-Werror -Werror=* @gol
-Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 @gol
-Wno-format-extra-args -Wformat-nonliteral @gol
--Wformat-security -Wformat-y2k -Wignored-qualifiers @gol
+-Wformat-security -Wformat-y2k @gol
+-Wframe-larger-than=@var{len} -Wignored-qualifiers @gol
-Wimplicit -Wimplicit-function-declaration -Wimplicit-int @gol
-Wimport -Wno-import -Winit-self -Winline @gol
-Wno-int-to-pointer-cast -Wno-invalid-offsetof @gol
-fauto-inc-dec -fbranch-probabilities -fbranch-target-load-optimize @gol
-fbranch-target-load-optimize2 -fbtr-bb-exclusive -fcaller-saves @gol
-fcheck-data-deps -fcprop-registers -fcrossjumping -fcse-follow-jumps @gol
--fcse-skip-blocks -fcx-limited-range -fdata-sections -fdce -fdce @gol
+-fcse-skip-blocks -fcx-limited-range @gol
+-fdata-sections -fdce -fdce @gol
-fdelayed-branch -fdelete-null-pointer-checks -fdse -fdse @gol
-fearly-inlining -fexpensive-optimizations -ffast-math @gol
-ffinite-math-only -ffloat-store -fforward-propagate @gol
Supported by GCC}, for details of these standard versions. This option
is currently only supported when compiling C or C++.
+The compiler can accept several base standards, such as @samp{c89} or
+@samp{c++98}, and GNU dialects of those standards, such as
+@samp{gnu89} or @samp{gnu++98}. By specifing a base standard, the
+compiler will accept all programs following that standard and those
+using GNU extensions that do not contradict it. For example,
+@samp{-std=c89} turns off certain features of GCC that are
+incompatible with ISO C90, such as the @code{asm} and @code{typeof}
+keywords, but not other GNU extensions that do not have a meaning in
+ISO C90, such as omitting the middle term of a @code{?:}
+expression. On the other hand, by specifing a GNU dialect of a
+standard, all features the compiler support are enabled, even when
+those features change the meaning of the base standard and some
+strict-conforming programs may be rejected. The particular standard
+is used by @option{-pedantic} to identify which features are GNU
+extensions given that version of the standard. For example
+@samp{-std=gnu89 -pedantic} would warn about C++ style @samp{//}
+comments, while @samp{-std=gnu99 -pedantic} would not.
+
A value for this option must be provided; possible values are
@table @samp
@item c89
@itemx iso9899:1990
-ISO C90 (same as @option{-ansi}).
+Support all ISO C90 programs (certain GNU extensions that conflict
+with ISO C90 are disabled). Same as @option{-ansi} for C code.
@item iso9899:199409
ISO C90 as modified in amendment 1.
names @samp{c9x} and @samp{iso9899:199x} are deprecated.
@item gnu89
-Default, ISO C90 plus GNU extensions (including some C99 features).
+GNU dialect of ISO C90 (including some C99 features). This
+is the default for C code.
@item gnu99
@itemx gnu9x
-ISO C99 plus GNU extensions. When ISO C99 is fully implemented in GCC,
+GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC,
this will become the default. The name @samp{gnu9x} is deprecated.
@item c++98
-The 1998 ISO C++ standard plus amendments.
+The 1998 ISO C++ standard plus amendments. Same as @option{-ansi} for
+C++ code.
@item gnu++98
-The same as @option{-std=c++98} plus GNU extensions. This is the
-default for C++ code.
+GNU dialect of @option{-std=c++98}. This is the default for
+C++ code.
@item c++0x
The working draft of the upcoming ISO C++0x standard. This option
not part of the C++0x standard.
@item gnu++0x
-The same as @option{-std=c++0x} plus GNU extensions. As with
-@option{-std=c++0x}, this option enables experimental features that may
-be removed in future versions of GCC.
+GNU dialect of @option{-std=c++0x}. This option enables
+experimental features that may be removed in future versions of GCC.
@end table
-Even when this option is not specified, you can still use some of the
-features of newer standards in so far as they do not conflict with
-previous C standards. For example, you may use @code{__restrict__} even
-when @option{-std=c99} is not specified.
-
-The @option{-std} options specifying some version of ISO C have the same
-effects as @option{-ansi}, except that features that were not in ISO C90
-but are in the specified version (for example, @samp{//} comments and
-the @code{inline} keyword in ISO C99) are not disabled.
-
@item -fgnu89-inline
@opindex fgnu89-inline
The option @option{-fgnu89-inline} tells GCC to use the traditional
@opindex Wlarger-than-@var{len}
Warn whenever an object of larger than @var{len} bytes is defined.
+@item -Wframe-larger-than=@var{len}
+@opindex Wframe-larger-than
+Warn whenever the size of a function frame is larger than @var{len} bytes.
+
@item -Wunsafe-loop-optimizations
@opindex Wunsafe-loop-optimizations
@opindex Wno-unsafe-loop-optimizations
Unfortunately, there are some characters which ISO C and ISO C++ allow
in identifiers that when turned into NFC aren't allowable as
identifiers. That is, there's no way to use these symbols in portable
-ISO C or C++ and have all your identifiers in NFC.
+ISO C or C++ and have all your identifiers in NFC@.
@option{-Wnormalized=id} suppresses the warning for these characters.
