@xref{Overall Options,,Options Controlling the Kind of Output}.
@gccoptlist{-c -S -E -o @var{file} -combine -pipe -pass-exit-codes @gol
-x @var{language} -v -### --help@r{[}=@var{class}@r{]} --target-help @gol
---version @@@var{file}}
+--version -wrapper@@@var{file}}
@item C Language Options
@xref{C Dialect Options,,Options Controlling C Dialect}.
-fvisibility-ms-compat @gol
-Wabi -Wctor-dtor-privacy @gol
-Wnon-virtual-dtor -Wreorder @gol
--Weffc++ -Wno-deprecated -Wstrict-null-sentinel @gol
+-Weffc++ -Wstrict-null-sentinel @gol
-Wno-non-template-friend -Wold-style-cast @gol
-Woverloaded-virtual -Wno-pmf-conversions @gol
-Wsign-promo}
-w -Wextra -Wall -Waddress -Waggregate-return -Warray-bounds @gol
-Wno-attributes -Wc++-compat -Wc++0x-compat -Wcast-align -Wcast-qual @gol
-Wchar-subscripts -Wclobbered -Wcomment @gol
--Wconversion -Wcoverage-mismatch -Wno-deprecated-declarations @gol
--Wdisabled-optimization -Wno-div-by-zero @gol
+-Wconversion -Wcoverage-mismatch -Wno-deprecated @gol
+-Wno-deprecated-declarations -Wdisabled-optimization -Wno-div-by-zero @gol
-Wempty-body -Wno-endif-labels @gol
-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
+-Wno-format-contains-nul -Wno-format-extra-args -Wformat-nonliteral @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
--Winvalid-pch -Wlarger-than-@var{len} -Wunsafe-loop-optimizations @gol
+-Winvalid-pch -Wlarger-than=@var{len} -Wunsafe-loop-optimizations @gol
-Wlogical-op -Wlong-long @gol
-Wmain -Wmissing-braces -Wmissing-field-initializers @gol
-Wmissing-format-attribute -Wmissing-include-dirs @gol
--Wmissing-noreturn @gol
+-Wmissing-noreturn -Wno-mudflap @gol
-Wno-multichar -Wnonnull -Wno-overflow @gol
-Woverlength-strings -Wpacked -Wpadded @gol
-Wparentheses -Wpointer-arith -Wno-pointer-to-int-cast @gol
-fdump-noaddr -fdump-unnumbered -fdump-translation-unit@r{[}-@var{n}@r{]} @gol
-fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
-fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
+-fdump-statistics @gol
-fdump-tree-all @gol
-fdump-tree-original@r{[}-@var{n}@r{]} @gol
-fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
-fdump-tree-nrv -fdump-tree-vect @gol
-fdump-tree-sink @gol
-fdump-tree-sra@r{[}-@var{n}@r{]} @gol
--fdump-tree-salias @gol
-fdump-tree-fre@r{[}-@var{n}@r{]} @gol
-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
-ftree-vectorizer-verbose=@var{n} @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-fortran-rules -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
-fno-toplevel-reorder -fno-trapping-math -fno-zero-initialized-in-bss @gol
-fomit-frame-pointer -foptimize-register-move -foptimize-sibling-calls @gol
-fpeel-loops -fpredictive-commoning -fprefetch-loop-arrays @gol
--fprofile-generate -fprofile-use -fprofile-values -freciprocal-math @gol
--fregmove -frename-registers -freorder-blocks @gol
+-fprofile-dir=@var{path} -fprofile-generate -fprofile-generate=@var{path} @gol
+-fprofile-use -fprofile-use=@var{path} -fprofile-values @gol
+-freciprocal-math -fregmove -frename-registers -freorder-blocks @gol
-freorder-blocks-and-partition -freorder-functions @gol
-frerun-cse-after-loop -freschedule-modulo-scheduled-loops @gol
-frounding-math -frtl-abstract-sequences -fsched2-use-superblocks @gol
-fsignaling-nans -fsingle-precision-constant -fsplit-ivs-in-unroller @gol
-fsplit-wide-types -fstack-protector -fstack-protector-all @gol
-fstrict-aliasing -fstrict-overflow -fthread-jumps -ftracer -ftree-ccp @gol
--ftree-ch -ftree-copy-prop -ftree-copyrename -ftree-dce @gol
+-ftree-ch -ftree-copy-prop -ftree-copyrename -ftree-dce -ftree-builtin-dce@gol
-ftree-dominator-opts -ftree-dse -ftree-fre -ftree-loop-im @gol
+-ftree-loop-distribution @gol
-ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize @gol
--ftree-parallelize-loops=@var{n} -ftree-pre -ftree-reassoc -ftree-salias @gol
+-ftree-parallelize-loops=@var{n} -ftree-pre -ftree-reassoc @gol
-ftree-sink -ftree-sra -ftree-store-ccp -ftree-ter @gol
-ftree-vect-loop-version -ftree-vectorize -ftree-vrp -funit-at-a-time @gol
-funroll-all-loops -funroll-loops -funsafe-loop-optimizations @gol
-mno-id-shared-library -mshared-library-id=@var{n} @gol
-mleaf-id-shared-library -mno-leaf-id-shared-library @gol
-msep-data -mno-sep-data -mlong-calls -mno-long-calls @gol
--mfast-fp -minline-plt}
+-mfast-fp -minline-plt -mmulticore -mcorea -mcoreb -msdram}
@emph{CRIS Options}
