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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 Options Controlling the Kind of Output.
          -c  -S  -E  -o file  -no-canonical-prefixes  
          -pipe  -pass-exit-codes  
          -x language  -v  -###  --help[=class[,...]]  --target-help  
          --version -wrapper @file -fplugin=file -fplugin-arg-name=arg  
          -fdump-ada-spec[-slim] -fada-spec-parent=unit -fdump-go-spec=file

C Language Options
See Options Controlling C Dialect.
          -ansi  -std=standard  -fgnu89-inline 
          -aux-info filename -fallow-parameterless-variadic-functions 
          -fno-asm  -fno-builtin  -fno-builtin-function 
          -fhosted  -ffreestanding -fopenmp -fopenmp-simd -fms-extensions 
          -fplan9-extensions -trigraphs  -traditional  -traditional-cpp 
          -fallow-single-precision  -fcond-mismatch -flax-vector-conversions 
          -fsigned-bitfields  -fsigned-char 
          -funsigned-bitfields  -funsigned-char

C++ Language Options
See Options Controlling C++ Dialect.
          -fabi-version=n  -fno-access-control  -fcheck-new 
          -fconstexpr-depth=n  -ffriend-injection 
          -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  -fnothrow-opt  -fno-operator-names 
          -fno-optional-diags  -fpermissive 
          -fno-pretty-templates 
          -frepo  -fno-rtti  -fstats  -ftemplate-backtrace-limit=n 
          -ftemplate-depth=n 
          -fno-threadsafe-statics  -fuse-cxa-atexit 
          -fno-weak  -nostdinc++ 
          -fvisibility-inlines-hidden 
          -fvtable-verify=std|preinit|none 
          -fvtv-counts -fvtv-debug 
          -fvisibility-ms-compat 
          -fext-numeric-literals 
          -Wabi=n  -Wconversion-null  -Wctor-dtor-privacy 
          -Wdelete-non-virtual-dtor -Wliteral-suffix -Wnarrowing 
          -Wnoexcept -Wnon-virtual-dtor  -Wreorder 
          -Weffc++  -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-abi-version=n 
          -fobjc-call-cxx-cdtors 
          -fobjc-direct-dispatch 
          -fobjc-exceptions 
          -fobjc-gc 
          -fobjc-nilcheck 
          -fobjc-std=objc1 
          -fno-local-ivars 
          -fivar-visibility=public|protected|private|package 
          -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-color=[auto|never|always]  
          -fno-diagnostics-show-option -fno-diagnostics-show-caret

Warning Options
See Options to Request or Suppress Warnings.
          -fsyntax-only  -fmax-errors=n  -Wpedantic 
          -pedantic-errors 
          -w  -Wextra  -Wall  -Waddress  -Waggregate-return  
          -Waggressive-loop-optimizations -Warray-bounds 
          -Wbool-compare 
          -Wno-attributes -Wno-builtin-macro-redefined 
          -Wc90-c99-compat -Wc99-c11-compat 
          -Wc++-compat -Wc++11-compat -Wcast-align  -Wcast-qual  
          -Wchar-subscripts -Wclobbered  -Wcomment -Wconditionally-supported  
          -Wconversion -Wcoverage-mismatch -Wdate-time -Wdelete-incomplete -Wno-cpp  
          -Wno-deprecated -Wno-deprecated-declarations -Wno-designated-init 
          -Wdisabled-optimization -Wno-discarded-qualifiers 
          -Wno-div-by-zero -Wdouble-promotion -Wempty-body  -Wenum-compare 
          -Wno-endif-labels -Werror  -Werror=* 
          -Wfatal-errors  -Wfloat-equal  -Wformat  -Wformat=2 
          -Wno-format-contains-nul -Wno-format-extra-args -Wformat-nonliteral 
          -Wformat-security  -Wformat-signedness  -Wformat-y2k 
          -Wframe-larger-than=len -Wno-free-nonheap-object -Wjump-misses-init 
          -Wignored-qualifiers  -Wincompatible-pointer-types 
          -Wimplicit  -Wimplicit-function-declaration  -Wimplicit-int 
          -Winit-self  -Winline  -Wno-int-conversion 
          -Wno-int-to-pointer-cast -Wno-invalid-offsetof 
          -Winvalid-pch -Wlarger-than=len  -Wunsafe-loop-optimizations 
          -Wlogical-op -Wlogical-not-parentheses -Wlong-long 
          -Wmain -Wmaybe-uninitialized -Wmemset-transposed-args -Wmissing-braces 
          -Wmissing-field-initializers -Wmissing-include-dirs 
          -Wno-multichar  -Wnonnull  -Wnormalized=[none|id|nfc|nfkc] 
           -Wodr  -Wno-overflow  -Wopenmp-simd 
          -Woverlength-strings  -Wpacked  -Wpacked-bitfield-compat  -Wpadded 
          -Wparentheses  -Wpedantic-ms-format -Wno-pedantic-ms-format 
          -Wpointer-arith  -Wno-pointer-to-int-cast 
          -Wredundant-decls  -Wno-return-local-addr 
          -Wreturn-type  -Wsequence-point  -Wshadow  -Wno-shadow-ivar 
          -Wsign-compare  -Wsign-conversion -Wfloat-conversion 
          -Wsizeof-pointer-memaccess  -Wsizeof-array-argument 
          -Wstack-protector -Wstack-usage=len -Wstrict-aliasing 
          -Wstrict-aliasing=n  -Wstrict-overflow -Wstrict-overflow=n 
          -Wsuggest-attribute=[pure|const|noreturn|format] 
          -Wsuggest-final-types  -Wsuggest-final-methods 
          -Wmissing-format-attribute 
          -Wswitch  -Wswitch-default  -Wswitch-enum -Wswitch-bool -Wsync-nand 
          -Wsystem-headers  -Wtrampolines  -Wtrigraphs  -Wtype-limits  -Wundef 
          -Wuninitialized  -Wunknown-pragmas  -Wno-pragmas 
          -Wunsuffixed-float-constants  -Wunused  -Wunused-function 
          -Wunused-label  -Wunused-local-typedefs -Wunused-parameter 
          -Wno-unused-result -Wunused-value  -Wunused-variable 
          -Wunused-but-set-parameter -Wunused-but-set-variable 
          -Wuseless-cast -Wvariadic-macros -Wvector-operation-performance 
          -Wvla -Wvolatile-register-var  -Wwrite-strings -Wzero-as-null-pointer-constant

