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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the "with...Texts." line with this: with the Invariant Sections being LIST THEIR TITLES, with the Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST. If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation. If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.  File: gccinstall.info, Node: Concept Index, Prev: GNU Free Documentation License, Up: Top Concept Index ************* [index] * Menu: * Binaries: Binaries. (line 6) * Configuration: Configuration. (line 6) * configurations supported by GCC: Configurations. (line 6) * Downloading GCC: Downloading the source. (line 6) * Downloading the Source: Downloading the source. (line 6) * FDL, GNU Free Documentation License: GNU Free Documentation License. (line 6) * Host specific installation: Specific. (line 6) * Installing GCC: Binaries: Binaries. (line 6) * Installing GCC: Building: Building. (line 6) * Installing GCC: Configuration: Configuration. (line 6) * Installing GCC: Testing: Testing. (line 6) * Prerequisites: Prerequisites. (line 6) * Specific: Specific. (line 6) * Specific installation notes: Specific. (line 6) * Target specific installation: Specific. (line 6) * Target specific installation notes: Specific. (line 6) * Testing: Testing. (line 6) * Testsuite: Testing. (line 6)  Tag Table: Node: Top2001 Node: Installing GCC2559 Node: Prerequisites4074 Node: Downloading the source11917 Node: Configuration13551 Ref: with-gnu-as26970 Ref: with-as28200 Ref: with-gnu-ld29613 Node: Building62116 Node: Testing74185 Node: Final install81965 Node: Binaries87195 Node: Specific89059 Ref: alpha-x-x89565 Ref: alpha-dec-osf90054 Ref: alphaev5-cray-unicosmk93172 Ref: arc-x-elf94092 Ref: arm-x-elf94192 Ref: xscale-x-x94213 Ref: arm-x-coff94449 Ref: arm-x-aout94651 Ref: avr94773 Ref: bfin95415 Ref: cris95657 Ref: crx96639 Ref: dos97302 Ref: x-x-freebsd97625 Ref: h8300-hms100008 Ref: hppa-hp-hpux100360 Ref: hppa-hp-hpux10102848 Ref: hppa-hp-hpux11103905 Ref: x-x-linux-gnu110773 Ref: ix86-x-linuxaout110966 Ref: ix86-x-linux111125 Ref: ix86-x-sco32v5111438 Ref: ix86-x-solaris210113607 Ref: ix86-x-udk113993 Ref: ia64-x-linux115346 Ref: ia64-x-hpux116116 Ref: x-ibm-aix116671 Ref: iq2000-x-elf122654 Ref: m32c-x-elf122794 Ref: m32r-x-elf122896 Ref: m6811-elf122998 Ref: m6812-elf123148 Ref: m68k-x-x123298 Ref: m68k-hp-hpux124260 Ref: m68k-x-uclinux125999 Ref: mips-x-x126362 Ref: mips-sgi-irix5129039 Ref: mips-sgi-irix6129987 Ref: powerpc-x-x132794 Ref: powerpc-x-darwin132939 Ref: powerpc-x-elf133486 Ref: powerpc-x-linux-gnu133605 Ref: powerpc-x-netbsd133707 Ref: powerpc-x-eabisim133903 Ref: powerpc-x-eabi134029 Ref: powerpcle-x-elf134105 Ref: powerpcle-x-eabisim134235 Ref: powerpcle-x-eabi134368 Ref: s390-x-linux134451 Ref: s390x-x-linux134523 Ref: s390x-ibm-tpf134610 Ref: x-x-solaris2134741 Ref: sparc-sun-solaris2138769 Ref: sparc-sun-solaris27141933 Ref: sparc-x-linux144397 Ref: sparc64-x-solaris2144622 Ref: sparcv9-x-solaris2145267 Ref: x-x-sysv145352 Ref: vax-dec-ultrix146313 Ref: x-x-vxworks146465 Ref: x86-64-x-x147987 Ref: xtensa-x-elf148315 Ref: xtensa-x-linux148984 Ref: windows149322 Ref: os2149792 Ref: older149983 Ref: elf152100 Node: Old152358 Node: Configurations155495 Node: GNU Free Documentation License159477 Node: Concept Index181893  End Tag Table This is doc/gcc.info, produced by makeinfo version 4.12 from /usr/local/home/bellard/cpux86/rootdisk/buildroot-2011.02/output/toolchain/gcc-4.3.5/gcc/doc/gcc.texi. Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 2008 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with the Invariant Sections being "GNU General Public License" and "Funding Free Software", the Front-Cover texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled "GNU Free Documentation License". (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development. INFO-DIR-SECTION Software development START-INFO-DIR-ENTRY * gcc: (gcc). The GNU Compiler Collection. * g++: (gcc). The GNU C++ compiler. END-INFO-DIR-ENTRY This file documents the use of the GNU compilers. Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 2008 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with the Invariant Sections being "GNU General Public License" and "Funding Free Software", the Front-Cover texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled "GNU Free Documentation License". (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.  