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  -v  -x language

C Language Options

See section Options Controlling C Dialect.

-ansi  -fallow-single-precision  -fcond-mismatch  -fno-asm
-fno-builtin  -ffreestanding  -fhosted  -fsigned-bitfields  -fsigned-char
-funsigned-bitfields  -funsigned-char  -fwritable-strings
-traditional  -traditional-cpp  -trigraphs

C++ Language Options

See section Options Controlling C++ Dialect.

-fall-virtual  -fdollars-in-identifiers  -felide-constructors
-fenum-int-equiv  -fexternal-templates  -ffor-scope  -fno-for-scope
-fhandle-signatures  -fmemoize-lookups  -fname-mangling-version-n
-fno-default-inline  -fno-gnu-keywords -fnonnull-objects -fguiding-decls
-foperator-names  -fstrict-prototype  -fthis-is-variable
-ftemplate-depth-n  -nostdinc++  -traditional  +en

Warning Options

See section Options to Request or Suppress Warnings.

-fsyntax-only  -pedantic  -pedantic-errors
-w  -W  -Wall  -Waggregate-return  -Wbad-function-cast
-Wcast-align  -Wcast-qual  -Wchar-subscript  -Wcomment
-Wconversion  -Werror  -Wformat
-Wid-clash-len  -Wimplicit -Wimplicit-int 
-Wimplicit-function-declarations -Wimport  -Winline
-Wlarger-than-len  -Wmain  -Wmissing-declarations
-Wmissing-prototypes  -Wnested-externs
-Wno-import  -Wold-style-cast  -Woverloaded-virtual  -Wparentheses
-Wpointer-arith  -Wredundant-decls  -Wreorder  -Wreturn-type  -Wshadow
-Wsign-compare  -Wstrict-prototypes  -Wswitch  -Wsynth
-Wtemplate-debugging  -Wtraditional  -Wtrigraphs
-Wundef  -Wuninitialized  -Wunused  -Wwrite-strings

Debugging Options

See section Options for Debugging Your Program or GNU CC.

-a  -ax  -dletters  -fpretend-float
-fprofile-arcs  -ftest-coverage
-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-prog-name=program  -print-search-dirs  -save-temps

Optimization Options

See section Options That Control Optimization.

-fbranch-probabilities
-fcaller-saves  -fcse-follow-jumps  -fcse-skip-blocks
-fdelayed-branch   -fexpensive-optimizations
-ffast-math  -ffloat-store  -fforce-addr  -fforce-mem
-ffunction-sections  -finline-functions
-fkeep-inline-functions  -fno-default-inline
-fno-defer-pop  -fno-function-cse
-fno-inline  -fno-peephole  -fomit-frame-pointer
-frerun-cse-after-loop  -fschedule-insns
-fschedule-insns2  -fstrength-reduce  -fthread-jumps
-funroll-all-loops  -funroll-loops
-O  -O0  -O1  -O2  -O3

Preprocessor Options

See section Options Controlling the Preprocessor.

-Aquestion(answer)  -C  -dD  -dM  -dN
-Dmacro[=defn]  -E  -H
-idirafter dir
-include file  -imacros file
-iprefix file  -iwithprefix dir
-iwithprefixbefore dir  -isystem dir
-M  -MD  -MM  -MMD  -MG  -nostdinc  -P  -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  -shared  -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 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  -m5200  -m68881  -mbitfield  -mc68000  -mc68020  -mfpa
-mnobitfield  -mrtd  -mshort  -msoft-float  -malign-int

VAX Options
-mg  -mgnu  -munix

SPARC Options
-mcpu=cpu type
-mtune=cpu type
-mcmodel=code model
-malign-jumps=num  -malign-loops=num
-malign-functions=num
-m32  -m64
-mapp-regs  -mbroken-saverestore  -mcypress  -mepilogue
-mflat  -mfpu  -mhard-float  -mhard-quad-float
-mimpure-text  -mlive-g0  -mno-app-regs  -mno-epilogue
-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  -mapcs-26  -mapcs-32
-mlittle-endian  -mbig-endian  -mwords-little-endian
-mshort-load-bytes  -mno-short-load-bytes
-msoft-float  -mhard-float
-mbsd  -mxopen  -mno-symrename

MN10300 Options
-mmult-bug
-mno-mult-bug

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  -mno-powerpc
-mpowerpc-gpopt  -mno-powerpc-gpopt
-mpowerpc-gfxopt  -mno-powerpc-gfxopt
-mnew-mnemonics  -mno-new-mnemonics
-mfull-toc   -mminimal-toc  -mno-fop-in-toc  -mno-sum-in-toc
-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  -mtraceback  -mno-traceback
-mlittle  -mlittle-endian  -mbig  -mbig-endian
-mcall-aix  -mcall-sysv  -mprototype  -mno-prototype
-msim  -mmvme  -mads  -myellowknife  -memb
-msdata  -msdata=opt  -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
-membedded-pic  -mfp32  -mfp64  -mgas  -mgp32  -mgp64
-mgpopt  -mhalf-pic  -mhard-float  -mint64  -mips1
-mips2  -mips3  -mlong64  -mlong-calls  -mmemcpy
-mmips-as  -mmips-tfile  -mno-abicalls
-mno-embedded-data  -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

i386 Options
-mcpu=cpu type
-march=cpu type
-mieee-fp  -mno-fancy-math-387
-mno-fp-ret-in-387  -msoft-float  -msvr3-shlib
-mno-wide-multiply  -mrtd  -malign-double
-mreg-alloc=list  -mregparm=num
-malign-jumps=num  -malign-loops=num
-malign-functions=num

HPPA Options
-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  -mno-space-regs
-msoft-float
-mpa-risc-1-0  -mpa-risc-1-1  -mportable-runtime
-mschedule=list  -mspace  -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

Clipper Options
-mc300  -mc400

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

SH Options
-m1  -m2  -m3  -m3e  -mb  -ml  -mrelax

System V Options
-Qy  -Qn  -YP,paths  -Ym,dir

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

Code Generation Options

See section Options for Code Generation Conventions.

-fcall-saved-reg  -fcall-used-reg
-ffixed-reg  -finhibit-size-directive
-fcheck-memory-usage  -fprefix-function-name
-fno-common  -fno-ident  -fno-gnu-linker
-fpcc-struct-return  -freg-struct-return
-fshared-data  -fpic  -fPIC  -fexceptions
-fshort-enums  -fshort-double  -fvolatile  -fvolatile-global
-fverbose-asm  -fpack-struct  -fstack-check  +e0  +e1

• Overall Options: Controlling the kind of output: an executable, object files, assembler files, or preprocessed source.
• C Dialect Options: Controlling the variant of C language compiled.
• C++ Dialect Options: Variations on C++.
• Warning Options: How picky should the compiler be?
• Debugging Options: Symbol tables, measurements, and debugging dumps.
• Optimize Options: How much optimization?
• Preprocessor Options: Controlling header files and macro definitions. Also, getting dependency information for Make.
• Assembler Options: Passing options to the assembler.
• Link Options: Specifying libraries and so on.
• Directory Options: Where to find header files and libraries. Where to find the compiler executable files.
• Target Options: Running a cross-compiler, or an old version of GNU CC.

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