### 3.1 Option Summary

Here is a summary of all the options, grouped by type. Explanations are in the following sections.

Overall Options
  See Options Controlling the Kind of Output.

                -c  -S  -E  -o file  -combine -pipe  -pass-exit-codes
                -x language  -v  -###  --help  --target-help  --version

C Language Options
  See Options Controlling C Dialect.

                -ansi  -std=standard  -aux-info filename
                -fno-asm  -fno-builtin  -fno-builtin-function
                -fhosted  -ffreestanding  -fms-extensions
                -trigraphs  -no-integrated-cpp  -traditional  -traditional-cpp
                -fallow-single-precision  -fcond-mismatch
                -fsigned-bitfields  -fsigned-char
                -funsigned-bitfields  -funsigned-char

C++ Language Options
  See Options Controlling C++ Dialect.

                -fabi-version=n  -fno-access-control  -fcheck-new
                -fconserve-space  -ffriend-injection  -fno-const-strings
                -fno-elide-constructors
                -fno-enforce-eh-specs
                -ffor-scope  -fno-for-scope  -fno-gnu-keywords
                -fno-implicit-templates
                -fno-implicit-inline-templates
                -fno-implement-inlines  -fms-extensions
                -fno-nonansi-builtins  -fno-operator-names
                -fno-optional-diags  -fpermissive
                -frepo  -fno-rtti  -fstats  -ftemplate-depth-n
                -fno-threadsafe-statics -fuse-cxa-atexit  -fno-weak  -nostdinc++
                -fno-default-inline  -fvisibility-inlines-hidden
                -Wabi  -Wctor-dtor-privacy
                -Wnon-virtual-dtor  -Wreorder
                -Weffc++  -Wno-deprecated  -Wstrict-null-sentinel
                -Wno-non-template-friend  -Wold-style-cast
                -Woverloaded-virtual  -Wno-pmf-conversions
                -Wsign-promo

Objective-C and Objective-C++ Language Options
  See Options Controlling Objective-C and Objective-C++ Dialects.

                -fconstant-string-class=class-name
                -fgnu-runtime  -fnext-runtime
                -fno-nil-receivers
                -fobjc-call-cxx-cdtors
                -fobjc-direct-dispatch
                -fobjc-exceptions
                -fobjc-gc
                -freplace-objc-classes
                -fzero-link
                -gen-decls
                -Wassign-intercept
                -Wno-protocol  -Wselector
                -Wstrict-selector-match
                -Wundeclared-selector

Language Independent Options
  See Options to Control Diagnostic Messages Formatting.

                -fmessage-length=n
                -fdiagnostics-show-location=[once|every-line]

  -fdiagnostics-show-options

Warning Options
  See Options to Request or Suppress Warnings.

                -fsyntax-only  -pedantic  -pedantic-errors
                -w  -Wextra  -Wall  -Waggregate-return -Wno-attributes
                -Wc++-compat -Wcast-align  -Wcast-qual  -Wchar-subscripts  -Wcomment
                -Wconversion  -Wno-deprecated-declarations
                -Wdisabled-optimization  -Wno-div-by-zero  -Wno-endif-labels
                -Werror  -Werror-implicit-function-declaration
                -Wfatal-errors  -Wfloat-equal  -Wformat  -Wformat=2
                -Wno-format-extra-args -Wformat-nonliteral
                -Wformat-security  -Wformat-y2k
                -Wimplicit  -Wimplicit-function-declaration  -Wimplicit-int
                -Wimport  -Wno-import  -Winit-self  -Winline
                -Wno-int-to-pointer-cast
                -Wno-invalid-offsetof  -Winvalid-pch
                -Wlarger-than-len  -Wunsafe-loop-optimizations  -Wlong-long
                -Wmain  -Wmissing-braces  -Wmissing-field-initializers
                -Wmissing-format-attribute  -Wmissing-include-dirs
                -Wmissing-noreturn
                -Wno-multichar  -Wnonnull  -Wpacked  -Wpadded
                -Wparentheses  -Wpointer-arith  -Wno-pointer-to-int-cast
                -Wredundant-decls
                -Wreturn-type  -Wsequence-point  -Wshadow
                -Wsign-compare  -Wstack-protector
                -Wstrict-aliasing -Wstrict-aliasing=2
                -Wswitch  -Wswitch-default  -Wswitch-enum
                -Wsystem-headers  -Wtrigraphs  -Wundef  -Wuninitialized
                -Wunknown-pragmas  -Wno-pragmas -Wunreachable-code
                -Wunused  -Wunused-function  -Wunused-label  -Wunused-parameter
                -Wunused-value  -Wunused-variable  -Wvariadic-macros
                -Wvolatile-register-var  -Wwrite-strings