C and Objective-C-only Warning Options
          -Wbad-function-cast  -Wmissing-declarations 
          -Wmissing-parameter-type  -Wmissing-prototypes  -Wnested-externs 
          -Wold-style-declaration  -Wold-style-definition 
          -Wstrict-prototypes  -Wtraditional  -Wtraditional-conversion 
          -Wdeclaration-after-statement -Wpointer-sign

Debugging Options
See Options for Debugging Your Program or GCC.
          -dletters  -dumpspecs  -dumpmachine  -dumpversion 
          -fsanitize=style -fsanitize-recover 
          -fsanitize-undefined-trap-on-error 
          -fdbg-cnt-list -fdbg-cnt=counter-value-list 
          -fdisable-ipa-pass_name 
          -fdisable-rtl-pass_name 
          -fdisable-rtl-pass-name=range-list 
          -fdisable-tree-pass_name 
          -fdisable-tree-pass-name=range-list 
          -fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links 
          -fdump-translation-unit[-n] 
          -fdump-class-hierarchy[-n] 
          -fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline 
          -fdump-passes 
          -fdump-statistics 
          -fdump-tree-all 
          -fdump-tree-original[-n]  
          -fdump-tree-optimized[-n] 
          -fdump-tree-cfg -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-dom[-n] 
          -fdump-tree-dse[-n] 
          -fdump-tree-phiprop[-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-forwprop[-n] 
          -fdump-tree-fre[-n] 
          -fdump-tree-vtable-verify 
          -fdump-tree-vrp[-n] 
          -fdump-tree-storeccp[-n] 
          -fdump-final-insns=file 
          -fcompare-debug[=opts]  -fcompare-debug-second 
          -feliminate-dwarf2-dups -fno-eliminate-unused-debug-types 
          -feliminate-unused-debug-symbols -femit-class-debug-always 
          -fenable-kind-pass 
          -fenable-kind-pass=range-list 
          -fdebug-types-section -fmem-report-wpa 
          -fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report -fprofile-arcs 
          -fopt-info 
          -fopt-info-options[=file] 
          -frandom-seed=string -fsched-verbose=n 
          -fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose 
          -fstack-usage  -ftest-coverage  -ftime-report -fvar-tracking 
          -fvar-tracking-assignments  -fvar-tracking-assignments-toggle 
          -g  -glevel  -gtoggle  -gcoff  -gdwarf-version 
          -ggdb  -grecord-gcc-switches  -gno-record-gcc-switches 
          -gstabs  -gstabs+  -gstrict-dwarf  -gno-strict-dwarf 
          -gvms  -gxcoff  -gxcoff+ -gz[=type] 
          -fno-merge-debug-strings -fno-dwarf2-cfi-asm 
          -fdebug-prefix-map=old=new 
          -femit-struct-debug-baseonly -femit-struct-debug-reduced 
          -femit-struct-debug-detailed[=spec-list] 
          -p  -pg  -print-file-name=library  -print-libgcc-file-name 
          -print-multi-directory  -print-multi-lib  -print-multi-os-directory 
          -print-prog-name=program  -print-search-dirs  -Q 
          -print-sysroot -print-sysroot-headers-suffix 
          -save-temps -save-temps=cwd -save-temps=obj -time[=file]

