; Options for the C, ObjC, C++ and ObjC++ front ends. ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 ; Free Software Foundation, Inc. ; ; This file is part of GCC. ; ; GCC is free software; you can redistribute it and/or modify it under ; the terms of the GNU General Public License as published by the Free ; Software Foundation; either version 3, or (at your option) any later ; version. ; ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY ; WARRANTY; without even the implied warranty of MERCHANTABILITY or ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License ; for more details. ; ; You should have received a copy of the GNU General Public License ; along with GCC; see the file COPYING3. If not see ; . ; See the GCC internals manual for a description of this file's format. ; Please try to keep this file in ASCII collating order. Language C Language ObjC Language C++ Language ObjC++ -output-pch= C ObjC C++ ObjC++ Joined Separate A C ObjC C++ ObjC++ Joined Separate -A= Assert the to . Putting '-' before disables the to C C ObjC C++ ObjC++ Do not discard comments CC C ObjC C++ ObjC++ Do not discard comments in macro expansions D C ObjC C++ ObjC++ Joined Separate -D[=] Define a with as its value. If just is given, is taken to be 1 E C ObjC C++ ObjC++ Undocumented F C ObjC C++ ObjC++ Joined Separate -F Add to the end of the main framework include path H C ObjC C++ ObjC++ Print the name of header files as they are used I C ObjC C++ ObjC++ Joined Separate -I Add to the end of the main include path M C ObjC C++ ObjC++ Generate make dependencies MD C ObjC C++ ObjC++ Separate Generate make dependencies and compile MF C ObjC C++ ObjC++ Joined Separate -MF Write dependency output to the given file MG C ObjC C++ ObjC++ Treat missing header files as generated files MM C ObjC C++ ObjC++ Like -M but ignore system header files MMD C ObjC C++ ObjC++ Separate Like -MD but ignore system header files MP C ObjC C++ ObjC++ Generate phony targets for all headers MQ C ObjC C++ ObjC++ Joined Separate -MQ Add a MAKE-quoted target MT C ObjC C++ ObjC++ Joined Separate -MT Add an unquoted target P C ObjC C++ ObjC++ Do not generate #line directives U C ObjC C++ ObjC++ Joined Separate -U Undefine Wabi C ObjC C++ ObjC++ Var(warn_abi) Warning Warn about things that will change when compiling with an ABI-compliant compiler Wpsabi C ObjC C++ ObjC++ Var(warn_psabi) Init(1) Undocumented Waddress C ObjC C++ ObjC++ Var(warn_address) Warning Warn about suspicious uses of memory addresses Wall C ObjC C++ ObjC++ Warning Enable most warning messages Wassign-intercept ObjC ObjC++ Var(warn_assign_intercept) Warning Warn whenever an Objective-C assignment is being intercepted by the garbage collector Wbad-function-cast C ObjC Var(warn_bad_function_cast) Warning Warn about casting functions to incompatible types Wbuiltin-macro-redefined C ObjC C++ ObjC++ Warning Warn when a built-in preprocessor macro is undefined or redefined Wc++-compat C ObjC Var(warn_cxx_compat) Warning Warn about C constructs that are not in the common subset of C and C++ Wc++0x-compat C++ ObjC++ Var(warn_cxx0x_compat) Warning Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x Wcast-qual C ObjC C++ ObjC++ Var(warn_cast_qual) Warning Warn about casts which discard qualifiers Wchar-subscripts C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning Warn about subscripts whose type is \"char\" Wclobbered C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning Warn about variables that might be changed by \"longjmp\" or \"vfork\" Wcomment C ObjC C++ ObjC++ Warning Warn about possibly nested block comments, and C++ comments spanning more than one physical line Wcomments C ObjC C++ ObjC++ Warning Synonym for -Wcomment Wconversion C ObjC C++ ObjC++ Var(warn_conversion) Warning Warn for implicit type conversions that may change a value Wsign-conversion C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1) Warn for implicit type conversions between signed and unsigned