C-only Warning Options

                -Wbad-function-cast  -Wmissing-declarations
                -Wmissing-prototypes  -Wnested-externs  -Wold-style-definition
                -Wstrict-prototypes  -Wtraditional
                -Wdeclaration-after-statement -Wpointer-sign

Debugging Options
  See Options for Debugging Your Program or GCC.

                -dletters  -dumpspecs  -dumpmachine  -dumpversion
                -fdump-unnumbered  -fdump-translation-unit[-n
                ]
                -fdump-class-hierarchy[-n
                ]
                -fdump-ipa-all -fdump-ipa-cgraph
                -fdump-tree-all
                -fdump-tree-original[-n
                ]
                -fdump-tree-optimized[-n
                ]
                -fdump-tree-inlined[-n
                ]
                -fdump-tree-cfg -fdump-tree-vcg -fdump-tree-alias
                -fdump-tree-ch
                -fdump-tree-ssa[-n
                ] -fdump-tree-pre[-n
                ]
                -fdump-tree-ccp[-n
                ] -fdump-tree-dce[-n
                ]
                -fdump-tree-gimple[-raw] -fdump-tree-mudflap[-n
                ]
                -fdump-tree-dom[-n
                ]
                -fdump-tree-dse[-n
                ]
                -fdump-tree-phiopt[-n
                ]
                -fdump-tree-forwprop[-n
                ]
                -fdump-tree-copyrename[-n
                ]
                -fdump-tree-nrv -fdump-tree-vect
                -fdump-tree-sink
                -fdump-tree-sra[-n
                ]
                -fdump-tree-salias
                -fdump-tree-fre[-n
                ]
                -fdump-tree-vrp[-n
                ]
                -ftree-vectorizer-verbose=n
                -fdump-tree-storeccp[-n
                ]
                -feliminate-dwarf2-dups -feliminate-unused-debug-types
                -feliminate-unused-debug-symbols -fmem-report -fprofile-arcs
                -frandom-seed=string -fsched-verbose=n
                -ftest-coverage  -ftime-report -fvar-tracking
                -g  -glevel  -gcoff -gdwarf-2
                -ggdb  -gstabs  -gstabs+  -gvms  -gxcoff  -gxcoff+
                -p  -pg  -print-file-name=library  -print-libgcc-file-name
                -print-multi-directory  -print-multi-lib
                -print-prog-name=program  -print-search-dirs  -Q
                -save-temps  -time

Optimization Options
  See Options that Control Optimization.