Optimization Options
See Options that Control Optimization.
          -faggressive-loop-optimizations -falign-functions[=n] 
          -falign-jumps[=n] 
          -falign-labels[=n] -falign-loops[=n] 
          -fassociative-math -fauto-inc-dec -fbranch-probabilities 
          -fbranch-target-load-optimize -fbranch-target-load-optimize2 
          -fbtr-bb-exclusive -fcaller-saves 
          -fcheck-data-deps -fcombine-stack-adjustments -fconserve-stack 
          -fcompare-elim -fcprop-registers -fcrossjumping 
          -fcse-follow-jumps -fcse-skip-blocks -fcx-fortran-rules 
          -fcx-limited-range 
          -fdata-sections -fdce -fdelayed-branch 
          -fdelete-null-pointer-checks -fdevirtualize -fdevirtualize-speculatively -fdse 
          -fearly-inlining -fipa-sra -fexpensive-optimizations -ffat-lto-objects 
          -ffast-math -ffinite-math-only -ffloat-store -fexcess-precision=style 
          -fforward-propagate -ffp-contract=style -ffunction-sections 
          -fgcse -fgcse-after-reload -fgcse-las -fgcse-lm -fgraphite-identity 
          -fgcse-sm -fhoist-adjacent-loads -fif-conversion 
          -fif-conversion2 -findirect-inlining 
          -finline-functions -finline-functions-called-once -finline-limit=n 
          -finline-small-functions -fipa-cp -fipa-cp-clone 
          -fipa-pta -fipa-profile -fipa-pure-const -fipa-reference 
          -fira-algorithm=algorithm 
          -fira-region=region -fira-hoist-pressure 
          -fira-loop-pressure -fno-ira-share-save-slots 
          -fno-ira-share-spill-slots -fira-verbose=n 
          -fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute 
          -fivopts -fkeep-inline-functions -fkeep-static-consts -flive-range-shrinkage 
          -floop-block -floop-interchange -floop-strip-mine -floop-nest-optimize 
          -floop-parallelize-all -flto -flto-compression-level 
          -flto-partition=alg -flto-report -flto-report-wpa -fmerge-all-constants 
          -fmerge-constants -fmodulo-sched -fmodulo-sched-allow-regmoves 
          -fmove-loop-invariants -fno-branch-count-reg 
          -fno-defer-pop -fno-function-cse -fno-guess-branch-probability 
          -fno-inline -fno-math-errno -fno-peephole -fno-peephole2 
          -fno-sched-interblock -fno-sched-spec -fno-signed-zeros 
          -fno-toplevel-reorder -fno-trapping-math -fno-zero-initialized-in-bss 
          -fomit-frame-pointer -foptimize-sibling-calls 
          -fpartial-inlining -fpeel-loops -fpredictive-commoning 
          -fprefetch-loop-arrays -fprofile-report 
          -fprofile-correction -fprofile-dir=path -fprofile-generate 
          -fprofile-generate=path 
          -fprofile-use -fprofile-use=path -fprofile-values -fprofile-reorder-functions 
          -freciprocal-math -free -frename-registers -freorder-blocks 
          -freorder-blocks-and-partition -freorder-functions 
          -frerun-cse-after-loop -freschedule-modulo-scheduled-loops 
          -frounding-math -fsched2-use-superblocks -fsched-pressure 
          -fsched-spec-load -fsched-spec-load-dangerous 
          -fsched-stalled-insns-dep[=n] -fsched-stalled-insns[=n] 
          -fsched-group-heuristic -fsched-critical-path-heuristic 
          -fsched-spec-insn-heuristic -fsched-rank-heuristic 
          -fsched-last-insn-heuristic -fsched-dep-count-heuristic 
          -fschedule-insns -fschedule-insns2 -fsection-anchors 
          -fselective-scheduling -fselective-scheduling2 
          -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops 
          -fsemantic-interposition 
          -fshrink-wrap -fsignaling-nans -fsingle-precision-constant 
          -fsplit-ivs-in-unroller -fsplit-wide-types -fssa-phiopt -fstack-protector 
          -fstack-protector-all -fstack-protector-strong -fstrict-aliasing 
          -fstrict-overflow -fthread-jumps -ftracer -ftree-bit-ccp 
          -ftree-builtin-call-dce -ftree-ccp -ftree-ch 
          -ftree-coalesce-inline-vars -ftree-coalesce-vars -ftree-copy-prop 
          -ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse 
          -ftree-forwprop -ftree-fre -ftree-loop-if-convert 
          -ftree-loop-if-convert-stores -ftree-loop-im 
          -ftree-phiprop -ftree-loop-distribution -ftree-loop-distribute-patterns 
          -ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize 
          -ftree-loop-vectorize 
          -ftree-parallelize-loops=n -ftree-pre -ftree-partial-pre -ftree-pta 
          -ftree-reassoc -ftree-sink -ftree-slsr -ftree-sra 
          -ftree-switch-conversion -ftree-tail-merge -ftree-ter 
          -ftree-vectorize -ftree-vrp 
          -funit-at-a-time -funroll-all-loops -funroll-loops 
          -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops 
          -fuse-caller-save -fvariable-expansion-in-unroller -fvect-cost-model -fvpt 
          -fweb -fwhole-program -fwpa -fuse-ld=linker -fuse-linker-plugin 
          --param name=value
          -O  -O0  -O1  -O2  -O3  -Os -Ofast -Og

