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3.1 Option Summary

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

Overall Options
See section Options Controlling the Kind of Output.
 
{
-c -S -E -o file -pipe -pass-exit-codes -x language -v --target-help --help}

C Language Options
See section Options Controlling C Dialect.
 
{
-ansi -std=standard -aux-info filename -fno-asm -fno-builtin -fhosted -ffreestanding -trigraphs -traditional -traditional-cpp -fallow-single-precision -fcond-mismatch -fsigned-bitfields -fsigned-char -funsigned-bitfields -funsigned-char -fwritable-strings -fshort-wchar}

C++ Language Options
See section Options Controlling C++ Dialect.
 
{
-fno-access-control -fcheck-new -fconserve-space -fno-const-strings -fdollars-in-identifiers -fno-elide-constructors -fno-enforce-eh-specs -fexternal-templates -falt-external-templates -ffor-scope -fno-for-scope -fno-gnu-keywords -fno-honor-std -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 -fuse-cxa-atexit -fvtable-gc -fno-weak -nostdinc++ -fno-default-inline -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Weffc++ -Wno-deprecated -Wno-non-template-friend -Wold-style-cast -Woverloaded-virtual -Wno-pmf-conversions -Wsign-promo -Wsynth}

Objective-C Language Options
See section Options Controlling Objective-C Dialect.
 
{
-fconstant-string-class=class-name -fgnu-runtime -fnext-runtime -gen-decls -Wno-protocol -Wselector}

Language Independent Options
See section Options to Control Diagnostic Messages Formatting.
 
{
-fmessage-length=n -fdiagnostics-show-location=[once|every-line]}

Warning Options
See section Options to Request or Suppress Warnings.
 
{
-fsyntax-only -pedantic -pedantic-errors -w -W -Wall -Waggregate-return -Wcast-align -Wcast-qual -Wchar-subscripts -Wcomment -Wconversion -Wdisabled-optimization -Werror -Wfloat-equal -Wformat -Wformat=2 -Wformat-nonliteral -Wformat-security -Wimplicit -Wimplicit-int -Wimplicit-function-declaration -Werror-implicit-function-declaration -Wimport -Winline -Wlarger-than-len -Wlong-long -Wmain -Wmissing-braces -Wmissing-declarations -Wmissing-format-attribute -Wmissing-noreturn -Wmultichar -Wno-format-extra-args -Wno-format-y2k -Wno-import -Wpacked -Wpadded -Wparentheses -Wpointer-arith -Wredundant-decls -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wsystem-headers -Wtrigraphs -Wundef -Wuninitialized -Wunknown-pragmas -Wunreachable-code -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value -Wunused-variable -Wwrite-strings}

C-only Warning Options
 
{
-Wbad-function-cast -Wmissing-prototypes -Wnested-externs -Wstrict-prototypes -Wtraditional}

Debugging Options
See section Options for Debugging Your Program or GCC.
 
{
-a -ax -dletters -dumpspecs -dumpmachine -dumpversion -fdump-unnumbered -fdump-translation-unit[-n] -fdump-class-hierarchy[-n] -fdump-ast-original[-n] -fdump-ast-optimized[-n] -fmem-report -fpretend-float -fprofile-arcs -ftest-coverage -ftime-report -g -glevel -gcoff -gdwarf -gdwarf-1 -gdwarf-1+ -gdwarf-2 -ggdb -gstabs -gstabs+ -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 section Options that Control Optimization.
 
{
-falign-functions=n -falign-jumps=n -falign-labels=n -falign-loops=n -fbranch-probabilities -fcaller-saves -fcse-follow-jumps -fcse-skip-blocks -fdata-sections -fdce -fdelayed-branch -fdelete-null-pointer-checks -fexpensive-optimizations -ffast-math -ffloat-store -fforce-addr -fforce-mem -ffunction-sections -fgcse -fgcse-lm -fgcse-sm -finline-functions -finline-limit=n -fkeep-inline-functions -fkeep-static-consts -fmove-all-movables -fno-default-inline -fno-defer-pop -fno-function-cse -fno-guess-branch-probability -fno-inline -fno-math-errno -fno-peephole -fno-peephole2 -funsafe-math-optimizations -fno-trapping-math -fomit-frame-pointer -foptimize-register-move -foptimize-sibling-calls -freduce-all-givs -fregmove -frename-registers -frerun-cse-after-loop -frerun-loop-opt -fschedule-insns -fschedule-insns2 -fsingle-precision-constant -fssa -fstrength-reduce -fstrict-aliasing -fthread-jumps -ftrapv -funroll-all-loops -funroll-loops --param name=value -O -O0 -O1 -O2 -O3 -Os}

Preprocessor Options
See section 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 -M -MM -MF -MG -MP -MQ -MT -nostdinc -P -remap -trigraphs -undef -Umacro -Wp\,option}

Assembler Option
See section Passing Options to the Assembler.
 
{
-Wa\,option}

Linker Options
See section Options for Linking.
 
{
object-file-name -llibrary -nostartfiles -nodefaultlibs -nostdlib -s -static -static-libgcc -shared -shared-libgcc -symbolic -Wl\,option -Xlinker option -u symbol}

Directory Options
See section Options for Directory Search.
 