integers Wctor-dtor-privacy C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning Warn when all constructors and destructors are private Wdeclaration-after-statement C ObjC Var(warn_declaration_after_statement) Warning Warn when a declaration is found after a statement Wdeprecated C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning Warn if a deprecated compiler feature, class, method, or field is used Wdiv-by-zero C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning Warn about compile-time integer division by zero Weffc++ C++ ObjC++ Var(warn_ecpp) Warning Warn about violations of Effective C++ style rules Wempty-body C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning Warn about an empty body in an if or else statement Wendif-labels C ObjC C++ ObjC++ Warning Warn about stray tokens after #elif and #endif Wenum-compare C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning Warn about comparison of different enum types Werror C ObjC C++ ObjC++ ; Documented in common.opt Werror-implicit-function-declaration C ObjC RejectNegative Warning This switch is deprecated; use -Werror=implicit-function-declaration instead Wfloat-equal C ObjC C++ ObjC++ Var(warn_float_equal) Warning Warn if testing floating point numbers for equality Wformat C ObjC C++ ObjC++ Warning Warn about printf/scanf/strftime/strfmon format string anomalies Wformat-extra-args C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning Warn if passing too many arguments to a function for its format string Wformat-nonliteral C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning Warn about format strings that are not literals Wformat-contains-nul C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning Warn about format strings that contain NUL bytes Wformat-security C ObjC C++ ObjC++ Var(warn_format_security) Warning Warn about possible security problems with format functions Wformat-y2k C ObjC C++ ObjC++ Var(warn_format_y2k) Warning Warn about strftime formats yielding 2-digit years Wformat-zero-length C ObjC Var(warn_format_zero_length) Warning Warn about zero-length formats Wformat= C ObjC C++ ObjC++ Joined Warning Wignored-qualifiers C C++ Var(warn_ignored_qualifiers) Init(-1) Warning Warn whenever type qualifiers are ignored. Winit-self C ObjC C++ ObjC++ Var(warn_init_self) Warning Warn about variables which are initialized to themselves Wimplicit C ObjC C++ ObjC++ Warning Wimplicit-function-declaration C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning Warn about implicit function declarations Wimplicit-int C ObjC Var(warn_implicit_int) Warning Warn when a declaration does not specify a type Wimport C ObjC C++ ObjC++ Undocumented Wint-to-pointer-cast C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning Warn when there is a cast to a pointer from an integer of a different size Winvalid-offsetof C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning Warn about invalid uses of the \"offsetof\" macro Winvalid-pch C ObjC C++ ObjC++ Warning Warn about PCH files that are found but not used Wlogical-op C ObjC C++ ObjC++ Var(warn_logical_op) Init(-1) Warning Warn when a logical operator is suspiciously always evaluating to true or false Wlong-long C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning Do not warn about using \"long long\" when -pedantic Wmain C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning Warn about suspicious declarations of \"main\" Wmissing-braces C ObjC C++ ObjC++ Var(warn_missing_braces) Warning Warn about possibly missing braces around initializers Wmissing-declarations C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning Warn about global functions without previous declarations Wmissing-field-initializers C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning Warn about missing fields in struct initializers Wmissing-format-attribute C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning Warn about functions which might be candidates for format