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 
          -imultilib dir -isysroot dir 
          -M  -MM  -MF  -MG  -MP  -MQ  -MT  -nostdinc  
          -P  -fdebug-cpp -ftrack-macro-expansion -fworking-directory 
          -remap -trigraphs  -undef  -Umacro  
          -Wp,option -Xpreprocessor option -no-integrated-cpp

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 -static-libstdc++ 
          -static-libasan -static-libtsan -static-liblsan -static-libubsan 
          -shared -shared-libgcc  -symbolic 
          -T script  -Wl,option  -Xlinker option 
          -u symbol -z keyword

Directory Options
See Options for Directory Search.
          -Bprefix -Idir -iplugindir=dir 
          -iquotedir -Ldir -specs=file -I- 
          --sysroot=dir --no-sysroot-suffix

Machine Dependent Options
See Hardware Models and Configurations.

AArch64 Options

          -mabi=name  -mbig-endian  -mlittle-endian 
          -mgeneral-regs-only 
          -mcmodel=tiny  -mcmodel=small  -mcmodel=large 
          -mstrict-align 
          -momit-leaf-frame-pointer  -mno-omit-leaf-frame-pointer 
          -mtls-dialect=desc  -mtls-dialect=traditional 
          -march=name  -mcpu=name  -mtune=name

Adapteva Epiphany Options

          -mhalf-reg-file -mprefer-short-insn-regs 
          -mbranch-cost=num -mcmove -mnops=num -msoft-cmpsf 
          -msplit-lohi -mpost-inc -mpost-modify -mstack-offset=num 
          -mround-nearest -mlong-calls -mshort-calls -msmall16 
          -mfp-mode=mode -mvect-double -max-vect-align=num 
          -msplit-vecmove-early -m1reg-reg

ARC Options

          -mbarrel-shifter 
          -mcpu=cpu -mA6 -mARC600 -mA7 -mARC700 
          -mdpfp -mdpfp-compact -mdpfp-fast -mno-dpfp-lrsr 
          -mea -mno-mpy -mmul32x16 -mmul64 
          -mnorm -mspfp -mspfp-compact -mspfp-fast -msimd -msoft-float -mswap 
          -mcrc -mdsp-packa -mdvbf -mlock -mmac-d16 -mmac-24 -mrtsc -mswape 
          -mtelephony -mxy -misize -mannotate-align -marclinux -marclinux_prof 
          -mepilogue-cfi -mlong-calls -mmedium-calls -msdata 
          -mucb-mcount -mvolatile-cache 
          -malign-call -mauto-modify-reg -mbbit-peephole -mno-brcc 
          -mcase-vector-pcrel -mcompact-casesi -mno-cond-exec -mearly-cbranchsi 
          -mexpand-adddi -mindexed-loads -mlra -mlra-priority-none 
          -mlra-priority-compact mlra-priority-noncompact -mno-millicode 
          -mmixed-code -mq-class -mRcq -mRcw -msize-level=level 
          -mtune=cpu -mmultcost=num -munalign-prob-threshold=probability

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 
          -mfloat-abi=name 
          -mfp16-format=name
          -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 
          -mpoke-function-name 
          -mthumb  -marm 
          -mtpcs-frame  -mtpcs-leaf-frame 
          -mcaller-super-interworking  -mcallee-super-interworking 
          -mtp=name -mtls-dialect=dialect 
          -mword-relocations 
          -mfix-cortex-m3-ldrd 
          -munaligned-access 
          -mneon-for-64bits 
          -mslow-flash-data 
          -mrestrict-it

AVR Options

          -mmcu=mcu -maccumulate-args -mbranch-cost=cost 
          -mcall-prologues -mint8 -mno-interrupts -mrelax 
          -mstrict-X -mtiny-stack -Waddr-space-convert