It is hoped that future versions of the standards involved will correct
this, which is why this option is not the default.
@item storeccp
@opindex fdump-tree-storeccp
-Dump each function after STORE-CCP. The file name is made by appending
+Dump each function after STORE-CCP@. The file name is made by appending
@file{.storeccp} to the source file name.
@item pre
(if the debugging information format supports this information).
It is enabled by default when compiling with optimization (@option{-Os},
-@option{-O}, @option{-O2}, ...), debugging information (@option{-g}) and
+@option{-O}, @option{-O2}, @dots{}), debugging information (@option{-g}) and
the debug info format supports it.
@item -print-file-name=@var{library}
@item -fforward-propagate
@opindex fforward-propagate
-Perform a forward propagation pass on RTL. The pass tries to combine two
+Perform a forward propagation pass on RTL@. The pass tries to combine two
instructions and checks if the result can be simplified. If loop unrolling
is active, two passes are performed and the second is scheduled after
loop unrolling.
@item -fdce
@opindex fdce
-Perform dead code elimination (DCE) on RTL.
+Perform dead code elimination (DCE) on RTL@.
Enabled by default at @option{-O} and higher.
@item -fdse
@opindex fdse
-Perform dead store elimination (DSE) on RTL.
+Perform dead store elimination (DSE) on RTL@.
Enabled by default at @option{-O} and higher.
@item -fif-conversion
@item -fcx-limited-range
@opindex fcx-limited-range
When enabled, this option states that a range reduction step is not
-needed when performing complex division. The default is
-@option{-fno-cx-limited-range}, but is enabled by @option{-ffast-math}.
+needed when performing complex division. Also, there is no checking
+whether the result of a complex multiplication or division is @code{NaN
++ I*NaN}, with an attempt to rescue the situation in that case. The
+default is @option{-fno-cx-limited-range}, but is enabled by
+@option{-ffast-math}.
This option controls the default setting of the ISO C99
@code{CX_LIMITED_RANGE} pragma. Nevertheless, the option applies to
@opindex msim
Specifies that the program will be run on the simulator. This causes
an alternate runtime library to be linked in which supports, for
-example, file I/O. You must not use this option when generating
+example, file I/O@. You must not use this option when generating
programs that will run on real hardware; you must provide your own
runtime library for whatever I/O functions are needed.
@item -m5200
@opindex m5200
-Generate output for a 520X ColdFire CPU. This is the default
+Generate output for a 520X ColdFire CPU@. This is the default
when the compiler is configured for 520X-based systems.
It is equivalent to @option{-mcpu=5206}, and is now deprecated
in favor of that option.
@item -m5206e
@opindex m5206e
-Generate output for a 5206e ColdFire CPU. The option is now
+Generate output for a 5206e ColdFire CPU@. The option is now
deprecated in favor of the equivalent @option{-mcpu=5206e}.
@item -m528x
@item -m5307
@opindex m5307
-Generate output for a ColdFire 5307 CPU. The option is now deprecated
+Generate output for a ColdFire 5307 CPU@. The option is now deprecated
in favor of the equivalent @option{-mcpu=5307}.
@item -m5407
@opindex m5407
-Generate output for a ColdFire 5407 CPU. The option is now deprecated
+Generate output for a ColdFire 5407 CPU@. The option is now deprecated
in favor of the equivalent @option{-mcpu=5407}.
@item -mcfv4e
@opindex mhard-float
@opindex m68881
Generate floating-point instructions. This is the default for 68020
-and above, and for ColdFire devices that have an FPU. It defines the
+and above, and for ColdFire devices that have an FPU@. It defines the
macro @samp{__HAVE_68881__} on M680x0 targets and @samp{__mcffpu__}
on ColdFire targets.
@itemx -mno-dsp
@opindex mdsp
@opindex mno-dsp
-Use (do not use) revision 1 of the MIPS DSP ASE.
+Use (do not use) revision 1 of the MIPS DSP ASE@.
@xref{MIPS DSP Built-in Functions}. This option defines the
preprocessor macro @samp{__mips_dsp}. It also defines
@samp{__mips_dsp_rev} to 1.
@itemx -mno-dspr2
@opindex mdspr2
@opindex mno-dspr2
-Use (do not use) revision 2 of the MIPS DSP ASE.
+Use (do not use) revision 2 of the MIPS DSP ASE@.
@xref{MIPS DSP Built-in Functions}. This option defines the
preprocessor macros @samp{__mips_dsp} and @samp{__mips_dspr2}.
It also defines @samp{__mips_dsp_rev} to 2.
@opindex mlocal-sdata
@opindex mno-local-sdata
Extend (do not extend) the @option{-G} behavior to local data too,
-such as to static variables in C. @option{-mlocal-sdata} is the
+such as to static variables in C@. @option{-mlocal-sdata} is the
default for all configurations.
If the linker complains that an application is using too much small data,
@opindex mxl-compat
@opindex mno-xl-compat
Produce code that conforms more closely to IBM XL compiler semantics
-when using AIX-compatible ABI. Pass floating-point arguments to
+when using AIX-compatible ABI@. Pass floating-point arguments to
prototyped functions beyond the register save area (RSA) on the stack
in addition to argument FPRs. Do not assume that most significant
double in 128-bit long double value is properly rounded when comparing
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