{
-Bprefix -Idir -I- -Ldir -specs=file}

Target Options
See section 3.16 Specifying Target Machine and Compiler Version.
 
{
-b machine -V version}

Machine Dependent Options
See section Hardware Models and Configurations. M680x0 Options
 
{
-m68000 -m68020 -m68020-40 -m68020-60 -m68030 -m68040 -m68060 -mcpu32 -m5200 -m68881 -mbitfield -mc68000 -mc68020 -mfpa -mnobitfield -mrtd -mshort -msoft-float -mpcrel -malign-int -mstrict-align}

M68hc1x Options
 
{
-m6811 -m6812 -m68hc11 -m68hc12 -mauto-incdec -mshort -msoft-reg-count=count}

VAX Options
 
{
-mg -mgnu -munix}

SPARC Options
 
{
-mcpu=cpu-type -mtune=cpu-type -mcmodel=code-model -m32 -m64 -mapp-regs -mbroken-saverestore -mcypress -mepilogue -mfaster-structs -mflat -mfpu -mhard-float -mhard-quad-float -mimpure-text -mlive-g0 -mno-app-regs -mno-epilogue -mno-faster-structs -mno-flat -mno-fpu -mno-impure-text -mno-stack-bias -mno-unaligned-doubles -msoft-float -msoft-quad-float -msparclite -mstack-bias -msupersparc -munaligned-doubles -mv8}

Convex Options
 
{
-mc1 -mc2 -mc32 -mc34 -mc38 -margcount -mnoargcount -mlong32 -mlong64 -mvolatile-cache -mvolatile-nocache}

AMD29K Options
 
{
-m29000 -m29050 -mbw -mnbw -mdw -mndw -mlarge -mnormal -msmall -mkernel-registers -mno-reuse-arg-regs -mno-stack-check -mno-storem-bug -mreuse-arg-regs -msoft-float -mstack-check -mstorem-bug -muser-registers}

ARM Options
 
{
-mapcs-frame -mno-apcs-frame -mapcs-26 -mapcs-32 -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 -malignment-traps -mno-alignment-traps -msoft-float -mhard-float -mfpe -mthumb-interwork -mno-thumb-interwork -mcpu=name -march=name -mfpe=name -mstructure-size-boundary=n -mbsd -mxopen -mno-symrename -mabort-on-noreturn -mlong-calls -mno-long-calls -msingle-pic-base -mno-single-pic-base -mpic-register=reg -mnop-fun-dllimport -mpoke-function-name -mthumb -marm -mtpcs-frame -mtpcs-leaf-frame -mcaller-super-interworking -mcallee-super-interworking }

MN10200 Options
 
{
-mrelax}

MN10300 Options
 
{
-mmult-bug -mno-mult-bug -mam33 -mno-am33 -mno-crt0 -mrelax}

M32R/D Options
 
{
-mcode-model=model-type -msdata=sdata-type -G num}

M88K Options
 
{
-m88000 -m88100 -m88110 -mbig-pic -mcheck-zero-division -mhandle-large-shift -midentify-revision -mno-check-zero-division -mno-ocs-debug-info -mno-ocs-frame-position -mno-optimize-arg-area -mno-serialize-volatile -mno-underscores -mocs-debug-info -mocs-frame-position -moptimize-arg-area -mserialize-volatile -mshort-data-num -msvr3 -msvr4 -mtrap-large-shift -muse-div-instruction -mversion-03.00 -mwarn-passed-structs}

RS/6000 and PowerPC Options
 
{
-mcpu=cpu-type -mtune=cpu-type -mpower -mno-power -mpower2 -mno-power2 -mpowerpc -mpowerpc64 -mno-powerpc -mpowerpc-gpopt -mno-powerpc-gpopt -mpowerpc-gfxopt -mno-powerpc-gfxopt -mnew-mnemonics -mold-mnemonics -mfull-toc -mminimal-toc -mno-fop-in-toc -mno-sum-in-toc -m64 -m32 -mxl-call -mno-xl-call -mthreads -mpe -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 -mcall-aix -mcall-sysv -mprototype -mno-prototype -msim -mmvme -mads -myellowknife -memb -msdata -msdata=opt -mvxworks -G num}

RT Options
 
{
-mcall-lib-mul -mfp-arg-in-fpregs -mfp-arg-in-gregs -mfull-fp-blocks -mhc-struct-return -min-line-mul -mminimum-fp-blocks -mnohc-struct-return}