Blackfin Options

          -mcpu=cpu[-sirevision] 
          -msim -momit-leaf-frame-pointer  -mno-omit-leaf-frame-pointer 
          -mspecld-anomaly  -mno-specld-anomaly  -mcsync-anomaly  -mno-csync-anomaly 
          -mlow-64k -mno-low64k  -mstack-check-l1  -mid-shared-library 
          -mno-id-shared-library  -mshared-library-id=n 
          -mleaf-id-shared-library  -mno-leaf-id-shared-library 
          -msep-data  -mno-sep-data  -mlong-calls  -mno-long-calls 
          -mfast-fp -minline-plt -mmulticore  -mcorea  -mcoreb  -msdram 
          -micplb

C6X Options

          -mbig-endian  -mlittle-endian -march=cpu 
          -msim -msdata=sdata-type

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

CR16 Options

          -mmac 
          -mcr16cplus -mcr16c 
          -msim -mint32 -mbit-ops
          -mdata-model=model

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 
          -iframework 
          -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 
          -mkernel -mone-byte-bool

DEC Alpha Options

          -mno-fp-regs  -msoft-float 
          -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

FR30 Options

          -msmall-model -mno-lsim

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

GNU/Linux Options

          -mglibc -muclibc -mbionic -mandroid 
          -tno-android-cc -tno-android-ld

H8/300 Options

          -mrelax  -mh  -ms  -mn  -mexr -mno-exr  -mint32  -malign-300

HPPA Options

          -march=architecture-type 
          -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-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 
          -mtune-ctrl=feature-list -mdump-tune-features -mno-default 
          -mfpmath=unit 
          -masm=dialect  -mno-fancy-math-387 
          -mno-fp-ret-in-387  -msoft-float 
          -mno-wide-multiply  -mrtd  -malign-double 
          -mpreferred-stack-boundary=num 
          -mincoming-stack-boundary=num 
          -mcld -mcx16 -msahf -mmovbe -mcrc32 
          -mrecip -mrecip=opt 
          -mvzeroupper -mprefer-avx128 
          -mmmx  -msse  -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -mavx 
          -mavx2 -mavx512f -mavx512pf -mavx512er -mavx512cd -msha 
          -maes -mpclmul -mfsgsbase -mrdrnd -mf16c -mfma -mprefetchwt1 
          -mclflushopt -mxsavec -mxsaves 
          -msse4a -m3dnow -mpopcnt -mabm -mbmi -mtbm -mfma4 -mxop -mlzcnt 
          -mbmi2 -mfxsr -mxsave -mxsaveopt -mrtm -mlwp -mthreads 
          -mno-align-stringops  -minline-all-stringops 
          -minline-stringops-dynamically -mstringop-strategy=alg 
          -mmemcpy-strategy=strategy -mmemset-strategy=strategy
          -mpush-args  -maccumulate-outgoing-args  -m128bit-long-double 
          -m96bit-long-double -mlong-double-64 -mlong-double-80 -mlong-double-128 
          -mregparm=num  -msseregparm 
          -mveclibabi=type -mvect8-ret-in-mem 
          -mpc32 -mpc64 -mpc80 -mstackrealign 
          -momit-leaf-frame-pointer  -mno-red-zone -mno-tls-direct-seg-refs 
          -mcmodel=code-model -mabi=name -maddress-mode=mode 
          -m32 -m64 -mx32 -m16 -mlarge-data-threshold=num 
          -msse2avx -mfentry -m8bit-idiv 
          -mavx256-split-unaligned-load -mavx256-split-unaligned-store 
          -mstack-protector-guard=guard

i386 and x86-64 Windows Options

          -mconsole -mcygwin -mno-cygwin -mdll 
          -mnop-fun-dllimport -mthread 
          -municode -mwin32 -mwindows -fno-set-stack-executable

IA-64 Options

          -mbig-endian  -mlittle-endian  -mgnu-as  -mgnu-ld  -mno-pic 
          -mvolatile-asm-stop  -mregister-names  -msdata -mno-sdata 
          -mconstant-gp  -mauto-pic  -mfused-madd 
          -minline-float-divide-min-latency 
          -minline-float-divide-max-throughput 
          -mno-inline-float-divide 
          -minline-int-divide-min-latency 
          -minline-int-divide-max-throughput  
          -mno-inline-int-divide 
          -minline-sqrt-min-latency -minline-sqrt-max-throughput 
          -mno-inline-sqrt 
          -mdwarf2-asm -mearly-stop-bits 
          -mfixed-range=register-range -mtls-size=tls-size 
          -mtune=cpu-type -milp32 -mlp64 
          -msched-br-data-spec -msched-ar-data-spec -msched-control-spec 
          -msched-br-in-data-spec -msched-ar-in-data-spec -msched-in-control-spec 
          -msched-spec-ldc -msched-spec-control-ldc 
          -msched-prefer-non-data-spec-insns -msched-prefer-non-control-spec-insns 
          -msched-stop-bits-after-every-cycle -msched-count-spec-in-critical-path 
          -msel-sched-dont-check-control-spec -msched-fp-mem-deps-zero-cost 
          -msched-max-memory-insns-hard-limit -msched-max-memory-insns=max-insns