@gccoptlist{-mcpu=@var{cpu} -march=@var{cpu} -mtune=@var{cpu} @gol
-mno-wide-multiply -mrtd -malign-double @gol
-mpreferred-stack-boundary=@var{num} -mcx16 -msahf -mrecip @gol
-mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 @gol
+-maes -mpclmul @gol
-msse4a -m3dnow -mpopcnt -mabm -msse5 @gol
-mthreads -mno-align-stringops -minline-all-stringops @gol
-mpush-args -maccumulate-outgoing-args -m128bit-long-double @gol
-m5-compact -m5-compact-nofpu @gol
-mb -ml -mdalign -mrelax @gol
-mbigtable -mfmovd -mhitachi -mrenesas -mno-renesas -mnomacsave @gol
--mieee -misize -minline-ic_invalidate -mpadstruct -mspace @gol
+-mieee -mbitops -misize -minline-ic_invalidate -mpadstruct -mspace @gol
-mprefergot -musermode -multcost=@var{number} -mdiv=@var{strategy} @gol
-mdivsi3_libfunc=@var{name} @gol
-madjust-unroll -mindexed-addressing -mgettrcost=@var{number} -mpt-fixed @gol
@emph{Xtensa Options}
@gccoptlist{-mconst16 -mno-const16 @gol
-mfused-madd -mno-fused-madd @gol
+-mserialize-volatile -mno-serialize-volatile @gol
-mtext-section-literals -mno-text-section-literals @gol
-mtarget-align -mno-target-align @gol
-mlongcalls -mno-longcalls}
@item @var{file}.f
@itemx @var{file}.for
-@itemx @var{file}.FOR
+@itemx @var{file}.ftn
Fixed form Fortran source code which should not be preprocessed.
@item @var{file}.F
+@itemx @var{file}.FOR
@itemx @var{file}.fpp
@itemx @var{file}.FPP
+@itemx @var{file}.FTN
Fixed form Fortran source code which must be preprocessed (with the traditional
preprocessor).
@item @var{file}.f90
@itemx @var{file}.f95
+@itemx @var{file}.f03
+@itemx @var{file}.f08
Free form Fortran source code which should not be preprocessed.
@item @var{file}.F90
@itemx @var{file}.F95
+@itemx @var{file}.F03
+@itemx @var{file}.F08
Free form Fortran source code which must be preprocessed (with the
traditional preprocessor).
generic, or subprogram renaming declaration). Such files are also
called @dfn{specs}.
-@itemx @var{file}.adb
+@item @var{file}.adb
Ada source code file containing a library unit body (a subprogram or
package body). Such files are also called @dfn{bodies}.
ada
f95 f95-cpp-input
java
-treelang
@end smallexample
@item -x none
@opindex version
Display the version number and copyrights of the invoked GCC@.
+@item -wrapper
+@opindex wrapper
+Invoke all subcommands under a wrapper program. It takes a single
+comma separated list as an argument, which will be used to invoke
+the wrapper:
+
+@smallexample
+gcc -c t.c -wrapper gdb,--args
+@end smallexample
+
+This will invoke all subprograms of gcc under "gdb --args",
+thus cc1 invocation will be "gdb --args cc1 ...".
+
@include @value{srcdir}/../libiberty/at-file.texi
@end table
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
headers do not obey all of these guidelines; use @samp{grep -v}
to filter out those warnings.
-@item -Wno-deprecated @r{(C++ and Objective-C++ only)}
-@opindex Wno-deprecated
-@opindex Wdeprecated
-Do not warn about usage of deprecated features. @xref{Deprecated Features}.
-
@item -Wstrict-null-sentinel @r{(C++ and Objective-C++ only)}
@opindex Wstrict-null-sentinel
@opindex Wno-strict-null-sentinel
-Wunused-label @gol
-Wunused-value @gol
-Wunused-variable @gol
+-Wvolatile-register-var @gol
}
Note that some warning flags are not implied by @option{-Wall}. Some of
If @option{-Wformat} is specified, also warn about @code{strftime}
formats which may yield only a two-digit year.
+@item -Wno-format-contains-nul
+@opindex Wno-format-contains-nul
+@opindex Wformat-contains-nul
+If @option{-Wformat} is specified, do not warn about format strings that
+contain NUL bytes.
+
@item -Wno-format-extra-args
@opindex Wno-format-extra-args
@opindex Wformat-extra-args
Warn whenever a local variable shadows another local variable, parameter or
global variable or whenever a built-in function is shadowed.
-@item -Wlarger-than-@var{len}
+@item -Wlarger-than=@var{len}
+@opindex Wlarger-than=@var{len}
@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 if the size of a function frame is larger than @var{len} bytes.
+The computation done to determine the stack frame size is approximate
+and not conservative.
+The actual requirements may be somewhat greater than @var{len}
+even if you do not get a warning. In addition, any space allocated
+via @code{alloca}, variable-length arrays, or related constructs
+is not included by the compiler when determining
+whether or not to issue a warning.