                -falign-functions=n  -falign-jumps=n
                -falign-labels=n  -falign-loops=n
                -fbounds-check -fmudflap -fmudflapth -fmudflapir
                -fbranch-probabilities -fprofile-values -fvpt -fbranch-target-load-optimize
                -fbranch-target-load-optimize2 -fbtr-bb-exclusive
                -fcaller-saves  -fcprop-registers  -fcse-follow-jumps
                -fcse-skip-blocks  -fcx-limited-range  -fdata-sections
                -fdelayed-branch  -fdelete-null-pointer-checks -fearly-inlining
                -fexpensive-optimizations  -ffast-math  -ffloat-store
                -fforce-addr  -ffunction-sections
                -fgcse  -fgcse-lm  -fgcse-sm  -fgcse-las  -fgcse-after-reload
                -floop-optimize -fcrossjumping  -fif-conversion  -fif-conversion2
                -finline-functions  -finline-functions-called-once
                -finline-limit=n  -fkeep-inline-functions
                -fkeep-static-consts  -fmerge-constants  -fmerge-all-constants
                -fmodulo-sched -fno-branch-count-reg
                -fno-default-inline  -fno-defer-pop -floop-optimize2 -fmove-loop-invariants
                -fno-function-cse  -fno-guess-branch-probability
                -fno-inline  -fno-math-errno  -fno-peephole  -fno-peephole2
                -funsafe-math-optimizations  -funsafe-loop-optimizations  -ffinite-math-only
                -fno-trapping-math  -fno-zero-initialized-in-bss
                -fomit-frame-pointer  -foptimize-register-move
                -foptimize-sibling-calls  -fprefetch-loop-arrays
                -fprofile-generate -fprofile-use
                -fregmove  -frename-registers
                -freorder-blocks  -freorder-blocks-and-partition -freorder-functions
                -frerun-cse-after-loop  -frerun-loop-opt
                -frounding-math -fschedule-insns  -fschedule-insns2
                -fno-sched-interblock  -fno-sched-spec  -fsched-spec-load
                -fsched-spec-load-dangerous
                -fsched-stalled-insns=n -fsched-stalled-insns-dep=n
                -fsched2-use-superblocks
                -fsched2-use-traces -freschedule-modulo-scheduled-loops
                -fsignaling-nans -fsingle-precision-constant
                -fstack-protector  -fstack-protector-all
                -fstrength-reduce  -fstrict-aliasing  -ftracer  -fthread-jumps
                -funroll-all-loops  -funroll-loops  -fpeel-loops
                -fsplit-ivs-in-unroller -funswitch-loops
                -fvariable-expansion-in-unroller
                -ftree-pre  -ftree-ccp  -ftree-dce -ftree-loop-optimize
                -ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts
                -ftree-dominator-opts -ftree-dse -ftree-copyrename -ftree-sink
                -ftree-ch -ftree-sra -ftree-ter -ftree-lrs -ftree-fre -ftree-vectorize
                -ftree-vect-loop-version -ftree-salias -fweb
                -ftree-copy-prop -ftree-store-ccp -ftree-store-copy-prop -fwhole-program
                --param name=value
                -O  -O0  -O1  -O2  -O3  -Os

Preprocessor Options
  See Options Controlling the Preprocessor.

                -Aquestion=answer
                -A-question
                [=answer
                ]
                -C  -dD  -dI  -dM  -dN
                -Dmacro
                [=defn
                ]  -E  -H
                -idirafter dir
                -include file  -imacros file
                -iprefix file  -iwithprefix dir
                -iwithprefixbefore dir  -isystem dir
                -isysroot dir
                -M  -MM  -MF  -MG  -MP  -MQ  -MT  -nostdinc
                -P  -fworking-directory  -remap
                -trigraphs  -undef  -Umacro  -Wp,option
                -Xpreprocessor option

Assembler Option
  See Passing Options to the Assembler.

                -Wa,option  -Xassembler option

Linker Options
  See Options for Linking.

                object-file-name  -llibrary
                -nostartfiles  -nodefaultlibs  -nostdlib -pie -rdynamic
                -s  -static  -static-libgcc  -shared  -shared-libgcc  -symbolic
                -Wl,option  -Xlinker option
                -u symbol

Directory Options
  See Options for Directory Search.

                -Bprefix  -Idir  -iquotedir  -Ldir
                -specs=file  -I- --sysroot=dir

Target Options
  See Target Options.

                -V version  -b machine

Machine Dependent Options
  See Hardware Models and Configurations.

  ARC Options

                -EB  -EL
                -mmangle-cpu  -mcpu=cpu  -mtext=text-section
                -mdata=data-section  -mrodata=readonly-data-section

  ARM Options

                -mapcs-frame  -mno-apcs-frame
                -mabi=name
                -mapcs-stack-check  -mno-apcs-stack-check
                -mapcs-float  -mno-apcs-float
                -mapcs-reentrant  -mno-apcs-reentrant
                -msched-prolog  -mno-sched-prolog
                -mlittle-endian  -mbig-endian  -mwords-little-endian
                -mfloat-abi=name  -msoft-float  -mhard-float  -mfpe
                -mthumb-interwork  -mno-thumb-interwork
                -mcpu=name  -march=name  -mfpu=name
                -mstructure-size-boundary=n
                -mabort-on-noreturn
                -mlong-calls  -mno-long-calls
                -msingle-pic-base  -mno-single-pic-base
                -mpic-register=reg
                -mnop-fun-dllimport
                -mcirrus-fix-invalid-insns -mno-cirrus-fix-invalid-insns
                -mpoke-function-name
                -mthumb  -marm
                -mtpcs-frame  -mtpcs-leaf-frame
                -mcaller-super-interworking  -mcallee-super-interworking
                -mtp=name