File: gcc.info, Node: Top, Next: G++ and GCC, Up: (DIR) Introduction ************ This manual documents how to use the GNU compilers, as well as their features and incompatibilities, and how to report bugs. It corresponds to the compilers (Buildroot 2011.02) version 4.3.5. The internals of the GNU compilers, including how to port them to new targets and some information about how to write front ends for new languages, are documented in a separate manual. *Note Introduction: (gccint)Top. * Menu: * G++ and GCC:: You can compile C or C++ programs. * Standards:: Language standards supported by GCC. * Invoking GCC:: Command options supported by `gcc'. * C Implementation:: How GCC implements the ISO C specification. * C Extensions:: GNU extensions to the C language family. * C++ Extensions:: GNU extensions to the C++ language. * Objective-C:: GNU Objective-C runtime features. * Compatibility:: Binary Compatibility * Gcov:: `gcov'---a test coverage program. * Trouble:: If you have trouble using GCC. * Bugs:: How, why and where to report bugs. * Service:: How to find suppliers of support for GCC. * Contributing:: How to contribute to testing and developing GCC. * Funding:: How to help assure funding for free software. * GNU Project:: The GNU Project and GNU/Linux. * Copying:: GNU General Public License says how you can copy and share GCC. * GNU Free Documentation License:: How you can copy and share this manual. * Contributors:: People who have contributed to GCC. * Option Index:: Index to command line options. * Keyword Index:: Index of concepts and symbol names.  File: gcc.info, Node: G++ and GCC, Next: Standards, Prev: Top, Up: Top 1 Programming Languages Supported by GCC **************************************** GCC stands for "GNU Compiler Collection". GCC is an integrated distribution of compilers for several major programming languages. These languages currently include C, C++, Objective-C, Objective-C++, Java, Fortran, and Ada. The abbreviation "GCC" has multiple meanings in common use. The current official meaning is "GNU Compiler Collection", which refers generically to the complete suite of tools. The name historically stood for "GNU C Compiler", and this usage is still common when the emphasis is on compiling C programs. Finally, the name is also used when speaking of the "language-independent" component of GCC: code shared among the compilers for all supported languages. The language-independent component of GCC includes the majority of the optimizers, as well as the "back ends" that generate machine code for various processors. The part of a compiler that is specific to a particular language is called the "front end". In addition to the front ends that are integrated components of GCC, there are several other front ends that are maintained separately. These support languages such as Pascal, Mercury, and COBOL. To use these, they must be built together with GCC proper. Most of the compilers for languages other than C have their own names. The C++ compiler is G++, the Ada compiler is GNAT, and so on. When we talk about compiling one of those languages, we might refer to that compiler by its own name, or as GCC. Either is correct. Historically, compilers for many languages, including C++ and Fortran, have been implemented as "preprocessors" which emit another high level language such as C. None of the compilers included in GCC are implemented this way; they all generate machine code directly. This sort of preprocessor should not be confused with the "C preprocessor", which is an integral feature of the C, C++, Objective-C and Objective-C++ languages.  File: gcc.info, Node: Standards, Next: Invoking GCC, Prev: G++ and GCC, Up: Top 2 Language Standards Supported by GCC ************************************* For each language compiled by GCC for which there is a standard, GCC attempts to follow one or more versions of that standard, possibly with some exceptions, and possibly with some extensions. 