+
@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.
useful as a local coding convention if the programming environment is
unable to be fixed to display these characters distinctly.
+@item -Wno-deprecated
+@opindex Wno-deprecated
+@opindex Wdeprecated
+Do not warn about usage of deprecated features. @xref{Deprecated Features}.
+
@item -Wno-deprecated-declarations
@opindex Wno-deprecated-declarations
@opindex Wdeprecated-declarations
@opindex Wno-volatile-register-var
Warn if a register variable is declared volatile. The volatile
modifier does not inhibit all optimizations that may eliminate reads
-and/or writes to register variables.
+and/or writes to register variables. This warning is enabled by
+@option{-Wall}.
@item -Wdisabled-optimization
@opindex Wdisabled-optimization
This option is only active when @option{-fstack-protector} is active. It
warns about functions that will not be protected against stack smashing.
+@item -Wno-mudflap
+@opindex Wno-mudflap
+Suppress warnings about constructs that cannot be instrumented by
+@option{-fmudflap}.
+
@item -Woverlength-strings
@opindex Woverlength-strings
@opindex Wno-overlength-strings
and dbg_cnt(tail_call) will return false always.
@item -d@var{letters}
-@item -fdump-rtl-@var{pass}
+@itemx -fdump-rtl-@var{pass}
@opindex d
Says to make debugging dumps during compilation at times specified by
@var{letters}. This is used for debugging the RTL-based passes of the
@opindex dA
Annotate the assembler output with miscellaneous debugging information.
-@item -dB
-@itemx -fdump-rtl-bbro
-@opindex dB
+@item -fdump-rtl-bbro
@opindex fdump-rtl-bbro
Dump after block reordering, to @file{@var{file}.148r.bbro}.
-@item -dc
-@itemx -fdump-rtl-combine
-@opindex dc
+@item -fdump-rtl-combine
@opindex fdump-rtl-combine
Dump after the RTL instruction combination pass, to the file
@file{@var{file}.129r.combine}.
-@item -dC
-@itemx -fdump-rtl-ce1
+@item -fdump-rtl-ce1
@itemx -fdump-rtl-ce2
-@opindex dC
@opindex fdump-rtl-ce1
@opindex fdump-rtl-ce2
-@option{-dC} and @option{-fdump-rtl-ce1} enable dumping after the
-first if conversion, to the file @file{@var{file}.117r.ce1}. @option{-dC}
-and @option{-fdump-rtl-ce2} enable dumping after the second if
+@option{-fdump-rtl-ce1} enable dumping after the
+first if conversion, to the file @file{@var{file}.117r.ce1}.
+@option{-fdump-rtl-ce2} enable dumping after the second if
conversion, to the file @file{@var{file}.130r.ce2}.
-@item -dd
-@itemx -fdump-rtl-btl
+@item -fdump-rtl-btl
@itemx -fdump-rtl-dbr
-@opindex dd
@opindex fdump-rtl-btl
@opindex fdump-rtl-dbr
-@option{-dd} and @option{-fdump-rtl-btl} enable dumping after branch
-target load optimization, to @file{@var{file}.31.btl}. @option{-dd}
-and @option{-fdump-rtl-dbr} enable dumping after delayed branch
+@option{-fdump-rtl-btl} enable dumping after branch
+target load optimization, to @file{@var{file}.31.btl}.
+@option{-fdump-rtl-dbr} enable dumping after delayed branch
scheduling, to @file{@var{file}.36.dbr}.
@item -dD
Dump all macro definitions, at the end of preprocessing, in addition to
normal output.
-@item -dE
-@itemx -fdump-rtl-ce3
-@opindex dE
+@item -fdump-rtl-ce3
@opindex fdump-rtl-ce3
Dump after the third if conversion, to @file{@var{file}.146r.ce3}.
-@item -df
-@itemx -fdump-rtl-cfg
+@item -fdump-rtl-cfg
@itemx -fdump-rtl-life
-@opindex df
@opindex fdump-rtl-cfg
@opindex fdump-rtl-life
-@option{-df} and @option{-fdump-rtl-cfg} enable dumping after control
-and data flow analysis, to @file{@var{file}.116r.cfg}. @option{-df}
-and @option{-fdump-rtl-cfg} enable dumping dump after life analysis,
+@option{-fdump-rtl-cfg} enable dumping after control
+and data flow analysis, to @file{@var{file}.116r.cfg}.
+@option{-fdump-rtl-cfg} enable dumping dump after life analysis,
to @file{@var{file}.128r.life1} and @file{@var{file}.135r.life2}.
-@item -dg
-@itemx -fdump-rtl-greg
-@opindex dg
+@item -fdump-rtl-greg
@opindex fdump-rtl-greg
Dump after global register allocation, to @file{@var{file}.139r.greg}.