LM32 Options

          -mbarrel-shift-enabled -mdivide-enabled -mmultiply-enabled 
          -msign-extend-enabled -muser-enabled

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

          -march=arch  -mcpu=cpu  -mtune=tune
          -m68000  -m68020  -m68020-40  -m68020-60  -m68030  -m68040 
          -m68060  -mcpu32  -m5200  -m5206e  -m528x  -m5307  -m5407 
          -mcfv4e  -mbitfield  -mno-bitfield  -mc68000  -mc68020 
          -mnobitfield  -mrtd  -mno-rtd  -mdiv  -mno-div  -mshort 
          -mno-short  -mhard-float  -m68881  -msoft-float  -mpcrel 
          -malign-int  -mstrict-align  -msep-data  -mno-sep-data 
          -mshared-library-id=n  -mid-shared-library  -mno-id-shared-library 
          -mxgot -mno-xgot

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

MeP Options

          -mabsdiff -mall-opts -maverage -mbased=n -mbitops 
          -mc=n -mclip -mconfig=name -mcop -mcop32 -mcop64 -mivc2 
          -mdc -mdiv -meb -mel -mio-volatile -ml -mleadz -mm -mminmax 
          -mmult -mno-opts -mrepeat -ms -msatur -msdram -msim -msimnovec -mtf 
          -mtiny=n

MicroBlaze Options

          -msoft-float -mhard-float -msmall-divides -mcpu=cpu 
          -mmemcpy -mxl-soft-mul -mxl-soft-div -mxl-barrel-shift 
          -mxl-pattern-compare -mxl-stack-check -mxl-gp-opt -mno-clearbss 
          -mxl-multiply-high -mxl-float-convert -mxl-float-sqrt 
          -mbig-endian -mlittle-endian -mxl-reorder -mxl-mode-app-model

MIPS Options

          -EL  -EB  -march=arch  -mtune=arch 
          -mips1  -mips2  -mips3  -mips4  -mips32  -mips32r2  -mips32r3  -mips32r5 
          -mips64  -mips64r2  -mips64r3  -mips64r5 
          -mips16  -mno-mips16  -mflip-mips16 
          -minterlink-compressed -mno-interlink-compressed 
          -minterlink-mips16  -mno-interlink-mips16 
          -mabi=abi  -mabicalls  -mno-abicalls 
          -mshared  -mno-shared  -mplt  -mno-plt  -mxgot  -mno-xgot 
          -mgp32  -mgp64  -mfp32  -mfp64  -mhard-float  -msoft-float 
          -mno-float  -msingle-float  -mdouble-float 
          -mabs=mode  -mnan=encoding 
          -mdsp  -mno-dsp  -mdspr2  -mno-dspr2 
          -mmcu -mmno-mcu 
          -meva -mno-eva 
          -mvirt -mno-virt 
          -mxpa -mno-xpa 
          -mmicromips -mno-micromips 
          -mfpu=fpu-type 
          -msmartmips  -mno-smartmips 
          -mpaired-single  -mno-paired-single  -mdmx  -mno-mdmx 
          -mips3d  -mno-mips3d  -mmt  -mno-mt  -mllsc  -mno-llsc 
          -mlong64  -mlong32  -msym32  -mno-sym32 
          -Gnum  -mlocal-sdata  -mno-local-sdata 
          -mextern-sdata  -mno-extern-sdata  -mgpopt  -mno-gopt 
          -membedded-data  -mno-embedded-data 
          -muninit-const-in-rodata  -mno-uninit-const-in-rodata 
          -mcode-readable=setting 
          -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 -mimadd -mno-imadd -mfused-madd  -mno-fused-madd  -nocpp 
          -mfix-24k -mno-fix-24k 
          -mfix-r4000  -mno-fix-r4000  -mfix-r4400  -mno-fix-r4400 
          -mfix-r10000 -mno-fix-r10000  -mfix-rm7000 -mno-fix-rm7000 
          -mfix-vr4120  -mno-fix-vr4120 
          -mfix-vr4130  -mno-fix-vr4130  -mfix-sb1  -mno-fix-sb1 
          -mflush-func=func  -mno-flush-func 
          -mbranch-cost=num  -mbranch-likely  -mno-branch-likely 
          -mfp-exceptions -mno-fp-exceptions 
          -mvr4130-align -mno-vr4130-align -msynci -mno-synci 
          -mrelax-pic-calls -mno-relax-pic-calls -mmcount-ra-address