  AVR Options

                -mmcu=mcu  -msize  -minit-stack=n  -mno-interrupts
                -mcall-prologues  -mno-tablejump  -mtiny-stack  -mint8

  Blackfin Options

                -momit-leaf-frame-pointer -mno-omit-leaf-frame-pointer
                -mspecld-anomaly -mno-specld-anomaly -mcsync-anomaly -mno-csync-anomaly
                -mlow-64k -mno-low64k -mid-shared-library
                -mno-id-shared-library -mshared-library-id=n
                -mlong-calls  -mno-long-calls

  CRIS Options

                -mcpu=cpu  -march=cpu  -mtune=cpu
                -mmax-stack-frame=n  -melinux-stacksize=n
                -metrax4  -metrax100  -mpdebug  -mcc-init  -mno-side-effects
                -mstack-align  -mdata-align  -mconst-align
                -m32-bit  -m16-bit  -m8-bit  -mno-prologue-epilogue  -mno-gotplt
                -melf  -maout  -melinux  -mlinux  -sim  -sim2
                -mmul-bug-workaround  -mno-mul-bug-workaround

  CRX Options

                -mmac -mpush-args

  Darwin Options

                -all_load  -allowable_client  -arch  -arch_errors_fatal
                -arch_only  -bind_at_load  -bundle  -bundle_loader
                -client_name  -compatibility_version  -current_version
                -dead_strip
                -dependency-file  -dylib_file  -dylinker_install_name
                -dynamic  -dynamiclib  -exported_symbols_list
                -filelist  -flat_namespace  -force_cpusubtype_ALL
                -force_flat_namespace  -headerpad_max_install_names
                -image_base  -init  -install_name  -keep_private_externs
                -multi_module  -multiply_defined  -multiply_defined_unused
                -noall_load   -no_dead_strip_inits_and_terms
                -nofixprebinding -nomultidefs  -noprebind  -noseglinkedit
                -pagezero_size  -prebind  -prebind_all_twolevel_modules
                -private_bundle  -read_only_relocs  -sectalign
                -sectobjectsymbols  -whyload  -seg1addr
                -sectcreate  -sectobjectsymbols  -sectorder
                -segaddr -segs_read_only_addr -segs_read_write_addr
                -seg_addr_table  -seg_addr_table_filename  -seglinkedit
                -segprot  -segs_read_only_addr  -segs_read_write_addr
                -single_module  -static  -sub_library  -sub_umbrella
                -twolevel_namespace  -umbrella  -undefined
                -unexported_symbols_list  -weak_reference_mismatches
                -whatsloaded -F -gused -gfull -mmacosx-version-min=version
                -mone-byte-bool

  DEC Alpha Options

                -mno-fp-regs  -msoft-float  -malpha-as  -mgas
                -mieee  -mieee-with-inexact  -mieee-conformant
                -mfp-trap-mode=mode  -mfp-rounding-mode=mode
                -mtrap-precision=mode  -mbuild-constants
                -mcpu=cpu-type  -mtune=cpu-type
                -mbwx  -mmax  -mfix  -mcix
                -mfloat-vax  -mfloat-ieee
                -mexplicit-relocs  -msmall-data  -mlarge-data
                -msmall-text  -mlarge-text
                -mmemory-latency=time

  DEC Alpha/VMS Options

                -mvms-return-codes

  FRV Options

                -mgpr-32  -mgpr-64  -mfpr-32  -mfpr-64
                -mhard-float  -msoft-float
                -malloc-cc  -mfixed-cc  -mdword  -mno-dword
                -mdouble  -mno-double
                -mmedia  -mno-media  -mmuladd  -mno-muladd
                -mfdpic  -minline-plt -mgprel-ro  -multilib-library-pic
                -mlinked-fp  -mlong-calls  -malign-labels
                -mlibrary-pic  -macc-4  -macc-8
                -mpack  -mno-pack  -mno-eflags  -mcond-move  -mno-cond-move
                -moptimize-membar -mno-optimize-membar
                -mscc  -mno-scc  -mcond-exec  -mno-cond-exec
                -mvliw-branch  -mno-vliw-branch
                -mmulti-cond-exec  -mno-multi-cond-exec  -mnested-cond-exec
                -mno-nested-cond-exec  -mtomcat-stats
                -mTLS -mtls
                -mcpu=cpu