MIPS Options
 
{
-mabicalls -mcpu=cpu-type -membedded-data -muninit-const-in-rodata -membedded-pic -mfp32 -mfp64 -mgas -mgp32 -mgp64 -mgpopt -mhalf-pic -mhard-float -mint64 -mips1 -mips2 -mips3 -mips4 -mlong64 -mlong32 -mlong-calls -mmemcpy -mmips-as -mmips-tfile -mno-abicalls -mno-embedded-data -mno-uninit-const-in-rodata -mno-embedded-pic -mno-gpopt -mno-long-calls -mno-memcpy -mno-mips-tfile -mno-rnames -mno-stats -mrnames -msoft-float -m4650 -msingle-float -mmad -mstats -EL -EB -G num -nocpp -mabi=32 -mabi=n32 -mabi=64 -mabi=eabi -mfix7000 -mno-crt0}

i386 Options
 
{
-mcpu=cpu-type -march=cpu-type -mintel-syntax -mieee-fp -mno-fancy-math-387 -mno-fp-ret-in-387 -msoft-float -msvr3-shlib -mno-wide-multiply -mrtd -malign-double -mpreferred-stack-boundary=num -mthreads -mno-align-stringops -minline-all-stringops -mpush-args -maccumulate-outgoing-args -m128bit-long-double -m96bit-long-double -mregparm=num -momit-leaf-frame-pointer}

HPPA Options
 
{
-march=architecture-type -mbig-switch -mdisable-fpregs -mdisable-indexing -mfast-indirect-calls -mgas -mjump-in-delay -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}

Intel 960 Options
 
{
-mcpu-type -masm-compat -mclean-linkage -mcode-align -mcomplex-addr -mleaf-procedures -mic-compat -mic2.0-compat -mic3.0-compat -mintel-asm -mno-clean-linkage -mno-code-align -mno-complex-addr -mno-leaf-procedures -mno-old-align -mno-strict-align -mno-tail-call -mnumerics -mold-align -msoft-float -mstrict-align -mtail-call}

DEC Alpha Options
 
{
-mfp-regs -mno-fp-regs -mno-soft-float -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 -mbwx -mno-bwx -mcix -mno-cix -mmax -mno-max -mmemory-latency=time}

Clipper Options
 
{
-mc300 -mc400}

H8/300 Options
 
{
-mrelax -mh -ms -mint32 -malign-300}

SH Options
 
{
-m1 -m2 -m3 -m3e -m4-nofpu -m4-single-only -m4-single -m4 -mb -ml -mdalign -mrelax -mbigtable -mfmovd -mhitachi -mnomacsave -mieee -misize -mpadstruct -mspace -mprefergot -musermode}

System V Options
 
{
-Qy -Qn -YP\,paths -Ym\,dir}

ARC Options
 
{
-EB -EL -mmangle-cpu -mcpu=cpu -mtext=text-section -mdata=data-section -mrodata=readonly-data-section}

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 -mv850 -mbig-switch}

NS32K Options
 
{
-m32032 -m32332 -m32532 -m32081 -m32381 -mmult-add -mnomult-add -msoft-float -mrtd -mnortd -mregparam -mnoregparam -msb -mnosb -mbitfield -mnobitfield -mhimem -mnohimem}

AVR Options
 
{
-mmcu=mcu -msize -minit-stack=n -mno-interrupts -mcall-prologues -mno-tablejump -mtiny-stack}

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}

IA-64 Options
 
{
-mbig-endian -mlittle-endian -mgnu-as -mgnu-ld -mno-pic -mvolatile-asm-stop -mb-step -mregister-names -mno-sdata -mconstant-gp -mauto-pic -minline-divide-min-latency -minline-divide-max-throughput -mno-dwarf2-asm -mfixed-range=register-range}

Code Generation Options
See section Options for Code Generation Conventions.
 
{
-fcall-saved-reg -fcall-used-reg -ffixed-reg -fexceptions -fnon-call-exceptions -funwind-tables -finhibit-size-directive -finstrument-functions -fcheck-memory-usage -fprefix-function-name -fno-common -fno-ident -fno-gnu-linker -fpcc-struct-return -fpic -fPIC -freg-struct-return -fshared-data -fshort-enums -fshort-double -fvolatile -fvolatile-global -fvolatile-static -fverbose-asm -fpack-struct -fstack-check -fstack-limit-register=reg -fstack-limit-symbol=sym -fargument-alias -fargument-noalias -fargument-noalias-global -fleading-underscore}

3.2 Options Controlling the Kind of Output  Controlling the kind of output: an executable, object files, assembler files, or preprocessed source.
3.4 Options Controlling C Dialect  Controlling the variant of C language compiled.
3.5 Options Controlling C++ Dialect  Variations on C++.
3.6 Options Controlling Objective-C Dialect  Variations on Objective-C.
3.7 Options to Control Diagnostic Messages Formatting  Controlling how diagnostics should be formatted.
3.8 Options to Request or Suppress Warnings  How picky should the compiler be?
3.9 Options for Debugging Your Program or GCC  Symbol tables, measurements, and debugging dumps.
3.10 Options That Control Optimization  How much optimization?
3.11 Options Controlling the Preprocessor  Controlling header files and macro definitions. Also, getting dependency information for Make.
3.12 Passing Options to the Assembler  Passing options to the assembler.
3.13 Options for Linking  Specifying libraries and so on.
3.14 Options for Directory Search  Where to find header files and libraries. Where to find the compiler executable files.
3.15 Specifying subprocesses and the switches to pass to them  How to pass switches to sub-processes.
3.16 Specifying Target Machine and Compiler Version  Running a cross-compiler, or an old version of GCC.

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