-@item -dG
-@itemx -fdump-rtl-gcse
+@item -fdump-rtl-gcse
@itemx -fdump-rtl-bypass
-@opindex dG
@opindex fdump-rtl-gcse
@opindex fdump-rtl-bypass
-@option{-dG} and @option{-fdump-rtl-gcse} enable dumping after GCSE, to
-@file{@var{file}.114r.gcse}. @option{-dG} and @option{-fdump-rtl-bypass}
+@option{-fdump-rtl-gcse} enable dumping after GCSE, to
+@file{@var{file}.114r.gcse}. @option{-fdump-rtl-bypass}
enable dumping after jump bypassing and control flow optimizations, to
@file{@var{file}.115r.bypass}.
-@item -dh
-@itemx -fdump-rtl-eh
-@opindex dh
+@item -fdump-rtl-eh
@opindex fdump-rtl-eh
Dump after finalization of EH handling code, to @file{@var{file}.02.eh}.
-@item -di
-@itemx -fdump-rtl-sibling
-@opindex di
+@item -fdump-rtl-sibling
@opindex fdump-rtl-sibling
Dump after sibling call optimizations, to @file{@var{file}.106r.sibling}.
-@item -dj
-@itemx -fdump-rtl-jump
-@opindex dj
+@item -fdump-rtl-jump
@opindex fdump-rtl-jump
Dump after the first jump optimization, to @file{@var{file}.112r.jump}.
-@item -dk
-@itemx -fdump-rtl-stack
-@opindex dk
+@item -fdump-rtl-stack
@opindex fdump-rtl-stack
Dump after conversion from GCC's "flat register file" registers to the
x87's stack-like registers, to @file{@var{file}.152r.stack}.
-@item -dl
-@itemx -fdump-rtl-lreg
-@opindex dl
+@item -fdump-rtl-lreg
@opindex fdump-rtl-lreg
Dump after local register allocation, to @file{@var{file}.138r.lreg}.
-@item -dL
-@itemx -fdump-rtl-loop2
-@opindex dL
+@item -fdump-rtl-loop2
@opindex fdump-rtl-loop2
@option{-dL} and @option{-fdump-rtl-loop2} enable dumping after the
loop optimization pass, to @file{@var{file}.119r.loop2},
@file{@var{file}.121r.loop2_invariant}, and
@file{@var{file}.125r.loop2_done}.
-@item -dm
-@itemx -fdump-rtl-sms
-@opindex dm
+@item -fdump-rtl-sms
@opindex fdump-rtl-sms
Dump after modulo scheduling, to @file{@var{file}.136r.sms}.
-@item -dM
-@itemx -fdump-rtl-mach
-@opindex dM
+@item -fdump-rtl-mach
@opindex fdump-rtl-mach
Dump after performing the machine dependent reorganization pass, to
@file{@var{file}.155r.mach} if that pass exists.
-@item -dn
-@itemx -fdump-rtl-rnreg
-@opindex dn
+@item -fdump-rtl-rnreg
@opindex fdump-rtl-rnreg
Dump after register renumbering, to @file{@var{file}.147r.rnreg}.
-@item -dN
-@itemx -fdump-rtl-regmove
-@opindex dN
+@item -fdump-rtl-regmove
@opindex fdump-rtl-regmove
Dump after the register move pass, to @file{@var{file}.132r.regmove}.
-@item -do
-@itemx -fdump-rtl-postreload
-@opindex do
+@item -fdump-rtl-postreload
@opindex fdump-rtl-postreload
Dump after post-reload optimizations, to @file{@var{file}.24.postreload}.
-@item -dr
-@itemx -fdump-rtl-expand
-@opindex dr
+@item -fdump-rtl-expand
@opindex fdump-rtl-expand
Dump after RTL generation, to @file{@var{file}.104r.expand}.
-@item -dR
-@itemx -fdump-rtl-sched2
-@opindex dR
+@item -fdump-rtl-sched2
@opindex fdump-rtl-sched2
Dump after the second scheduling pass, to @file{@var{file}.149r.sched2}.
-@item -ds
-@itemx -fdump-rtl-cse
-@opindex ds
+@item -fdump-rtl-cse
@opindex fdump-rtl-cse
Dump after CSE (including the jump optimization that sometimes follows
CSE), to @file{@var{file}.113r.cse}.
-@item -dS
-@itemx -fdump-rtl-sched1
-@opindex dS
+@item -fdump-rtl-sched1
@opindex fdump-rtl-sched1
Dump after the first scheduling pass, to @file{@var{file}.136r.sched1}.
-@item -dt
-@itemx -fdump-rtl-cse2
-@opindex dt
+@item -fdump-rtl-cse2
@opindex fdump-rtl-cse2
Dump after the second CSE pass (including the jump optimization that
sometimes follows CSE), to @file{@var{file}.127r.cse2}.
-@item -dT
-@itemx -fdump-rtl-tracer
-@opindex dT
+@item -fdump-rtl-tracer
@opindex fdump-rtl-tracer
Dump after running tracer, to @file{@var{file}.118r.tracer}.
-@item -dV
-@itemx -fdump-rtl-vpt
+@item -fdump-rtl-vpt
@itemx -fdump-rtl-vartrack
-@opindex dV
@opindex fdump-rtl-vpt
@opindex fdump-rtl-vartrack
-@option{-dV} and @option{-fdump-rtl-vpt} enable dumping after the value
-profile transformations, to @file{@var{file}.10.vpt}. @option{-dV}
-and @option{-fdump-rtl-vartrack} enable dumping after variable tracking,
+@option{-fdump-rtl-vpt} enable dumping after the value
+profile transformations, to @file{@var{file}.10.vpt}.