attributes Wmissing-include-dirs C ObjC C++ ObjC++ Warning Warn about user-specified include directories that do not exist Wmissing-parameter-type C ObjC Var(warn_missing_parameter_type) Init(-1) Warning Warn about function parameters declared without a type specifier in K&R-style functions Wmissing-prototypes C ObjC Var(warn_missing_prototypes) Warning Warn about global functions without prototypes Wmultichar C ObjC C++ ObjC++ Warning Warn about use of multi-character character constants Wnested-externs C ObjC Var(warn_nested_externs) Warning Warn about \"extern\" declarations not at file scope Wnon-template-friend C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning Warn when non-templatized friend functions are declared within a template Wnon-virtual-dtor C++ ObjC++ Var(warn_nonvdtor) Warning Warn about non-virtual destructors Wnonnull C ObjC Var(warn_nonnull) Warning Warn about NULL being passed to argument slots marked as requiring non-NULL Wnormalized= C ObjC C++ ObjC++ Joined Warning -Wnormalized= Warn about non-normalised Unicode strings Wold-style-cast C++ ObjC++ Var(warn_old_style_cast) Warning Warn if a C-style cast is used in a program Wold-style-declaration C ObjC Var(warn_old_style_declaration) Init(-1) Warning Warn for obsolescent usage in a declaration Wold-style-definition C ObjC Var(warn_old_style_definition) Warning Warn if an old-style parameter definition is used Woverlength-strings C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning Warn if a string is longer than the maximum portable length specified by the standard Woverloaded-virtual C++ ObjC++ Var(warn_overloaded_virtual) Warning Warn about overloaded virtual function names Woverride-init C ObjC Var(warn_override_init) Init(-1) Warning Warn about overriding initializers without side effects Wpacked-bitfield-compat C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning Warn about packed bit-fields whose offset changed in GCC 4.4 Wparentheses C ObjC C++ ObjC++ Var(warn_parentheses) Warning Warn about possibly missing parentheses Wpmf-conversions C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning Warn when converting the type of pointers to member functions Wpointer-arith C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning Warn about function pointer arithmetic Wpointer-to-int-cast C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning Warn when a pointer is cast to an integer of a different size Wpragmas C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning Warn about misuses of pragmas Wprotocol ObjC ObjC++ Var(warn_protocol) Init(1) Warning Warn if inherited methods are unimplemented Wredundant-decls C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning Warn about multiple declarations of the same object Wreorder C++ ObjC++ Var(warn_reorder) Warning Warn when the compiler reorders code Wreturn-type C ObjC C++ ObjC++ Var(warn_return_type) Warning Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++) Wselector ObjC ObjC++ Var(warn_selector) Warning Warn if a selector has multiple methods Wsequence-point C ObjC C++ ObjC++ Var(warn_sequence_point) Warning Warn about possible violations of sequence point rules Wsign-compare C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning Warn about signed-unsigned comparisons Wsign-promo C++ ObjC++ Var(warn_sign_promo) Warning Warn when overload promotes from unsigned to signed Wstrict-null-sentinel C++ ObjC++ Warning Warn about uncasted NULL used as sentinel Wstrict-prototypes C ObjC Var(warn_strict_prototypes) Warning Warn about unprototyped function declarations Wstrict-selector-match ObjC ObjC++ Var(warn_strict_selector_match) Warning Warn if type signatures of candidate methods do not match exactly Wsync-nand C C++ Var(warn_sync_nand) Init(1) Warning Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used Wsynth C++ ObjC++ Var(warn_synth) Warning Deprecated. This switch has no effect Wsystem-headers C ObjC C++ ObjC++ Warning ; Documented in