使用语法：gcc [ option | filename ]... g++ [ option | filename ]... 其中 option 为 gcc 使用时的选项(后面会再详述)， 而 filename 为欲以 gcc 处理的文件 说明：这 C 与 C++ 的 compiler 已将产生新程序的相关程序整合起来。产 生一个新的程序需要经过四个阶段：预处理、编译、汇编、连结，而这两 个编译器都能将输入的文件做不同阶段的处理。虽然原始程序的扩展名可 用来分辨编写原始程序码所用的语言，但不同的compiler，其预设的处理 程序却各不相同： gcc 预设经由预处理过(扩展名为.i)的文件为 C 语言，并於程式 连结阶段以 C 的连结方式处理。 g++ 预设经由预处理过(扩展名为.i)的文件为 C++ 语言，并於程 序连结阶段以 C++ 的连结方式处理。 原始程序码的扩展名指出所用编写程序所用的语言，以及相对应的处 理方法： .c C 原始程序 ； 预处理、编译、汇编 .C C++ 原始程序 ； 预处理、编译、汇编 .cc C++ 原始程序 ； 预处理、编译、汇编 .cxx C++ 原始程序 ； 预处理、编译、汇编 .m Objective-C 原始程序 ； 预处理、编译、汇编 .i 已经过预处理之 C 原始程序 ； 编译、汇编 .ii 已经过预处理之 C++ 原始程序 ； 编译、汇编 .s 组合语言原始程序 ； 汇编 .S 组合语言原始程序 ； 预处理、汇编 .h 预处理文件(标头文件) ； (不常出现在指令行) 其他扩展名的文件是由连结程序来处理，通常有： .o Object file .a Archive file 除非编译过程出现错误，否则 "连结" 一定是产生一个新程序的最 後阶段。然而你也可以以 -c、-s 或 -E 等选项，将整个过程自四 个阶段中的其中一个停止。在连结阶段，所有与原始码相对应的 .o 文件、程序库、和其他无法自文件名辨明属性的文件(包括不以 .o 为扩展名的 object file 以及扩展名为 .a 的 archive file)都会 交由连结程序来处理(在指令行将那些文件当作连结程序的参数传给 连结程序)。 选项： 不同的选项必须分开来下：例如 `-dr' 这个选项就与 `-d -r' 大 不相同。 绝大部份的 `-f' 及 `-W' 选项都有正反两种形式：-fname 及 -fno-name (或 -Wname 及 -Wno-name)。以下只列出非预设的那个 形式。 以下是所有选项的摘要。以形式来分类。选项的意义将另辟小节说 明。 一般性(概略、常用的)选项 -c -S -E -o file -pipe -v -x language 程序语言选项 -ansi -fall-virtual -fcond-mismatch -fdollars-in-identifiers -fenum-int-equiv -fexternal-templates -fno-asm -fno-builtin -fno-strict-prototype -fsigned-bitfields -fsigned-char -fthis-is-variable -funsigned-bitfields -funsigned-char -fwritable-strings -traditional -traditional-cpp -trigraphs 编译时的警告选项 -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 -Winline -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 除错选项 -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 最佳化选项 -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 预处理选项 -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 汇编程序选项 -Wa,option 连结程序选项 -llibrary -nostartfiles -nostdlib -static -shared -symbolic -Xlinker option -Wl,option -u symbol </P><P> 目录选项 -Bprefix -Idir -I- -Ldir Target Options -b machine -V version 与机器(平台)相关的选项 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 Alpha Options -mfp-regs -mno-fp-regs -mno-soft-float -msoft-float System V Options -G -Qy -Qn -YP,paths -Ym,dir Code Generation Options -fcall-saved-reg -fcall-used-reg -ffixed-reg -finhibit-size-directive -fnonnull-objects -fno-common -fno-ident -fno-gnu-linker -fpcc-struct-return -fpic -fPIC -freg-struct-returno -fshared-data -fshort-enums -fshort-double -fvolatile -fvolatile-global -fverbose-asm PRAGMAS Two `#pragma' directives are supported for GNU C++, to permit using the same header file for two purposes: as a definition of interfaces to a given object class, and as the full definition of the contents of that object class. #pragma interface (C++ only.) Use this directive in header files that define object classes, to save space in most of the object files that use those classes. Nor- mally, local copies of certain information (backup copies of inline member functions, debugging infor- mation, and the internal tables that implement vir- tual functions) must be kept in each object file that includes class definitions. You can use this pragma to avoid such duplication. When a header file containing `#pragma interface' is included in a compilation, this auxiliary information will not be generated (unless the main input source file it- self uses `#pragma implementation'). Instead, the object files will contain references to be resolved at link time. #pragma implementation #pragma implementation "objects.h" (C++ only.) Use this pragma in a main input file, when you want full output from included header files to be generated (and made globally visible). The included header file, in turn, should use `#pragma interface'. Backup copies of inline mem- ber functions, debugging information, and the in- ternal tables used to implement virtual functions are all generated in implementation files. If you use `#pragma implementation' with no argu- ment, it applies to an include file with the same basename as your source file; for example, in `allclass.cc', `#pragma implementation' by itself is equivalent to `#pragma implementation "allclass.h"'. Use the string argument if you want a single implementation file to include code from multiple header files. There is no way to split up the contents of a sin- gle header file into multiple implementation files. 文件说明 file.c C source file file.h C header (preprocessor) file file.i 经预处理过的 C source file file.C C++ source file file.cc C++ source file file.cxx C++ source file file.m Objective-C source file file.s assembly language file file.o object file a.out link edited output TMPDIR/cc* temporary files LIBDIR/cpp preprocessor LIBDIR/cc1 compiler for C LIBDIR/cc1plus compiler for C++ LIBDIR/collect linker front end needed on some machines LIBDIR/libgcc.a GCC subroutine library /lib/crt[01n].o start-up routine LIBDIR/ccrt0 additional start-up routine for C++ /lib/libc.a standard C library, 参阅 man page intro(3) /usr/include standard directory for #include files LIBDIR/include standard gcc directory for #include files LIBDIR/g++-include additional g++ directory for #include LIBDIR is usually /usr/local/lib/machine/version. TMPDIR comes from the environment variable TMPDIR (default /usr/tmp if available, else /tmp).
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