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 
          -mno-am33 -mam33 -mam33-2 -mam34 
          -mtune=cpu-type 
          -mreturn-pointer-on-d0 
          -mno-crt0  -mrelax -mliw -msetlb

Moxie Options

          -meb -mel -mno-crt0

MSP430 Options

          -msim -masm-hex -mmcu= -mcpu= -mlarge -msmall -mrelax 
          -mhwmult= -minrt

NDS32 Options

          -mbig-endian -mlittle-endian 
          -mreduced-regs -mfull-regs 
          -mcmov -mno-cmov 
          -mperf-ext -mno-perf-ext 
          -mv3push -mno-v3push 
          -m16bit -mno-16bit 
          -mgp-direct -mno-gp-direct 
          -misr-vector-size=num 
          -mcache-block-size=num 
          -march=arch 
          -mforce-fp-as-gp -mforbid-fp-as-gp 
          -mex9 -mctor-dtor -mrelax

Nios II Options

          -G num -mgpopt -mno-gpopt -mel -meb 
          -mno-bypass-cache -mbypass-cache 
          -mno-cache-volatile -mcache-volatile 
          -mno-fast-sw-div -mfast-sw-div 
          -mhw-mul -mno-hw-mul -mhw-mulx -mno-hw-mulx -mno-hw-div -mhw-div 
          -mcustom-insn=N -mno-custom-insn 
          -mcustom-fpu-cfg=name 
          -mhal -msmallc -msys-crt0=name -msys-lib=name

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 
          -munix-asm  -mdec-asm

picoChip Options

          -mae=ae_type -mvliw-lookahead=N 
          -msymbol-as-address -mno-inefficient-warnings

PowerPC Options See RS/6000 and PowerPC Options.

RL78 Options

          -msim -mmul=none -mmul=g13 -mmul=rl78 
          -m64bit-doubles -m32bit-doubles

RS/6000 and PowerPC Options

          -mcpu=cpu-type 
          -mtune=cpu-type 
          -mcmodel=code-model 
          -mpowerpc64 
          -maltivec  -mno-altivec 
          -mpowerpc-gpopt  -mno-powerpc-gpopt 
          -mpowerpc-gfxopt  -mno-powerpc-gfxopt 
          -mmfcrf  -mno-mfcrf  -mpopcntb  -mno-popcntb -mpopcntd -mno-popcntd 
          -mfprnd  -mno-fprnd 
          -mcmpb -mno-cmpb -mmfpgpr -mno-mfpgpr -mhard-dfp -mno-hard-dfp 
          -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 
          -msingle-float -mdouble-float -msimple-fpu 
          -mstring  -mno-string  -mupdate  -mno-update 
          -mavoid-indexed-addresses  -mno-avoid-indexed-addresses 
          -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  -msingle-pic-base 
          -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 
          -mblock-move-inline-limit=num 
          -misel -mno-isel 
          -misel=yes  -misel=no 
          -mspe -mno-spe 
          -mspe=yes  -mspe=no 
          -mpaired 
          -mgen-cell-microcode -mwarn-cell-microcode 
          -mvrsave -mno-vrsave 
          -mmulhw -mno-mulhw 
          -mdlmzb -mno-dlmzb 
          -mfloat-gprs=yes  -mfloat-gprs=no -mfloat-gprs=single -mfloat-gprs=double 
          -mprototype  -mno-prototype 
          -msim  -mmvme  -mads  -myellowknife  -memb  -msdata 
          -msdata=opt  -mvxworks  -G num  -pthread 
          -mrecip -mrecip=opt -mno-recip -mrecip-precision 
          -mno-recip-precision 
          -mveclibabi=type -mfriz -mno-friz 
          -mpointers-to-nested-functions -mno-pointers-to-nested-functions 
          -msave-toc-indirect -mno-save-toc-indirect 
          -mpower8-fusion -mno-mpower8-fusion -mpower8-vector -mno-power8-vector 
          -mcrypto -mno-crypto -mdirect-move -mno-direct-move 
          -mquad-memory -mno-quad-memory 
          -mquad-memory-atomic -mno-quad-memory-atomic 
          -mcompat-align-parm -mno-compat-align-parm

RX Options

          -m64bit-doubles  -m32bit-doubles  -fpu  -nofpu
          -mcpu=
          -mbig-endian-data -mlittle-endian-data 
          -msmall-data 
          -msim  -mno-sim
          -mas100-syntax -mno-as100-syntax
          -mrelax
          -mmax-constant-size=
          -mint-register=
          -mpid
          -mno-warn-multiple-fast-interrupts
          -msave-acc-in-interrupts

