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　　GCC
　　Section: GNU Tools (1)
　　Updated: 1998/08/29
　　Index Return to Main Contents
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　　NAME
　　gcc, g++ - GNU project C and C++ Compiler (egcs-1.1.2)
　　SYNOPSIS
　　gcc [ option filename ]...
　　g++ [ option filename ]...
　　WARNING
　　The information in this man page is an extract from the full documentation of the GNU C compiler, and is limited to the meaning of the options.
　　This man page is not kept up to date except when volunteers want to maintain it. If you find a discrepancy between the man page and the software, please check the Info file, which is the authoritative documentation.
　　
　　If we find that the things in this man page that are out of date cause significant confusion or complaints, we will stop distributing the man page. The alternative, updating the man page when we update the Info file, is impossible because the rest of the work of maintaining GNU CC leaves us no time for that. The GNU project regards man pages as obsolete and should not let them take time away from other things.
　　
　　For complete and current documentation, refer to the Info file `gcc' or the manual Using and Porting GNU CC (for version 2.0). Both are made from the Texinfo source file gcc.texinfo.
　　
　　DESCRIPTION
　　The C and C++ compilers are integrated. Both process input files through one or more of four stages: preprocessing, compilation, assembly, and linking. Source filename suffixes identify the source language, but which name you use for the compiler governs default assumptions:
　　gcc
　　assumes preprocessed (.i) files are C and assumes C style linking.
　　g++
　　assumes preprocessed (.i) files are C++ and assumes C++ style linking.
　　Suffixes of source file names indicate the language and kind of processing to be done:
　　
　　
　　
　　.c C source; preprocess, compile, assemble
　　.C C++ source; preprocess, compile, assemble
　　.cc C++ source; preprocess, compile, assemble
　　.cxx C++ source; preprocess, compile, assemble
　　.m Objective-C source; preprocess, compile, assemble
　　.i preprocessed C; compile, assemble
　　.ii preprocessed C++; compile, assemble
　　.s Assembler source; assemble
　　.S Assembler source; preprocess, assemble
　　.h Preprocessor file; not usually named on command line
　　
　　
　　
　　Files with other suffixes are passed to the linker. Common cases include:
　　
　　.o Object file
　　.a Archive file
　　
　　
　　Linking is always the last stage unless you use one of the -c, -S, or -E options to avoid it (or unless compilation errors stop the whole process). For the link stage, all .o files corresponding to source files, -l libraries, unrecognized filenames (including named .o object files and .a archives) are passed to the linker in command-line order.
　　
　　
　　OPTIONS
　　Options must be separate: `-dr' is quite different from `-d -r '.
　　Most `-f' and `-W' options have two contrary forms: -fname and -fno-name (or -Wname and -Wno-name). Only the non-default forms are shown here.
　　
　　Here is a summary of all the options, grouped by type. EXPlanations are in the following sections.
　　
　　Overall Options
　　
　　-c -S -E -o file -pipe -v -x language
　　Language Options
　　-ansi -fall-virtual -fcond-mismatch -fdollars-in-identifiers -fenum-int-equiv -fexternal-templates -fno-asm -fno-builtin -fhosted -fno-hosted -ffreestanding -fno-freestanding -fno-strict-prototype -fsigned-bitfields -fsigned-char -fthis-is-variable -funsigned-bitfields -funsigned-char -fwritable-strings -traditional -traditional-cpp -trigraphs
　　Warning Options
　　-fsyntax-only -pedantic -pedantic-errors -w -W -Wall -Waggregate-return -Wcast-align -Wcast-qual -Wchar-subscript -Wcomment -Wconversion -Wenum-clash -Werror -Wformat -Wid-clash-len -Wimplicit -Wimplicit-int -Wimplicit-function-declaration -Winline -Wlong-long -Wmain -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Wno-import -Wparentheses -Wpointer-arith -Wredundant-decls -Wreturn-type -Wshadow -Wstrict-prototypes -Wswitch -Wtemplate-debugging -Wtraditional -Wtrigraphs -Wuninitialized -Wunused -Wwrite-strings
　　Debugging Options
　　-a -dletters -fpretend-float -g -glevel -gcoff -gxcoff -gxcoff+ -gdwarf -gdwarf+ -gstabs -gstabs+ -ggdb -p -pg -save-temps -print-file-name=library -print-libgcc-file-name -print-prog-name=program
　　Optimization Options
　　-fcaller-saves -fcse-follow-jumps -fcse-skip-blocks -fdelayed-branch -felide-constrUCtors -fexpensive-optimizations -ffast-math -ffloat-store -fforce-addr -fforce-mem -finline-functions -fkeep-inline-functions -fmemoize-lookups -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 -O2 -O3
　　Preprocessor Options
　　-Aassertion -C -dD -dM -dN -Dmacro[=defn] -E -H -idirafter dir -include file -imacros file -iprefix file -iwithprefix dir -M -MD -MM -MMD -nostdinc -P -Umacro -undef
　　Assembler Option
　　-Wa,option
　　Linker Options
　　-llibrary -nostartfiles -nostdlib -static -shared -symbolic -Xlinker option -Wl,option -u symbol
　　Directory Options
　　-Bprefix -Idir -I- -Ldir
　　Target Options
　　-b machine -V version
　　Configuration Dependent Options
　　M680x0 Options
　　
　　 -m68000 -m68020 -m68020-40 -m68030 -m68040 -m68881 -mbitfield -mc68000 -mc68020 -mfpa -mnobitfield -mrtd -mshort -msoft-float
　　VAX Options
　　-mg -mgnu -munix
　　
　　SPARC Options
　　-mepilogue -mfpu -mhard-float -mno-fpu -mno-epilogue -msoft-float -msparclite -mv8 -msupersparc -mcypress
　　
　　Convex Options
　　-margcount -mc1 -mc2 -mnoargcount
　　
　　AMD29K Options
　　-m29000 -m29050 -mbw -mdw -mkernel-registers -mlarge -mnbw -mnodw -msmall -mstack-check -muser-registers
　　
　　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
　　
　　RS6000 Options
　　-mfp-in-toc -mno-fop-in-toc
　　
　　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
　　-mcpu=cpu type -mips2 -mips3 -mint64 -mlong64 -mlonglong128 -mmips-as -mgas -mrnames -mno-rnames -mgpopt -mno-gpopt -mstats -mno-stats -mmemcpy -mno-memcpy -mno-mips-tfile -mmips-tfile -msoft-float -mhard-float -mabicalls -mno-abicalls -mhalf-pic -mno-half-pic -G num -nocpp
　　
　　i386 Options
　　-m486 -mno-486 -msoft-float -mno-fp-ret-in-387
　　
　　HPPA Options
　　-mpa-risc-1-0 -mpa-risc-1-1 -mkernel -mshared-libs -mno-shared-libs -mlong-calls -mdisable-fpregs -mdisable-indexing -mtrailing-colon
　　
　　i960 Options
　　-mcpu-type -mnumerics -msoft-float -mleaf-procedures -mno-leaf-procedures -mtail-call -mno-tail-call -mcomplex-addr -mno-complex-addr -mcode-align -mno-code-align -mic-compat -mic2.0-compat -mic3.0-compat -masm-compat -mintel-asm -mstrict-align -mno-strict-align -mold-align -mno-old-align
　　
　　DEC