+@option{-fdump-rtl-vartrack} enable dumping after variable tracking,
to @file{@var{file}.154r.vartrack}.
-@item -dw
-@itemx -fdump-rtl-flow2
-@opindex dw
+@item -fdump-rtl-flow2
@opindex fdump-rtl-flow2
Dump after the second flow pass, to @file{@var{file}.142r.flow2}.
-@item -dz
-@itemx -fdump-rtl-peephole2
-@opindex dz
+@item -fdump-rtl-peephole2
@opindex fdump-rtl-peephole2
Dump after the peephole pass, to @file{@var{file}.145r.peephole2}.
-@item -dZ
-@itemx -fdump-rtl-web
-@opindex dZ
+@item -fdump-rtl-web
@opindex fdump-rtl-web
Dump after live range splitting, to @file{@var{file}.126r.web}.
-@item -da
-@itemx -fdump-rtl-all
-@opindex da
+@item -fdump-rtl-all
@opindex fdump-rtl-all
Produce all the dumps listed above.
@end table
+@item -fdump-statistics-@var{option}
+@opindex -fdump-statistics
+Enable and control dumping of pass statistics in a separate file. The
+file name is generated by appending a suffix ending in @samp{.statistics}
+to the source file name. If the @samp{-@var{option}} form is used,
+@samp{-stats} will cause counters to be summed over the whole compilation unit
+while @samp{-details} will dump every event as the passes generate them.
+The default with no option is to sum counters for each function compiled.
+
@item -fdump-tree-@var{switch}
@itemx -fdump-tree-@var{switch}-@var{options}
@opindex fdump-tree
Enable showing line numbers for statements.
@item uid
Enable showing the unique ID (@code{DECL_UID}) for each variable.
+@item verbose
+Enable showing the tree dump for each statement.
@item all
-Turn on all options, except @option{raw}, @option{slim} and @option{lineno}.
+Turn on all options, except @option{raw}, @option{slim}, @option{verbose}
+and @option{lineno}.
@end table
The following tree dumps are possible:
Dump SSA related information to a file. The file name is made by appending
@file{.ssa} to the source file name.
-@item salias
-@opindex fdump-tree-salias
-Dump structure aliasing variable information to a file. This file name
-is made by appending @file{.salias} to the source file name.
-
@item alias
@opindex fdump-tree-alias
Dump aliasing information for each function. The file name is made by
@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}
-ftree-ch @gol
-ftree-copyrename @gol
-ftree-dce @gol
+-ftree-builtin-dce @gol
-ftree-dominator-opts @gol
-ftree-dse @gol
-ftree-fre @gol
@opindex O3
Optimize yet more. @option{-O3} turns on all optimizations specified by
@option{-O2} and also turns on the @option{-finline-functions},
-@option{-funswitch-loops}, @option{-fpredictive-commoning} and
-@option{-fgcse-after-reload} options.
+@option{-funswitch-loops}, @option{-fpredictive-commoning},
+@option{-fgcse-after-reload} and @option{-ftree-vectorize} options.
@item -O0
@opindex O0
@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
copy operations. This flag is enabled by default at @option{-O} and
higher.
-@item -ftree-salias
-@opindex ftree-salias
-Perform structural alias analysis on trees. This flag
-is enabled by default at @option{-O} and higher.
-
@item -fipa-pure-const
@opindex fipa-pure-const
Discover which functions are pure or constant.
Perform dead code elimination (DCE) on trees. This flag is enabled by
default at @option{-O} and higher.
+@item -ftree-builtin-dce
+@opindex ftree-builtin-dce
+Perform conditional dead code elimination (DCE) for calls to builtin functions
+that may set errno but are otherwise side-effect free. This flag is enabled by
+default at @option{-O2} and higher.
+
@item -ftree-dominator-opts
@opindex ftree-dominator-opts
Perform a variety of simple scalar cleanups (constant/copy
Compare the results of several data dependence analyzers. This option
is used for debugging the data dependence analyzers.
+@item -ftree-loop-distribution
+Perform loop distribution. This flag can improve cache performance on
+big loop bodies and allow further loop optimizations, like
+parallelization or vectorization, to take place. For example, the loop
+@smallexample
+DO I = 1, N
+ A(I) = B(I) + C
+ D(I) = E(I) * F
+ENDDO
+@end smallexample
+is transformed to
+@smallexample
+DO I = 1, N
+ A(I) = B(I) + C
+ENDDO
+DO I = 1, N
+ D(I) = E(I) * F
+ENDDO
+@end smallexample
+
@item -ftree-loop-im
@opindex ftree-loop-im
Perform loop invariant motion on trees. This pass moves only invariants that
@item -ftree-vectorize
@opindex ftree-vectorize
-Perform loop vectorization on trees.
+Perform loop vectorization on trees. This flag is enabled by default at
+@option{-O3}.
@item -ftree-vect-loop-version
@opindex ftree-vect-loop-version
attempt to determine whether an operation on signed numbers will
overflow must be written carefully to not actually involve overflow.