  H8/300 Options

                -mrelax  -mh  -ms  -mn  -mint32  -malign-300

  HPPA Options

                -march=architecture-type
                -mbig-switch  -mdisable-fpregs  -mdisable-indexing
                -mfast-indirect-calls  -mgas  -mgnu-ld   -mhp-ld
                -mfixed-range=register-range
                -mjump-in-delay -mlinker-opt -mlong-calls
                -mlong-load-store  -mno-big-switch  -mno-disable-fpregs
                -mno-disable-indexing  -mno-fast-indirect-calls  -mno-gas
                -mno-jump-in-delay  -mno-long-load-store
                -mno-portable-runtime  -mno-soft-float
                -mno-space-regs  -msoft-float  -mpa-risc-1-0
                -mpa-risc-1-1  -mpa-risc-2-0  -mportable-runtime
                -mschedule=cpu-type  -mspace-regs  -msio  -mwsio
                -munix=unix-std  -nolibdld  -static  -threads

  i386 and x86-64 Options

                -mtune=cpu-type  -march=cpu-type
                -mfpmath=unit
                -masm=dialect  -mno-fancy-math-387
                -mno-fp-ret-in-387  -msoft-float  -msvr3-shlib
                -mno-wide-multiply  -mrtd  -malign-double
                -mpreferred-stack-boundary=num
                -mmmx  -msse  -msse2 -msse3 -m3dnow
                -mthreads  -mno-align-stringops  -minline-all-stringops
                -mpush-args  -maccumulate-outgoing-args  -m128bit-long-double
                -m96bit-long-double  -mregparm=num  -msseregparm
                -momit-leaf-frame-pointer  -mno-red-zone -mno-tls-direct-seg-refs
                -mcmodel=code-model
                -m32  -m64 -mlarge-data-threshold=num

  IA-64 Options

                -mbig-endian  -mlittle-endian  -mgnu-as  -mgnu-ld  -mno-pic
                -mvolatile-asm-stop  -mregister-names  -mno-sdata
                -mconstant-gp  -mauto-pic  -minline-float-divide-min-latency
                -minline-float-divide-max-throughput
                -minline-int-divide-min-latency
                -minline-int-divide-max-throughput
                -minline-sqrt-min-latency -minline-sqrt-max-throughput
                -mno-dwarf2-asm -mearly-stop-bits
                -mfixed-range=register-range -mtls-size=tls-size
                -mtune=cpu-type -mt -pthread -milp32 -mlp64

  M32R/D Options

                -m32r2 -m32rx -m32r
                -mdebug
                -malign-loops -mno-align-loops
                -missue-rate=number
                -mbranch-cost=number
                -mmodel=code-size-model-type
                -msdata=sdata-type
                -mno-flush-func -mflush-func=name
                -mno-flush-trap -mflush-trap=number
                -G num

  M32C Options

                -mcpu=cpu -msim -memregs=number

  M680x0 Options

                -m68000  -m68020  -m68020-40  -m68020-60  -m68030  -m68040
                -m68060  -mcpu32  -m5200  -m68881  -mbitfield  -mc68000  -mc68020
                -mnobitfield  -mrtd  -mshort  -msoft-float  -mpcrel
                -malign-int  -mstrict-align  -msep-data  -mno-sep-data
                -mshared-library-id=n  -mid-shared-library  -mno-id-shared-library

  M68hc1x Options

                -m6811  -m6812  -m68hc11  -m68hc12   -m68hcs12
                -mauto-incdec  -minmax  -mlong-calls  -mshort
                -msoft-reg-count=count

  MCore Options

                -mhardlit  -mno-hardlit  -mdiv  -mno-div  -mrelax-immediates
                -mno-relax-immediates  -mwide-bitfields  -mno-wide-bitfields
                -m4byte-functions  -mno-4byte-functions  -mcallgraph-data
                -mno-callgraph-data  -mslow-bytes  -mno-slow-bytes  -mno-lsim
                -mlittle-endian  -mbig-endian  -m210  -m340  -mstack-increment