S/390 and zSeries Options

          -mtune=cpu-type  -march=cpu-type 
          -mhard-float  -msoft-float  -mhard-dfp -mno-hard-dfp 
          -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 
          -mhotpatch[=halfwords] -mno-hotpatch

Score Options

          -meb -mel 
          -mnhwloop 
          -muls 
          -mmac 
          -mscore5 -mscore5u -mscore7 -mscore7d

SH Options

          -m1  -m2  -m2e 
          -m2a-nofpu -m2a-single-only -m2a-single -m2a 
          -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 -mno-ieee -mbitops  -misize  -minline-ic_invalidate -mpadstruct 
          -mspace -mprefergot  -musermode -multcost=number -mdiv=strategy 
          -mdivsi3_libfunc=name -mfixed-range=register-range 
          -mindexed-addressing -mgettrcost=number -mpt-fixed 
          -maccumulate-outgoing-args -minvalid-symbols 
          -matomic-model=atomic-model 
          -mbranch-cost=num -mzdcbranch -mno-zdcbranch 
          -mfused-madd -mno-fused-madd -mfsca -mno-fsca -mfsrra -mno-fsrra 
          -mpretend-cmove -mtas

Solaris 2 Options

          -mclear-hwcap -mno-clear-hwcap -mimpure-text  -mno-impure-text 
          -pthreads -pthread

SPARC Options

          -mcpu=cpu-type 
          -mtune=cpu-type 
          -mcmodel=code-model 
          -mmemory-model=mem-model 
          -m32  -m64  -mapp-regs  -mno-app-regs 
          -mfaster-structs  -mno-faster-structs  -mflat  -mno-flat 
          -mfpu  -mno-fpu  -mhard-float  -msoft-float 
          -mhard-quad-float  -msoft-quad-float 
          -mstack-bias  -mno-stack-bias 
          -munaligned-doubles  -mno-unaligned-doubles 
          -muser-mode  -mno-user-mode 
          -mv8plus  -mno-v8plus  -mvis  -mno-vis 
          -mvis2  -mno-vis2  -mvis3  -mno-vis3 
          -mcbcond -mno-cbcond 
          -mfmaf  -mno-fmaf  -mpopc  -mno-popc 
          -mfix-at697f -mfix-ut699

SPU Options

          -mwarn-reloc -merror-reloc 
          -msafe-dma -munsafe-dma 
          -mbranch-hints 
          -msmall-mem -mlarge-mem -mstdmain 
          -mfixed-range=register-range 
          -mea32 -mea64 
          -maddress-space-conversion -mno-address-space-conversion 
          -mcache-size=cache-size 
          -matomic-updates -mno-atomic-updates

System V Options

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

TILE-Gx Options

          -mcpu=CPU -m32 -m64 -mbig-endian -mlittle-endian 
          -mcmodel=code-model

TILEPro Options

          -mcpu=cpu -m32

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 
          -mv850e2v3 -mv850e2 -mv850e1 -mv850es 
          -mv850e -mv850 -mv850e3v5 
          -mloop 
          -mrelax 
          -mlong-jumps 
          -msoft-float 
          -mhard-float 
          -mgcc-abi 
          -mrh850-abi 
          -mbig-switch

VAX Options

          -mg  -mgnu  -munix

VMS Options

          -mvms-return-codes -mdebug-main=prefix -mmalloc64 
          -mpointer-size=size

VxWorks Options

          -mrtp  -non-static  -Bstatic  -Bdynamic 
          -Xbind-lazy  -Xbind-now

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

Xstormy16 Options

          -msim

Xtensa Options

          -mconst16 -mno-const16 
          -mfused-madd  -mno-fused-madd 
          -mforce-no-pic 
          -mserialize-volatile  -mno-serialize-volatile 
          -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  -fdelete-dead-exceptions  -funwind-tables 
          -fasynchronous-unwind-tables 
          -fno-gnu-unique 
          -finhibit-size-directive  -finstrument-functions 
          -finstrument-functions-exclude-function-list=sym,sym,... 
          -finstrument-functions-exclude-file-list=file,file,... 
          -fno-common  -fno-ident 
          -fpcc-struct-return  -fpic  -fPIC -fpie -fPIE 
          -fno-jump-tables 
          -frecord-gcc-switches 
          -freg-struct-return  -fshort-enums 
          -fshort-double  -fshort-wchar 
          -fverbose-asm  -fpack-struct[=n]  -fstack-check 
          -fstack-limit-register=reg  -fstack-limit-symbol=sym 
          -fno-stack-limit -fsplit-stack 
          -fleading-underscore  -ftls-model=model 
          -fstack-reuse=reuse_level 
          -ftrapv  -fwrapv  -fbounds-check 
          -fvisibility -fstrict-volatile-bitfields -fsync-libcalls