+This option also allows the compiler to assume strict pointer
+semantics: given a pointer to an object, if adding an offset to that
+pointer does not produce a pointer to the same object, the addition is
+undefined. This permits the compiler to conclude that @code{p + u >
+p} is always true for a pointer @code{p} and unsigned integer
+@code{u}. This assumption is only valid because pointer wraparound is
+undefined, as the expression is false if @code{p + u} overflows using
+twos complement arithmetic.
+
See also the @option{-fwrapv} option. Using @option{-fwrapv} means
-that signed overflow is fully defined: it wraps. When
+that integer signed overflow is fully defined: it wraps. When
@option{-fwrapv} is used, there is no difference between
-@option{-fstrict-overflow} and @option{-fno-strict-overflow}. With
-@option{-fwrapv} certain types of overflow are permitted. For
-example, if the compiler gets an overflow when doing arithmetic on
-constants, the overflowed value can still be used with
+@option{-fstrict-overflow} and @option{-fno-strict-overflow} for
+integers. With @option{-fwrapv} certain types of overflow are
+permitted. For example, if the compiler gets an overflow when doing
+arithmetic on constants, the overflowed value can still be used with
@option{-fwrapv}, but not otherwise.
The @option{-fstrict-overflow} option is enabled at levels
Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}.
+@item -fprofile-dir=@var{path}
+@opindex fprofile-dir
+
+Set the directory to search the profile data files in to @var{path}.
+This option affects only the profile data generated by
+@option{-fprofile-generate}, @option{-ftest-coverage}, @option{-fprofile-arcs}
+and used by @option{-fprofile-use} and @option{-fbranch-probabilities}
+and its related options.
+By default, GCC will use the current directory as @var{path}
+thus the profile data file will appear in the same directory as the object file.
+
@item -fprofile-generate
+@itemx -fprofile-generate=@var{path}
@opindex fprofile-generate
Enable options usually used for instrumenting application to produce
The following options are enabled: @code{-fprofile-arcs}, @code{-fprofile-values}, @code{-fvpt}.
+If @var{path} is specified, GCC will look at the @var{path} to find
+the profile feeedback data files. See @option{-fprofile-dir}.
+
@item -fprofile-use
+@itemx -fprofile-use=@var{path}
@opindex fprofile-use
Enable profile feedback directed optimizations, and optimizations
generally profitable only with profile feedback available.
match the source code. This error can be turned into a warning by using
@option{-Wcoverage-mismatch}. Note this may result in poorly optimized
code.
+
+If @var{path} is specified, GCC will look at the @var{path} to find
+the profile feedback data files. See @option{-fprofile-dir}.
@end table
The following options control compiler behavior regarding floating
@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
all languages.
+@item -fcx-fortran-rules
+@opindex fcx-fortran-rules
+Complex multiplication and division follow Fortran rules. Range
+reduction is done as part of complex division, but 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-fortran-rules}.
+
@end table
The following options control optimizations that may improve
@var{name} are given in the following table:
@table @gcctabopt
-@item salias-max-implicit-fields
-The maximum number of fields in a variable without direct
-structure accesses for which structure aliasing will consider trying
-to track each field. The default is 5
-
-@item salias-max-array-elements
-The maximum number of elements an array can have and its elements
-still be tracked individually by structure aliasing. The default is 4
-
@item sra-max-structure-size
The maximum structure size, in bytes, at which the scalar replacement
of aggregates (SRA) optimization will perform block copies. The
Increasing values mean more aggressive optimization, making the compile time
increase with probably slightly better performance. The default value is 500.
-@item max-flow-memory-locations
-Similar as @option{max-cselib-memory-locations} but for dataflow liveness.
-The default value is 100.
-
@item reorder-blocks-duplicate
@itemx reorder-blocks-duplicate-feedback
@samp{arm10e}, @samp{arm1020e}, @samp{arm1022e},
@samp{arm1136j-s}, @samp{arm1136jf-s}, @samp{mpcore}, @samp{mpcorenovfp},
@samp{arm1156t2-s}, @samp{arm1176jz-s}, @samp{arm1176jzf-s},
-@samp{cortex-a8}, @samp{cortex-r4}, @samp{cortex-m3},
+@samp{cortex-a8}, @samp{cortex-r4}, @samp{cortex-m3}, @samp{cortex-m1},
@samp{xscale}, @samp{iwmmxt}, @samp{ep9312}.
-@itemx -mtune=@var{name}
+@item -mtune=@var{name}
@opindex mtune
This option is very similar to the @option{-mcpu=} option, except that
instead of specifying the actual target processor type, and hence
of the @option{-mcpu=} option. Permissible names are: @samp{armv2},
@samp{armv2a}, @samp{armv3}, @samp{armv3m}, @samp{armv4}, @samp{armv4t},
@samp{armv5}, @samp{armv5t}, @samp{armv5te}, @samp{armv6}, @samp{armv6j},
-@samp{armv6t2}, @samp{armv6z}, @samp{armv6zk}, @samp{armv7}, @samp{armv7-a},
-@samp{armv7-r}, @samp{armv7-m}, @samp{iwmmxt}, @samp{ep9312}.
