Foundation, Inc.
+@c Copyright (c) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+@c 2010, Free Software Foundation, Inc.
@c This is part of the CPP and GCC manuals.
@c For copying conditions, see the file gcc.texi.
(@pxref{System Headers})
@end ifset
.
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
@item -o @var{file}
@opindex o
@xref{Traditional Mode}.
@end ifset
-@item -Wimport
-@opindex Wimport
-Warn the first time @samp{#import} is used.
-
@item -Wundef
@opindex Wundef
Warn whenever an identifier which is not a macro is encountered in an
@option{-imacros} command line options.
Unless specified explicitly (with @option{-MT} or @option{-MQ}), the
-object file name consists of the basename of the source file with any
-suffix replaced with object file suffix. If there are many included
-files then the rule is split into several lines using @samp{\}-newline.
-The rule has no commands.
+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 @samp{\}-newline. The rule has no
+commands.
This option does not suppress the preprocessor's debug output, such as
@option{-dM}. To avoid mixing such debug output with the dependency
@opindex MT
Change the target of the rule emitted by dependency generation. By
-default CPP takes the name of the main input file, including any path,
-deletes any file suffix such as @samp{.c}, and appends the platform's
-usual object suffix. The result is the target.
+default CPP takes the name of the main input file, deletes any
+directory components and any file suffix such as @samp{.c}, and
+appends the platform's usual object suffix. The result is the target.
An @option{-MT} option will set the target to be exactly the string you
specify. If you want multiple targets, you can specify them as a single
@option{-MD} is equivalent to @option{-M -MF @var{file}}, except that
@option{-E} is not implied. The driver determines @var{file} based on
whether an @option{-o} option is given. If it is, the driver uses its
-argument but with a suffix of @file{.d}, otherwise it take the
-basename of the input file and applies a @file{.d} suffix.
+argument but with a suffix of @file{.d}, otherwise it takes the name
+of the input file, removes any directory components and suffix, and
+applies a @file{.d} suffix.
If @option{-MD} is used in conjunction with @option{-E}, any
@option{-o} switch is understood to specify the dependency output file
@var{standard}
may be one of:
@table @code
-@item iso9899:1990
+@item c90
@itemx c89
-The ISO C standard from 1990. @samp{c89} is the customary shorthand for
+@itemx iso9899:1990
+The ISO C standard from 1990. @samp{c90} is the customary shorthand for
this version of the standard.
-The @option{-ansi} option is equivalent to @option{-std=c89}.
+The @option{-ansi} option is equivalent to @option{-std=c90}.
@item iso9899:199409
The 1990 C standard, as amended in 1994.
The revised ISO C standard, published in December 1999. Before
publication, this was known as C9X@.
-@item gnu89
+@item c1x
+The next version of the ISO C standard, still under development.
+
+@item gnu90
+@itemx gnu89
The 1990 C standard plus GNU extensions. This is the default.
@item gnu99
@itemx gnu9x
The 1999 C standard plus GNU extensions.
+@item gnu1x
+The next version of the ISO C standard, still under development, plus
+GNU extensions.
+
@item c++98
The 1998 ISO C++ standard plus amendments.
Search @var{dir} for header files, but do it @emph{after} all
directories specified with @option{-I} and the standard system directories
have been exhausted. @var{dir} is treated as a system include directory.
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
@item -iprefix @var{prefix}
@opindex iprefix
@ifset cppmanual
@xref{System Headers}.
@end ifset
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
@item -iquote @var{dir}
@opindex iquote
@ifset cppmanual
@xref{Search Path}.
@end ifset
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
+
+@item -fdirectives-only
+@opindex fdirectives-only
+When preprocessing, handle directives, but do not expand macros.
+
+The option's behavior depends on the @option{-E} and @option{-fpreprocessed}
+options.
+
+With @option{-E}, preprocessing is limited to the handling of directives
+such as @code{#define}, @code{#ifdef}, and @code{#error}. Other
+preprocessor operations, such as macro expansion and trigraph
+conversion are not performed. In addition, the @option{-dD} option is
+implicitly enabled.
+
+With @option{-fpreprocessed}, predefinition of command line and most
+builtin macros is disabled. Macros such as @code{__LINE__}, which are
+contextually dependent, are handled normally. This enables compilation of
+files previously preprocessed with @code{-E -fdirectives-only}.
+
+With both @option{-E} and @option{-fpreprocessed}, the rules for
+@option{-fpreprocessed} take precedence. This enables full preprocessing of
+files previously preprocessed with @code{-E -fdirectives-only}.
@item -fdollars-in-identifiers
@opindex fdollars-in-identifiers
@anchor{fdollars-in-identifiers}
Accept @samp{$} in identifiers.
@ifset cppmanual
- @xref{Identifier characters}.
+@xref{Identifier characters}.
@end ifset
@item -fextended-identifiers
@var{predicate}(@var{answer})}, which is still supported, because
it does not use shell special characters.
@ifset cppmanual
-@xref{Assertions}.
+@xref{Obsolete Features}.
@end ifset
@item -A -@var{predicate}=@var{answer}
@noindent
will show all the predefined macros.
+If you use @option{-dM} without the @option{-E} option, @option{-dM} is
+interpreted as a synonym for @option{-fdump-rtl-mach}.
+@xref{Debugging Options, , ,gcc}.
+
@item D
@opindex dD
Like @samp{M} except in two respects: it does @emph{not} include the
@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
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