2.1 C language ============== GCC supports three versions of the C standard, although support for the most recent version is not yet complete. The original ANSI C standard (X3.159-1989) was ratified in 1989 and published in 1990. This standard was ratified as an ISO standard (ISO/IEC 9899:1990) later in 1990. There were no technical differences between these publications, although the sections of the ANSI standard were renumbered and became clauses in the ISO standard. This standard, in both its forms, is commonly known as "C89", or occasionally as "C90", from the dates of ratification. The ANSI standard, but not the ISO standard, also came with a Rationale document. To select this standard in GCC, use one of the options `-ansi', `-std=c89' or `-std=iso9899:1990'; to obtain all the diagnostics required by the standard, you should also specify `-pedantic' (or `-pedantic-errors' if you want them to be errors rather than warnings). *Note Options Controlling C Dialect: C Dialect Options. Errors in the 1990 ISO C standard were corrected in two Technical Corrigenda published in 1994 and 1996. GCC does not support the uncorrected version. An amendment to the 1990 standard was published in 1995. This amendment added digraphs and `__STDC_VERSION__' to the language, but otherwise concerned the library. This amendment is commonly known as "AMD1"; the amended standard is sometimes known as "C94" or "C95". To select this standard in GCC, use the option `-std=iso9899:199409' (with, as for other standard versions, `-pedantic' to receive all required diagnostics). A new edition of the ISO C standard was published in 1999 as ISO/IEC 9899:1999, and is commonly known as "C99". GCC has incomplete support for this standard version; see `http://gcc.gnu.org/gcc-4.3/c99status.html' for details. To select this standard, use `-std=c99' or `-std=iso9899:1999'. (While in development, drafts of this standard version were referred to as "C9X".) Errors in the 1999 ISO C standard were corrected in three Technical Corrigenda published in 2001, 2004 and 2007. GCC does not support the uncorrected version. By default, GCC provides some extensions to the C language that on rare occasions conflict with the C standard. *Note Extensions to the C Language Family: C Extensions. Use of the `-std' options listed above will disable these extensions where they conflict with the C standard version selected. You may also select an extended version of the C language explicitly with `-std=gnu89' (for C89 with GNU extensions) or `-std=gnu99' (for C99 with GNU extensions). The default, if no C language dialect options are given, is `-std=gnu89'; this will change to `-std=gnu99' in some future release when the C99 support is complete. Some features that are part of the C99 standard are accepted as extensions in C89 mode. The ISO C standard defines (in clause 4) two classes of conforming implementation. A "conforming hosted implementation" supports the whole standard including all the library facilities; a "conforming freestanding implementation" is only required to provide certain library facilities: those in `', `', `', and `'; since AMD1, also those in `'; and in C99, also those in `' and `'. In addition, complex types, added in C99, are not required for freestanding implementations. The standard also defines two environments for programs, a "freestanding environment", required of all implementations and which may not have library facilities beyond those required of freestanding implementations, where the handling of program startup and termination are implementation-defined, and a "hosted environment", which is not required, in which all the library facilities are provided and startup is through a function `int main (void)' or `int main (int, char *[])'. An OS kernel would be a freestanding environment; a program using the facilities of an operating system would normally be in a hosted implementation. GCC aims towards being usable as a conforming freestanding implementation, or as the compiler for a conforming hosted implementation. By default, it will act as the compiler for a hosted implementation, defining `__STDC_HOSTED__' as `1' and presuming that when the names of ISO C functions are used, they have the semantics defined in the standard. To make it act as a conforming freestanding implementation for a freestanding environment, use the option `-ffreestanding'; it will then define `__STDC_HOSTED__' to `0' and not make assumptions about the meanings of function names from the standard library, with exceptions noted below. To build an OS kernel, you may well still need to make your own arrangements for linking and startup. *Note Options