+@samp{armv6t2}, @samp{armv6z}, @samp{armv6zk}, @samp{armv6-m},
+@samp{armv7}, @samp{armv7-a}, @samp{armv7-r}, @samp{armv7-m},
+@samp{iwmmxt}, @samp{ep9312}.
@item -mfpu=@var{name}
@itemx -mfpe=@var{number}
@opindex minline-plt
Enable inlining of PLT entries in function calls to functions that are
not known to bind locally. It has no effect without @option{-mfdpic}.
-@end table
+@item -mmulticore
+@opindex mmulticore
+Build standalone application for multicore Blackfin processor. Proper
+start files and link scripts will be used to support multicore.
+This option defines @code{__BFIN_MULTICORE}. It can only be used with
+@option{-mcpu=bf561@r{[}-@var{sirevision}@r{]}}. It can be used with
+@option{-mcorea} or @option{-mcoreb}. If it's used without
+@option{-mcorea} or @option{-mcoreb}, single application/dual core
+programming model is used. In this model, the main function of Core B
+should be named as coreb_main. If it's used with @option{-mcorea} or
+@option{-mcoreb}, one application per core programming model is used.
+If this option is not used, single core application programming
+model is used.
+
+@item -mcorea
+@opindex mcorea
+Build standalone application for Core A of BF561 when using
+one application per core programming model. Proper start files
+and link scripts will be used to support Core A. This option
+defines @code{__BFIN_COREA}. It must be used with @option{-mmulticore}.
+
+@item -mcoreb
+@opindex mcoreb
+Build standalone application for Core B of BF561 when using
+one application per core programming model. Proper start files
+and link scripts will be used to support Core B. This option
+defines @code{__BFIN_COREB}. When this option is used, coreb_main
+should be used instead of main. It must be used with
+@option{-mmulticore}.
+
+@item -msdram
+@opindex msdram
+Build standalone application for SDRAM. Proper start files and
+link scripts will be used to put the application into SDRAM.
+Loader should initialize SDRAM before loading the application
+into SDRAM. This option defines @code{__BFIN_SDRAM}.
+@end table
+
@node CRIS Options
@subsection CRIS Options
@cindex CRIS Options
@itemx -unexported_symbols_list
@itemx -weak_reference_mismatches
@itemx -whatsloaded
-
@opindex allowable_client
@opindex client_name
@opindex compatibility_version
@opindex unexported_symbols_list
@opindex weak_reference_mismatches
@opindex whatsloaded
-
These options are passed to the Darwin linker. The Darwin linker man page
describes them in detail.
@end table
@item -mmmx
@itemx -mno-mmx
-@item -msse
+@itemx -msse
@itemx -mno-sse
-@item -msse2
+@itemx -msse2
@itemx -mno-sse2
-@item -msse3
+@itemx -msse3
@itemx -mno-sse3
-@item -mssse3
+@itemx -mssse3
@itemx -mno-ssse3
-@item -msse4.1
+@itemx -msse4.1
@itemx -mno-sse4.1
-@item -msse4.2
+@itemx -msse4.2
@itemx -mno-sse4.2
-@item -msse4
+@itemx -msse4
@itemx -mno-sse4
-@item -msse4a
-@item -mno-sse4a
-@item -msse5
+@itemx -maes
+@itemx -mno-aes
+@itemx -mpclmul
+@itemx -mno-pclmul
+@itemx -msse4a
+@itemx -mno-sse4a
+@itemx -msse5
@itemx -mno-sse5
-@item -m3dnow
+@itemx -m3dnow
@itemx -mno-3dnow
-@item -mpopcnt
+@itemx -mpopcnt
@itemx -mno-popcnt
-@item -mabm
+@itemx -mabm
@itemx -mno-abm
@opindex mmmx
@opindex mno-mmx
@opindex m3dnow
@opindex mno-3dnow
These switches enable or disable the use of instructions in the MMX,
-SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4A, SSE5, ABM or 3DNow!@: extended
-instruction sets.
+SSE, SSE2, SSE3, SSSE3, SSE4.1, AES, PCLMUL, SSE4A, SSE5, ABM or
+3DNow!@: extended instruction sets.
These extensions are also available as built-in functions: see
@ref{X86 Built-in Functions}, for details of the functions enabled and
disabled by these switches.
@item -mveclibabi=@var{type}
@opindex mveclibabi
Specifies the ABI type to use for vectorizing intrinsics using an
-external library. Supported types are @code{acml} for the AMD
-math core library style of interfacing. GCC will currently emit
-calls to @code{__vrd2_sin}, @code{__vrd2_cos}, @code{__vrd2_exp},
-@code{__vrd2_log}, @code{__vrd2_log2}, @code{__vrd2_log10},
-@code{__vrs4_sinf}, @code{__vrs4_cosf}, @code{__vrs4_expf},
-@code{__vrs4_logf}, @code{__vrs4_log2f}, @code{__vrs4_log10f}
-and @code{__vrs4_powf} when using this type and @option{-ftree-vectorize}
-is enabled. A ACML ABI compatible library will have to be specified
-at link time.