common.opt Wtraditional C ObjC Var(warn_traditional) Warning Warn about features not present in traditional C Wtraditional-conversion C ObjC Var(warn_traditional_conversion) Warning Warn of prototypes causing type conversions different from what would happen in the absence of prototype Wtrigraphs C ObjC C++ ObjC++ Warning Warn if trigraphs are encountered that might affect the meaning of the program Wundeclared-selector ObjC ObjC++ Var(warn_undeclared_selector) Warning Warn about @selector()s without previously declared methods Wundef C ObjC C++ ObjC++ Warning Warn if an undefined macro is used in an #if directive Wunknown-pragmas C ObjC C++ ObjC++ Warning Warn about unrecognized pragmas Wunsuffixed-float-constants C ObjC Var(warn_unsuffixed_float_constants) Warning Warn about unsuffixed float constants Wunused-macros C ObjC C++ ObjC++ Warning Warn about macros defined in the main file that are not used Wvariadic-macros C ObjC C++ ObjC++ Warning Do not warn about using variadic macros when -pedantic Wvla C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning Warn if a variable length array is used Wvolatile-register-var C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning Warn when a register variable is declared volatile Wwrite-strings C ObjC C++ ObjC++ Var(warn_write_strings) Warning In C++, nonzero means warn about deprecated conversion from string literals to `char *'. In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard. Wpointer-sign C ObjC Var(warn_pointer_sign) Init(-1) Warning Warn when a pointer differs in signedness in an assignment ansi C ObjC C++ ObjC++ A synonym for -std=c89 (for C) or -std=c++98 (for C++) d C ObjC C++ ObjC++ Joined ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD? faccess-control C++ ObjC++ Enforce class member access control semantics fall-virtual C++ ObjC++ falt-external-templates C++ ObjC++ Change when template instances are emitted fasm C ObjC C++ ObjC++ Recognize the \"asm\" keyword fbuiltin C ObjC C++ ObjC++ Recognize built-in functions fbuiltin- C ObjC C++ ObjC++ Joined fcheck-new C++ ObjC++ Check the return value of new fcond-mismatch C ObjC C++ ObjC++ Allow the arguments of the '?' operator to have different types fconserve-space C++ ObjC++ Reduce the size of object files fconstant-string-class= ObjC ObjC++ Joined -fconst-string-class= Use class for constant strings fdefault-inline C++ ObjC++ Inline member functions by default fdirectives-only C ObjC C++ ObjC++ Preprocess directives only. fdollars-in-identifiers C ObjC C++ ObjC++ Permit '$' as an identifier character felide-constructors C++ ObjC++ fenforce-eh-specs C++ ObjC++ Generate code to check exception specifications fenum-int-equiv C++ ObjC++ fexec-charset= C ObjC C++ ObjC++ Joined RejectNegative -fexec-charset= Convert all strings and character constants to character set fextended-identifiers C ObjC C++ ObjC++ Permit universal character names (\\u and \\U) in identifiers finput-charset= C ObjC C++ ObjC++ Joined RejectNegative -finput-charset= Specify the default character set for source files fexternal-templates C++ ObjC++ ffor-scope C++ ObjC++ Scope of for-init-statement variables is local to the loop ffreestanding C ObjC C++ ObjC++ Do not assume that standard C libraries and \"main\" exist fgnu-keywords C++ ObjC++ Recognize GNU-defined keywords fgnu-runtime ObjC ObjC++ Generate code for GNU runtime environment fgnu89-inline C ObjC Var(flag_gnu89_inline) Init(-1) Use traditional GNU semantics for inline functions fguiding-decls C++ ObjC++ fhandle-exceptions C++ ObjC++ Optimization fhonor-std C++ ObjC++ fhosted C ObjC Assume normal C execution environment fhuge-objects C++ ObjC++ Enable support for huge objects fimplement-inlines C++ ObjC++ Export functions even if they can be inlined fimplicit-inline-templates C++ ObjC++ Emit implicit instantiations of inline templates fimplicit-templates C++ ObjC++ Emit implicit instantiations of templates ffriend-injection C++ ObjC++ Var(flag_friend_injection) Inject friend functions into enclosing namespace flabels-ok C++ ObjC++ flax-vector-conversions C ObjC C++ ObjC++ Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types. fms-extensions C ObjC C++ ObjC++ Don't warn about uses of Microsoft extensions fname-mangling-version- C++ ObjC++ Joined fnew-abi C++ ObjC++ fnext-runtime ObjC ObjC++ Generate code for NeXT (Apple Mac OS X) runtime environment fnil-receivers ObjC ObjC++ Assume that receivers of Objective-C messages may be nil fnonansi-builtins C++ ObjC++ fnonnull-objects C++ ObjC++ ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods ; to initialize any non-POD ivars in Objective-C++ classes. fobjc-call-cxx-cdtors ObjC++ Var(flag_objc_call_cxx_cdtors) Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed fobjc-direct-dispatch ObjC ObjC++ Var(flag_objc_direct_dispatch) Allow fast jumps to the message dispatcher ; Nonzero means that we will allow new ObjC exception syntax (@throw, ; @try, etc.) in source code. fobjc-exceptions ObjC ObjC++ Var(flag_objc_exceptions) Enable Objective-C exception and synchronization syntax fobjc-gc ObjC ObjC++ Var(flag_objc_gc) Enable garbage collection (GC) in Objective-C/Objective-C++ programs ; Nonzero means that we generate NeXT setjmp based exceptions. fobjc-sjlj-exceptions ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1) Enable Objective-C setjmp exception handling runtime fopenmp C ObjC C++ ObjC++ Var(flag_openmp) Enable OpenMP (implies -frecursive in Fortran) foperator-names C++ ObjC++ Recognize C++ keywords like \"compl\" and \"xor\" foptional-diags C++ ObjC++ Enable optional diagnostics fpch-deps C ObjC C++ ObjC++ fpch-preprocess C ObjC C++ ObjC++ Look for and use PCH files even when preprocessing fpermissive C++ ObjC++ Downgrade conformance errors to warnings fpreprocessed C ObjC C++ ObjC++ Treat the input file as already preprocessed fpretty-templates C++ ObjC++ -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments freplace-objc-classes ObjC ObjC++ Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime frepo C++ ObjC++ Enable automatic template instantiation frtti C++ ObjC++ Optimization Generate run time type descriptor information fshort-double C ObjC C++ ObjC++ Optimization Use the same size for double as for float fshort-enums C ObjC C++ ObjC++ Optimization Use the narrowest integer type possible for enumeration types fshort-wchar C ObjC C++ ObjC++ Optimization Force the underlying type for \"wchar_t\" to be \"unsigned short\" fsigned-bitfields C ObjC C++ ObjC++ When \"signed\" or \"unsigned\" is not given make the bitfield signed fsigned-char C ObjC C++ ObjC++ Make \"char\" signed by default fsquangle C++ ObjC++ fstats C++ ObjC++ Display statistics accumulated during compilation fstrict-prototype C++ ObjC++ ftabstop= C ObjC C++ ObjC++ Joined RejectNegative UInteger -ftabstop= Distance between tab stops for column reporting ftemplate-depth- C++ ObjC++ Joined RejectNegative UInteger -ftemplate-depth- Specify maximum template instantiation depth fthis-is-variable C++ ObjC++ fthreadsafe-statics C++ ObjC++ Optimization -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics funsigned-bitfields C ObjC C++ ObjC++ When \"signed\" or \"unsigned\" is not given make the bitfield unsigned funsigned-char C ObjC C++ ObjC++ Make \"char\" unsigned by default fuse-cxa-atexit C++ ObjC++ Use __cxa_atexit to register destructors fuse-cxa-get-exception-ptr C++ ObjC++ Use __cxa_get_exception_ptr in exception handling fvisibility-inlines-hidden C++ ObjC++ Marks all inlined methods as having hidden visibility fvisibility-ms-compat C++ ObjC++ Var(flag_visibility_ms_compat) Changes visibility to match Microsoft Visual Studio by default fvtable-gc C++ ObjC++ Discard unused virtual functions fvtable-thunks C++ ObjC++ Implement vtables using thunks fweak C++ ObjC++ Emit common-like symbols as weak symbols fwide-exec-charset= C ObjC C++ ObjC++ Joined RejectNegative -fwide-exec-charset= Convert all wide strings