Controlling C Dialect: C Dialect Options. GCC does not provide the library facilities required only of hosted implementations, nor yet all the facilities required by C99 of freestanding implementations; to use the facilities of a hosted environment, you will need to find them elsewhere (for example, in the GNU C library). *Note Standard Libraries: Standard Libraries. Most of the compiler support routines used by GCC are present in `libgcc', but there are a few exceptions. GCC requires the freestanding environment provide `memcpy', `memmove', `memset' and `memcmp'. Finally, if `__builtin_trap' is used, and the target does not implement the `trap' pattern, then GCC will emit a call to `abort'. For references to Technical Corrigenda, Rationale documents and information concerning the history of C that is available online, see `http://gcc.gnu.org/readings.html' 2.2 C++ language ================ GCC supports the ISO C++ standard (1998) and contains experimental support for the upcoming ISO C++ standard (200x). The original ISO C++ standard was published as the ISO standard (ISO/IEC 14882:1998) and amended by a Technical Corrigenda published in 2003 (I'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~šÚĚŚƚǚȚɚʚ˚͚̚ΚϚКњҚӚԚ՚֚ךؚٚښۚܚݚޚߚ  !"#$%&SO/IEC 14882:2003). These standards are referred to as C++98 and C++03, respectively. GCC implements the majority of C++98 (`export' is a notable exception) and most of the changes in C++03. To select this standard in GCC, use one of the options `-ansi' or `-std=c++98'; to obtain all the diagnostics required by the standard, you should also specify `-pedantic' (or `-pedantic-errors' if you want them to be errors rather than warnings). The ISO C++ committee is working on a new ISO C++ standard, dubbed C++0x, that is intended to be published by 2009. C++0x contains several changes to the C++ language, some of which have been implemented in an experimental C++0x mode in GCC. The C++0x mode in GCC tracks the draft working paper for the C++0x standard; the latest working paper is available on the ISO C++ committee's web site at `http://www.open-std.org/jtc1/sc22/wg21/'. For information regarding the C++0x features available in the experimental C++0x mode, see `http://gcc.gnu.org/gcc-4.3/cxx0x_status.html'. To select this standard in GCC, use the option `-std=c++0x'; to obtain all the diagnostics required by the standard, you should also specify `-pedantic' (or `-pedantic-errors' if you want them to be errors rather than warnings). By default, GCC provides some extensions to the C++ language; *Note Options Controlling C++ Dialect: C++ Dialect Options. Use of the `-std' option listed above will disable these extensions. You may also select an extended version of the C++ language explicitly with `-std=gnu++98' (for C++98 with GNU extensions) or `-std=gnu++0x' (for C++0x with GNU extensions). The default, if no C++ language dialect options are given, is `-std=gnu++98'. 2.3 Objective-C and Objective-C++ languages =========================================== There is no formal written standard for Objective-C or Objective-C++. The most authoritative manual is "Object-Oriented Programming and the Objective-C Language", available at a number of web sites: * `http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/' is a recent (and periodically updated) version; * `http://www.toodarkpark.org/computers/objc/' is an older example; * `http://www.gnustep.org' and `http://gcc.gnu.org/readings.html' have additional useful information. 2.4 Treelang language ===================== There is no standard for treelang, which is a sample language front end for GCC. Its only purpose is as a sample for people wishing to write a new language for GCC. The language is documented in `gcc/treelang/treelang.texi' which can be turned into info or HTML format. *Note GNAT Reference Manual: (gnat_rm)Top, for information on standard conformance and compatibility of the Ada compiler. *Note Standards: (gfortran)Standards, for details of standards supported by GNU Fortran. *Note Compatibility with the Java Platform: (gcj)Compatibility, for details of compatibility between `gcj' and the Java Platform.  