+external library. Supported types are @code{svml} for the Intel short
+vector math library and @code{acml} for the AMD math core library style
+of interfacing. GCC will currently emit calls to @code{vmldExp2},
+@code{vmldLn2}, @code{vmldLog102}, @code{vmldLog102}, @code{vmldPow2},
+@code{vmldTanh2}, @code{vmldTan2}, @code{vmldAtan2}, @code{vmldAtanh2},
+@code{vmldCbrt2}, @code{vmldSinh2}, @code{vmldSin2}, @code{vmldAsinh2},
+@code{vmldAsin2}, @code{vmldCosh2}, @code{vmldCos2}, @code{vmldAcosh2},
+@code{vmldAcos2}, @code{vmlsExp4}, @code{vmlsLn4}, @code{vmlsLog104},
+@code{vmlsLog104}, @code{vmlsPow4}, @code{vmlsTanh4}, @code{vmlsTan4},
+@code{vmlsAtan4}, @code{vmlsAtanh4}, @code{vmlsCbrt4}, @code{vmlsSinh4},
+@code{vmlsSin4}, @code{vmlsAsinh4}, @code{vmlsAsin4}, @code{vmlsCosh4},
+@code{vmlsCos4}, @code{vmlsAcosh4} and @code{vmlsAcos4} for corresponding
+function type when @option{-mveclibabi=svml} is used and @code{__vrd2_sin},
+@code{__vrd2_cos}, @code{__vrd2_exp}, @code{__vrd2_log}, @code{__vrd2_log2},
+@code{__vrd2_log10}, @code{__vrs4_sinf}, @code{__vrs4_cosf},
+@code{__vrs4_expf}, @code{__vrs4_logf}, @code{__vrs4_log2f},
+@code{__vrs4_log10f} and @code{__vrs4_powf} for corresponding function type
+when @option{-mveclibabi=acml} is used. Both @option{-ftree-vectorize} and
+@option{-funsafe-math-optimizations} have to be enabled. A SVML or ACML ABI
+compatible library will have to be specified at link time.
@item -mpush-args
@itemx -mno-push-args
@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,
@samp{601}, @samp{602}, @samp{603}, @samp{603e}, @samp{604},
@samp{604e}, @samp{620}, @samp{630}, @samp{740}, @samp{7400},
@samp{7450}, @samp{750}, @samp{801}, @samp{821}, @samp{823},
-@samp{860}, @samp{970}, @samp{8540}, @samp{ec603e}, @samp{G3},
-@samp{G4}, @samp{G5}, @samp{power}, @samp{power2}, @samp{power3},
-@samp{power4}, @samp{power5}, @samp{power5+}, @samp{power6},
-@samp{power6x}, @samp{common}, @samp{powerpc}, @samp{powerpc64},
-@samp{rios}, @samp{rios1}, @samp{rios2}, @samp{rsc}, and @samp{rs64}.
+@samp{860}, @samp{970}, @samp{8540}, @samp{e300c2}, @samp{e300c3},
+@samp{ec603e}, @samp{G3}, @samp{G4}, @samp{G5}, @samp{power},
+@samp{power2}, @samp{power3}, @samp{power4}, @samp{power5},
+@samp{power5+}, @samp{power6}, @samp{power6x}, @samp{common},
+@samp{powerpc}, @samp{powerpc64}, @samp{rios}, @samp{rios1},
+@samp{rios2}, @samp{rsc}, and @samp{rs64}.
@option{-mcpu=common} selects a completely generic processor. Code
generated under this option will run on any POWER or PowerPC processor.
enhancements.
@item -mvrsave
-@item -mno-vrsave
+@itemx -mno-vrsave
@opindex mvrsave
@opindex mno-vrsave
Generate VRSAVE instructions when generating AltiVec code.
@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
The default is to not maintain the backchain.
@item -mpacked-stack
-@item -mno-packed-stack
+@itemx -mno-packed-stack
@opindex mpacked-stack
@opindex mno-packed-stack
Use (do not use) the packed stack layout. When @option{-mno-packed-stack} is
sized arrays. This is generally a bad idea with a limited stack size.
@item -mstack-guard=@var{stack-guard}
-@item -mstack-size=@var{stack-size}
+@itemx -mstack-size=@var{stack-size}
@opindex mstack-guard
@opindex mstack-size
If these options are provided the s390 back end emits additional instructions in
Use 32-bit offsets in @code{switch} tables. The default is to use
16-bit offsets.
+@item -mbitops
+@opindex mbitops
+Enable the use of bit manipulation instructions on SH2A.
+
@item -mfmovd
@opindex mfmovd
Enable the use of the instruction @code{fmovd}.
sensitive to the compiler's ability to combine multiply and add/subtract
operations.
+@item -mserialize-volatile
+@itemx -mno-serialize-volatile
+@opindex mserialize-volatile
+@opindex mno-serialize-volatile
+When this option is enabled, GCC inserts @code{MEMW} instructions before
+@code{volatile} memory references to guarantee sequential consistency.
+The default is @option{-mserialize-volatile}. Use
+@option{-mno-serialize-volatile} to omit the @code{MEMW} instructions.
+
@item -mtext-section-literals
@itemx -mno-text-section-literals
@opindex mtext-section-literals
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