and character constants to character set fworking-directory C ObjC C++ ObjC++ Generate a #line directive pointing at the current working directory fxref C++ ObjC++ Emit cross referencing information fzero-link ObjC ObjC++ Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode gen-decls ObjC ObjC++ Dump declarations to a .decl file femit-struct-debug-baseonly C ObjC C++ ObjC++ -femit-struct-debug-baseonly Aggressive reduced debug info for structs femit-struct-debug-reduced C ObjC C++ ObjC++ -femit-struct-debug-reduced Conservative reduced debug info for structs femit-struct-debug-detailed= C ObjC C++ ObjC++ Joined -femit-struct-debug-detailed= Detailed reduced debug info for structs idirafter C ObjC C++ ObjC++ Joined Separate -idirafter Add to the end of the system include path imacros C ObjC C++ ObjC++ Joined Separate -imacros Accept definition of macros in imultilib C ObjC C++ ObjC++ Joined Separate -imultilib Set to be the multilib include subdirectory include C ObjC C++ ObjC++ Joined Separate -include Include the contents of before other files iprefix C ObjC C++ ObjC++ Joined Separate -iprefix Specify as a prefix for next two options isysroot C ObjC C++ ObjC++ Joined Separate -isysroot Set to be the system root directory isystem C ObjC C++ ObjC++ Joined Separate -isystem Add to the start of the system include path iquote C ObjC C++ ObjC++ Joined Separate -iquote Add to the end of the quote include path iwithprefix C ObjC C++ ObjC++ Joined Separate -iwithprefix Add to the end of the system include path iwithprefixbefore C ObjC C++ ObjC++ Joined Separate -iwithprefixbefore Add to the end of the main include path lang-asm C Undocumented lang-objc C ObjC C++ ObjC++ Undocumented nostdinc C ObjC C++ ObjC++ Do not search standard system include directories (those specified with -isystem will still be used) nostdinc++ C++ ObjC++ Do not search standard system include directories for C++ o C ObjC C++ ObjC++ Joined Separate ; Documented in common.opt pedantic C ObjC C++ ObjC++ ; Documented in common.opt pedantic-errors C ObjC C++ ObjC++ ; Documented in common.opt print-objc-runtime-info ObjC ObjC++ Generate C header of platform-specific features print-pch-checksum C ObjC C++ ObjC++ Print a checksum of the executable for PCH validity checking, and stop remap C ObjC C++ ObjC++ Remap file names when including files std=c++98 C++ ObjC++ Conform to the ISO 1998 C++ standard std=c++0x C++ ObjC++ Conform to the ISO 1998 C++ standard, with extensions that are likely to become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the extensions enabled by this mode are experimental and may be removed in future releases of GCC. std=c89 C ObjC Conform to the ISO 1990 C standard std=c99 C ObjC Conform to the ISO 1999 C standard std=c9x C ObjC Deprecated in favor of -std=c99 std=gnu++98 C++ ObjC++ Conform to the ISO 1998 C++ standard with GNU extensions std=gnu++0x C++ ObjC++ Conform to the ISO 1998 C++ standard, with GNU extensions and extensions that are likely to become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the extensions enabled by this mode are experimental and may be removed in future releases of GCC. std=gnu89 C ObjC Conform to the ISO 1990 C standard with GNU extensions std=gnu99 C ObjC Conform to the ISO 1999 C standard with GNU extensions std=gnu9x C ObjC Deprecated in favor of -std=gnu99 std=iso9899:1990 C ObjC Conform to the ISO 1990 C standard std=iso9899:199409 C ObjC Conform to the ISO 1990 C standard as amended in 1994 std=iso9899:1999 C ObjC Conform to the ISO 1999 C standard std=iso9899:199x C ObjC Deprecated in favor of -std=iso9899:1999 traditional-cpp C ObjC C++ ObjC++ Enable traditional preprocessing trigraphs C ObjC C++ ObjC++ -trigraphs Support ISO C trigraphs undef C ObjC C++ ObjC++ Do not predefine system-specific and GCC-specific macros v Common C ObjC C++ ObjC++ Enable verbose output w C ObjC C++ ObjC++ ; Documented in common.opt ; This comment is to ensure we retain the blank line above.