File: gcc.info, Node: Invoking GCC, Next: C Implementation, Prev: Standards, Up: Top 3 GCC Command Options ********************* When you invoke GCC, it normally does preprocessing, compilation, assembly and linking. The "overall options" allow you to stop this process at an intermediate stage. For example, the `-c' option says not to run the linker. Then the output consists of object files output by the assembler. Other options are passed on to one stage of processing. Some options control the preprocessor and others the compiler itself. Yet other options control the assembler and linker; most of these are not documented here, since you rarely need to use any of them. Most of the command line options that you can use with GCC are useful for C programs; when an option is only useful with another language (usually C++), the explanation says so explicitly. If the description for a particular option does not mention a source language, you can use that option with all supported languages. *Note Compiling C++ Programs: Invoking G++, for a summary of special options for compiling C++ programs. The `gcc' program accepts options and file names as operands. Many options have multi-letter names; therefore multiple single-letter options may _not_ be grouped: `-dr' is very different from `-d -r'. You can mix options and other arguments. For the most part, the order you use doesn't matter. Order does matter when you use several options of the same kind; for example, if you specify `-L' more than once, the directories are searched in the order specified. Also, the placement of the `-l' option is significant. Many options have long names starting with `-f' or with `-W'--for example, `-fmove-loop-invariants', `-Wformat' and so on. Most of these have both positive and negative forms; the negative form of `-ffoo' would be `-fno-foo'. This manual documents only one of these two forms, whichever one is not the default. *Note Option Index::, for an index to GCC's options. * Menu: * Option Summary:: Brief list of all options, without explanations. * Overall Options:: Controlling the kind of output: an executable, object files, assembler files, or preprocessed source. * Invoking G++:: Compiling C++ programs. * C Dialect Options:: Controlling the variant of C language compiled. * C++ Dialect Options:: Variations on C++. * Objective-C and Objective-C++ Dialect Options:: Variations on Objective-C and Objective-C++. * Language Independent Options:: Controlling how diagnostics should be formatted. * 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. * Spec Files:: How to pass switches to sub-processes. * Target Options:: Running a cross-compiler, or an old version of GCC. * Submodel Options:: Specifying minor hardware or convention variations, such as 68010 vs 68020. * Code Gen Options:: Specifying conventions for function calls, data layout and register usage. * Environment Variables:: Env vars that affect GCC. * Precompiled Headers:: Compiling a header once, and using it many times. * Running Protoize:: Automatically adding or removing function prototypes.  File: gcc.info, Node: Option Summary, Next: Overall Options, Up: Invoking GCC 3.1 Option Summary ================== Here is a summary of all the options, grouped by type. Explanations are in the following sections. _Overall Options_ *Note Options Controlling the Kind of Output: Overall Options. -c -S -E -o FILE -combine -pipe -pass-exit-codes -x LANGUAGE -v -### --help[=CLASS] --target-help --version @FILE _C Language Options_ *Note Options Controlling C Dialect: C Dialect Options. -ansi -std=STANDARD -fgnu89-inline -aux-info FILENAME -fno-asm -fno-builtin -fno-builtin-FUNCTION -fhosted -ffreestanding -fopenmp -fms-extensions -trigraphs -no-integrated-cpp -traditional -traditional-cpp -fallow-single-precision -fcond-mismatch -flax-vector-conversions -fsigned-bitfields -fsigned-char -funsigned-bitfields -funsigned-char _C++ Language Options_ *Note Options Controlling C++ Dialect: C++ Dialect Options. -fabi-version=N -fno-access-control -fcheck-new -fconserve-space -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 -fno-operator-names -fno-optional-diags -fpermissive -frepo -fno-rtti -fstats -ftemplate-depth-N -fno-threadsafe-statics -fuse-cxa-atexit -fno-weak -nostdinc++ -fno-default-inline -fvisibility-inlines-hidden -fvisibility-ms-compat -Wabi -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Weffc++ -Wno-deprecated -Wstrict-null-sentinel -Wno-non-template-friend -Wold-style-cast -Woverloaded-virtual -Wno-pmf-conversions -Wsign-promo _Objective-C and Objective-C++ Language