  MIPS Options

                -EL  -EB  -march=arch  -mtune=arch
                -mips1  -mips2  -mips3  -mips4  -mips32  -mips32r2  -mips64
                -mips16  -mno-mips16  -mabi=abi  -mabicalls  -mno-abicalls
                -mxgot  -mno-xgot  -mgp32  -mgp64  -mfp32  -mfp64
                -mhard-float  -msoft-float  -msingle-float  -mdouble-float
                -mdsp  -mpaired-single  -mips3d
                -mlong64  -mlong32  -msym32  -mno-sym32
                -Gnum  -membedded-data  -mno-embedded-data
                -muninit-const-in-rodata  -mno-uninit-const-in-rodata
                -msplit-addresses  -mno-split-addresses
                -mexplicit-relocs  -mno-explicit-relocs
                -mcheck-zero-division  -mno-check-zero-division
                -mdivide-traps  -mdivide-breaks
                -mmemcpy  -mno-memcpy  -mlong-calls  -mno-long-calls
                -mmad  -mno-mad  -mfused-madd  -mno-fused-madd  -nocpp
                -mfix-r4000  -mno-fix-r4000  -mfix-r4400  -mno-fix-r4400
                -mfix-vr4120  -mno-fix-vr4120  -mfix-vr4130
                -mfix-sb1  -mno-fix-sb1
                -mflush-func=func  -mno-flush-func
                -mbranch-likely  -mno-branch-likely
                -mfp-exceptions -mno-fp-exceptions
                -mvr4130-align -mno-vr4130-align

  MMIX Options

                -mlibfuncs  -mno-libfuncs  -mepsilon  -mno-epsilon  -mabi=gnu
                -mabi=mmixware  -mzero-extend  -mknuthdiv  -mtoplevel-symbols
                -melf  -mbranch-predict  -mno-branch-predict  -mbase-addresses
                -mno-base-addresses  -msingle-exit  -mno-single-exit

  MN10300 Options

                -mmult-bug  -mno-mult-bug
                -mam33  -mno-am33
                -mam33-2  -mno-am33-2
                -mreturn-pointer-on-d0
                -mno-crt0  -mrelax

  MT Options

                -mno-crt0 -mbacc -msim
                -march=cpu-type

  PDP-11 Options

                -mfpu  -msoft-float  -mac0  -mno-ac0  -m40  -m45  -m10
                -mbcopy  -mbcopy-builtin  -mint32  -mno-int16
                -mint16  -mno-int32  -mfloat32  -mno-float64
                -mfloat64  -mno-float32  -mabshi  -mno-abshi
                -mbranch-expensive  -mbranch-cheap
                -msplit  -mno-split  -munix-asm  -mdec-asm

  PowerPC Options See RS/6000 and PowerPC Options.

  RS/6000 and PowerPC Options

                -mcpu=cpu-type
                -mtune=cpu-type
                -mpower  -mno-power  -mpower2  -mno-power2
                -mpowerpc  -mpowerpc64  -mno-powerpc
                -maltivec  -mno-altivec
                -mpowerpc-gpopt  -mno-powerpc-gpopt
                -mpowerpc-gfxopt  -mno-powerpc-gfxopt
                -mmfcrf  -mno-mfcrf  -mpopcntb  -mno-popcntb  -mfprnd  -mno-fprnd
                -mnew-mnemonics  -mold-mnemonics
                -mfull-toc   -mminimal-toc  -mno-fp-in-toc  -mno-sum-in-toc
                -m64  -m32  -mxl-compat  -mno-xl-compat  -mpe
                -malign-power  -malign-natural
                -msoft-float  -mhard-float  -mmultiple  -mno-multiple
                -mstring  -mno-string  -mupdate  -mno-update
                -mfused-madd  -mno-fused-madd  -mbit-align  -mno-bit-align
                -mstrict-align  -mno-strict-align  -mrelocatable
                -mno-relocatable  -mrelocatable-lib  -mno-relocatable-lib
                -mtoc  -mno-toc  -mlittle  -mlittle-endian  -mbig  -mbig-endian
                -mdynamic-no-pic  -maltivec  -mswdiv
                -mprioritize-restricted-insns=priority
                -msched-costly-dep=dependence_type
                -minsert-sched-nops=scheme
                -mcall-sysv  -mcall-netbsd
                -maix-struct-return  -msvr4-struct-return
                -mabi=abi-type -msecure-plt -mbss-plt
                -misel -mno-isel
                -misel=yes  -misel=no
                -mspe -mno-spe
                -mspe=yes  -mspe=no
                -mvrsave -mno-vrsave
                -mfloat-gprs=yes  -mfloat-gprs=no -mfloat-gprs=single -mfloat-gprs=double
                -mprototype  -mno-prototype
                -msim  -mmvme  -mads  -myellowknife  -memb  -msdata
                -msdata=opt  -mvxworks  -mwindiss  -G num  -pthread