Options_ *Note Options Controlling Objective-C and Objective-C++ Dialects: Objective-C and Objective-C++ Dialect Options. -fconstant-string-class=CLASS-NAME -fgnu-runtime -fnext-runtime -fno-nil-receivers -fobjc-call-cxx-cdtors -fobjc-direct-dispatch -fobjc-exceptions -fobjc-gc -freplace-objc-classes -fzero-link -gen-decls -Wassign-intercept -Wno-protocol -Wselector -Wstrict-selector-match -Wundeclared-selector _Language Independent Options_ *Note Options to Control Diagnostic Messages Formatting: Language Independent Options. -fmessage-length=N -fdiagnostics-show-location=[once|every-line] -fdiagnostics-show-option _Warning Options_ *Note Options to Request or Suppress Warnings: Warning Options. -fsyntax-only -pedantic -pedantic-errors -w -Wextra -Wall -Waddress -Waggregate-return -Warray-bounds -Wno-attributes -Wc++-compat -Wc++0x-compat -Wcast-align -Wcast-qual -Wchar-subscripts -Wclobbered -Wcomment -Wconversion -Wcoverage-mismatch -Wno-deprecated-declarations -Wdisabled-optimization -Wno-div-by-zero -Wempty-body -Wno-endif-labels -Werror -Werror=* -Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 -Wno-format-extra-args -Wformat-nonliteral -Wformat-security -Wformat-y2k -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wimport -Wno-import -Winit-self -Winline -Wno-int-to-pointer-cast -Wno-invalid-offsetof -Winvalid-pch -Wlarger-than-LEN -Wunsafe-loop-optimizations -Wlogical-op -Wlong-long -Wmain -Wmissing-braces -Wmissing-field-initializers -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wno-multichar -Wnonnull -Wno-overflow -Woverlength-strings -Wpacked -Wpadded -Wparentheses -Wpointer-arith -Wno-pointer-to-int-cast -Wredundant-decls -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wsign-conversion -Wstack-protector -Wstrict-aliasing -Wstrict-aliasing=n -Wstrict-overflow -Wstrict-overflow=N -Wswitch -Wswitch-default -Wswitch-enum -Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized -Wunknown-pragmas -Wno-pragmas -Wunreachable-code -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value -Wunused-variable -Wvariadic-macros -Wvla -Wvolatile-register-var -Wwrite-strings _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_ *Note Options for Debugging Your Program or GCC: Debugging Options. -dLETTERS -dumpspecs -dumpmachine -dumpversion -fdbg-cnt-list -fdbg-cnt=COUNTER-VALUE-LIST -fdump-noaddr -fdump-unnumbered -fdump-translation-unit[-N] -fdump-class-hierarchy[-N] -fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline -fdump-tree-all -fdump-tree-original[-N] -fdump-tree-optimized[-N] -fdump-tree-cfg -fdump-tree-vcg -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-mudflap[-N] -fdump-tree-dom[-N] -fdump-tree-dse[-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-salias -fdump-tree-fre[-N] -fdump-tree-vrp[-N] -ftree-vectorizer-verbose=N -fdump-tree-storeccp[-N] -feliminate-dwarf2-dups -feliminate-unused-debug-types -feliminate-unused-debug-symbols -femit-class-debug-always -fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report -fprofile-arcs -frandom-seed=STRING -fsched-verbose=N -ftest-coverage -ftime-report -fvar-tracking -g -gLEVEL -gcoff -gdwarf-2 -ggdb -gstabs -gstabs+ -gvms -gxcoff -gxcoff+ -fno-merge-debug-strings -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-prog-name=PROGRAM -print-search-dirs -Q -print-sysroot-headers-suffix -save-temps -time _Optimization Options_ *Note Options that Control Optimization: Optimize Options. -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 -fcprop-registers -fcrossjumping -fcse-follow-jumps -fcse-skip-blocks -fcx-limited-range -fdata-sections -fdce -fdce -fdelayed-branch -fdelete-null-pointer-checks -fdse -fdse -fearly-inlining -fexpensive-optimizations -ffast-math -ffinite-math-only -ffloat-store -fforward-propagate -ffunction-sections -fgcse -fgcse-after-reload -fgcse-las -fgcse-lm -fgcse-sm -fif-conversion -fif-conversion2 -finline-functions -finline-functions-called-once -finline-limit=N -finline-small-functions -fipa-cp -fipa-matrix-reorg -fipa-pta -fipa-pure-const -fipa-reference -fipa-struct-reorg -fipa-type-escape -fivopts -fkeep-inline-functions -fkeep-static-consts -fmerge-all-constants -fmerge-constants -fmodulo-sched -fmodulo-sched-allow-regmoves -fmove-loop-invariants -fmudflap -fmudflapir -fmudflapth -fno-branch-count-reg -fno-default-inline -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-register-move -foptimize-sibling-calls -fpeel-loops -fpredictive-commoning -fprefetch-loop-arrays -fprofile-generate -fprofile-use -fprofile-values -freciprocal-math -fregmove -frename-registers -freorder-blocks -freorder-blocks-and-partition -freorder-functions -frerun-cse-after-loop -freschedule-modulo-scheduled-loops -frounding-math -frtl-abstract-sequences -fsched2-use-superblocks -fsched2-use-traces -fsched-spec-load -fsched-spec-load-dangerous -fsched-stalled-insns-dep[=N] -fsched-stalled-insns[=N] -fschedule-insns -fschedule-insns2 -fsection-anchors -fsee -fsignaling-nans -fsingle-precision-constant -fsplit-ivs-in-unroller -fsplit-wide-types -fstack-protector -fstack-protector-all -fstrict-aliasing -fstrict-overflow -fthread-jumps -ftracer -ftree-ccp -ftree-ch -ftree-copy-prop -ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse -ftree-fre -ftree-loop-im -ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize -ftree-parallelize-loops=N -ftree-pre -ftree-reassoc -ftree-salias -ftree-sink -ftree-sra -ftree-store-ccp -ftree-ter -ftree-vect-loop-version -ftree-vectorize -ftree-vrp -funit-at-a-time -funroll-all-loops -funroll-loops -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops -fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb -fwhole-program --param NAME=VALUE -O -O0 -O1 -O2 -O3 -Os _Preprocessor Options_ *Note Options Controlling the Preprocessor: Preprocessor Options. -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 -fworking-directory -remap -trigraphs -undef -UMACRO -Wp,OPTION -Xpreprocessor OPTION _Assembler Option_ *Note Passing Options to the Assembler: Assembler Options. -Wa,OPTION -Xassembler OPTION _Linker Options_ *Note Options for Linking: Link Options. OBJECT-FILE-NAME -lLIBRARY -nostartfiles -nodefaultlibs -nostdlib -pie -rdynamic -s -static -static-libgcc -shared -shared-libgcc -symbolic -Wl,OPTION -Xlinker OPTION -u SYMBOL _Directory Options_ *Note Options for Directory Search: Directory Options. -BPREFIX -IDIR -iquoteDIR -LDIR -specs=FILE -I- --sysroot=DIR _Target Options_ *Note Target Options::. -V VERSION -b MACHINE _Machine Dependent Options_ *Note Hardware Models and Configurations: Submodel Options. _ARC Options_ -EB -EL -mmangle-cpu -mcpu=CPU -mtext=TEXT-SECTION -mdata=DATA-SECTION -mrodata=READONLY-DATA-SECTION _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 -mwords-little-endian -mfloat-abi=NAME -msoft-float -mhard-float -mfpe -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 -mcirrus-fix-invalid-insns -mno-cirrus-fix-invalid-insns -mpoke-function-name -mthumb -marm -mtpcs-frame -mtpcs-leaf-frame -mcaller-super-interworking -mcallee-super-interworking -mtp=NAME _AVR Options_ -mmcu=MCU -msize -minit-stack=N -mno-interrupts -mcall-prologues -mno-tablejump -mtiny-stack -mint8 _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 _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 _CRX Options_ -mmac -mpush-args _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 -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 -mtune=CPU-TYPE -mbwx -mmax -mfix -mcix -mfloat-vax -mfloat-ieee -mexplicit-relocs -msmall-data -mlarge-data -msmall-text -mlarge-text -mmemory-latency=TIME _DEC Alpha/VMS Options_ -mvms-return-codes _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_ -muclibc _H8/300 Options_ -mrelax -mh -ms -mn -mint32 -malign-300 _HPPA Options_ -march=ARCHITECTURE-TYPE -mbig-switch -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-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 -msio -mwsio -munix=UNIX-STD -nolibdld -static -threads _i386 and x86-64 Options_ -mtune=CPU-TYPE -march=CPU-TYPE -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 -mcld -mcx16 -msahf -mrecip -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -msse4a -m3dnow -mpopcnt -mabm -msse5 -mthreads -mno-align-stringops -minline-all-stringops -mpush-args -maccumulate-outgoing-args -m128bit-long-double -m96bit-long-double -mregparm=NUM -msseregparm -mveclibabi=TYPE -mpc32 -mpc64 -mpc80 -mstackrealign -momit-leaf-frame-pointer -mno-red-zone -mno-tls-direct-seg-refs -mcmodel=CODE-MODEL -m32 -m64 -mlarge-data-threshold=NUM -mfused-madd -mno-fused-madd _IA-64 Options_ -mbig-endian -mlittle-endian -mgnu-as -mgnu-ld -mno-pic -mvolatile-asm-stop -mregister-names -mno-sdata -mconstant-gp -mauto-pic -minline-float-divide-min-latency