  S/390 and zSeries Options

                -mtune=cpu-type  -march=cpu-type
                -mhard-float  -msoft-float -mlong-double-64 -mlong-double-128
                -mbackchain  -mno-backchain -mpacked-stack  -mno-packed-stack
                -msmall-exec  -mno-small-exec  -mmvcle -mno-mvcle
                -m64  -m31  -mdebug  -mno-debug  -mesa  -mzarch
                -mtpf-trace -mno-tpf-trace  -mfused-madd  -mno-fused-madd
                -mwarn-framesize  -mwarn-dynamicstack  -mstack-size -mstack-guard

  SH Options

                -m1  -m2  -m2e  -m3  -m3e
                -m4-nofpu  -m4-single-only  -m4-single  -m4
                -m4a-nofpu -m4a-single-only -m4a-single -m4a -m4al
                -m5-64media  -m5-64media-nofpu
                -m5-32media  -m5-32media-nofpu
                -m5-compact  -m5-compact-nofpu
                -mb  -ml  -mdalign  -mrelax
                -mbigtable  -mfmovd  -mhitachi -mrenesas -mno-renesas -mnomacsave
                -mieee  -misize  -mpadstruct  -mspace
                -mprefergot  -musermode -multcost=number -mdiv=strategy
                -mdivsi3_libfunc=name
                -madjust-unroll -mindexed-addressing -mgettrcost=number -mpt-fixed
                 -minvalid-symbols

  SPARC Options

                -mcpu=cpu-type
                -mtune=cpu-type
                -mcmodel=code-model
                -m32  -m64  -mapp-regs  -mno-app-regs
                -mfaster-structs  -mno-faster-structs
                -mfpu  -mno-fpu  -mhard-float  -msoft-float
                -mhard-quad-float  -msoft-quad-float
                -mimpure-text  -mno-impure-text  -mlittle-endian
                -mstack-bias  -mno-stack-bias
                -munaligned-doubles  -mno-unaligned-doubles
                -mv8plus  -mno-v8plus  -mvis  -mno-vis
                -threads -pthreads -pthread

  System V Options

                -Qy  -Qn  -YP,paths  -Ym,dir

  TMS320C3x/C4x Options

                -mcpu=cpu  -mbig  -msmall  -mregparm  -mmemparm
                -mfast-fix  -mmpyi  -mbk  -mti  -mdp-isr-reload
                -mrpts=count  -mrptb  -mdb  -mloop-unsigned
                -mparallel-insns  -mparallel-mpy  -mpreserve-float

  V850 Options

                -mlong-calls  -mno-long-calls  -mep  -mno-ep
                -mprolog-function  -mno-prolog-function  -mspace
                -mtda=n  -msda=n  -mzda=n
                -mapp-regs  -mno-app-regs
                -mdisable-callt  -mno-disable-callt
                -mv850e1
                -mv850e
                -mv850  -mbig-switch

  VAX Options

                -mg  -mgnu  -munix

  x86-64 Options See i386 and x86-64 Options.

  Xstormy16 Options

                -msim

  Xtensa Options

                -mconst16 -mno-const16
                -mfused-madd  -mno-fused-madd
                -mtext-section-literals  -mno-text-section-literals
                -mtarget-align  -mno-target-align
                -mlongcalls  -mno-longcalls

  zSeries Options See S/390 and zSeries Options.

Code Generation Options
  See Options for Code Generation Conventions.

                -fcall-saved-reg  -fcall-used-reg
                -ffixed-reg  -fexceptions
                -fnon-call-exceptions  -funwind-tables
                -fasynchronous-unwind-tables
                -finhibit-size-directive  -finstrument-functions
                -fno-common  -fno-ident
                -fpcc-struct-return  -fpic  -fPIC -fpie -fPIE
                -fno-jump-tables
                -freg-struct-return  -fshared-data  -fshort-enums
                -fshort-double  -fshort-wchar
                -fverbose-asm  -fpack-struct[=n]  -fstack-check
                -fstack-limit-register=reg  -fstack-limit-symbol=sym
                -fargument-alias  -fargument-noalias
                -fargument-noalias-global  -fleading-underscore
                -ftls-model=model
                -ftrapv  -fwrapv  -fbounds-check
                -fvisibility